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WO2010073849A1 - Système de pile à combustible comprenant une source de génération de chaleur pour chauffer un élément absorbant l'eau, et dispositif électronique le comprenant - Google Patents

Système de pile à combustible comprenant une source de génération de chaleur pour chauffer un élément absorbant l'eau, et dispositif électronique le comprenant Download PDF

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Publication number
WO2010073849A1
WO2010073849A1 PCT/JP2009/069344 JP2009069344W WO2010073849A1 WO 2010073849 A1 WO2010073849 A1 WO 2010073849A1 JP 2009069344 W JP2009069344 W JP 2009069344W WO 2010073849 A1 WO2010073849 A1 WO 2010073849A1
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WIPO (PCT)
Prior art keywords
fuel cell
water
absorbing member
cell system
layer
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Ceased
Application number
PCT/JP2009/069344
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English (en)
Japanese (ja)
Inventor
功太郎 齋藤
菰田　睦子
宏隆 水畑
武範 大西
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Sharp Corp
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Sharp Corp
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M8/00—Fuel cells; Manufacture thereof
    • H01M8/04—Auxiliary arrangements, e.g. for control of pressure or for circulation of fluids
    • H01M8/04082—Arrangements for control of reactant parameters, e.g. pressure or concentration
    • H01M8/04089—Arrangements for control of reactant parameters, e.g. pressure or concentration of gaseous reactants
    • H01M8/04119—Arrangements for control of reactant parameters, e.g. pressure or concentration of gaseous reactants with simultaneous supply or evacuation of electrolyte; Humidifying or dehumidifying
    • H01M8/04156—Arrangements for control of reactant parameters, e.g. pressure or concentration of gaseous reactants with simultaneous supply or evacuation of electrolyte; Humidifying or dehumidifying with product water removal
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M8/00—Fuel cells; Manufacture thereof
    • H01M8/06—Combination of fuel cells with means for production of reactants or for treatment of residues
    • H01M8/0693—Treatment of the electrolyte residue, e.g. reconcentrating
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M8/00—Fuel cells; Manufacture thereof
    • H01M8/24—Grouping of fuel cells, e.g. stacking of fuel cells
    • H01M8/249—Grouping of fuel cells, e.g. stacking of fuel cells comprising two or more groupings of fuel cells, e.g. modular assemblies
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M8/00—Fuel cells; Manufacture thereof
    • H01M8/10—Fuel cells with solid electrolytes
    • H01M8/1009—Fuel cells with solid electrolytes with one of the reactants being liquid, solid or liquid-charged
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/30—Hydrogen technology
    • Y02E60/50—Fuel cells

Definitions

  • the present invention relates to a fuel cell system and an electronic device including the same, and more particularly to a fuel cell system that is small in size and high in output and can prevent liquid leakage and an electronic device including the fuel cell system.
  • a fuel cell utilizes an electrochemical reaction in which fuel (for example, hydrogen, methanol, ethanol, hydrazine, formalin, formic acid, etc.) is oxidized at an anode electrode and oxygen in the air is reduced at a cathode electrode.
  • fuel for example, hydrogen, methanol, ethanol, hydrazine, formalin, formic acid, etc.
  • Such a fuel cell is a chemical cell that supplies electrons to a portable electronic device or the like, and high power generation efficiency can be obtained with a single power generation device.
  • a polymer electrolyte fuel cell (PEMFC) using a proton exchanged ion exchange membrane as an electrolyte membrane can achieve high power generation efficiency even at low temperature operation of 100 ° C. or less. Because of this, compared to fuel cells that operate at high temperatures, such as phosphoric acid fuel cells and solid oxide fuel cells, there is no need to apply heat from the outside, and there is no need for large-scale accessories. Therefore, it is expected to be put into practical use as a small power source.
  • PEMFC polymer electrolyte fuel cell
  • the fuel used for such a PEMFC is generally a hydrogen gas using a high-pressure gas cylinder, a mixed gas of hydrogen gas and carbon dioxide gas obtained by decomposing an organic liquid fuel with a reformer, or the like. .
  • a direct methanol fuel cell (DMFC: Direct Methanol Fuel Cell) needs to be equipped with a reformer to generate power by supplying a methanol aqueous solution to the anode electrode and extracting protons and electrons directly from the methanol aqueous solution. Absent. For this reason, the DMFC can be made smaller than the PEMFC. Therefore, DMFC is said to be a particularly effective fuel cell for practical use as a small power source.
  • DMFC uses an aqueous methanol solution that is liquid at atmospheric pressure as fuel. Therefore, a fuel having a high volumetric energy density can be handled with a small simple container without using a high-pressure gas cylinder, which is excellent in terms of safety when used as a small power source. Therefore, DMFC is attracting attention as an application to a small power source such as a portable electronic device, particularly as a secondary battery replacement application for a portable electronic device.
  • Patent Document 1 Japanese Patent Laid-Open No. 2002-15763
  • unit cells the fuel cells that constitute the DMFC.
  • a structure is disclosed in which a porous body for absorbing generated water is provided between two unit cells.
  • the porous body absorbs water generated by the unit battery, and the water evaporates from the porous body and is released outside the electronic device. For this reason, the liquid leak of the water produced
  • the DMFC having this structure is used for a long period of time, there is a problem that the generated water leaks again after the water absorption capacity of the porous body reaches a saturated state.
  • Patent Document 2 discloses a technique in which a water absorption layer is provided in one of the layers constituting a unit battery. As described above, the water absorption layer absorbs the water generated at the cathode electrode, thereby preventing leakage of the generated water. According to this method, the output of the fuel cell is less likely to decrease and liquid leakage is less likely to occur.
  • Patent Document 1 when the water absorption capacity of the water absorption layer reaches the limit, there still remains a problem that liquid leakage occurs.
  • Patent Document 3 discloses a structure in which a sheet-like water absorbing member is provided on one surface of a wall surface constituting a fuel cell. A fuel cell is disclosed. In this fuel cell, water generated by the unit cell is absorbed by a capillary action on one surface of the sheet-like water absorbing member. On the other hand, the other surface of the sheet-like water absorbing member has a structure for evaporating the absorbed water. According to such a structure, it is possible to further prevent leakage of produced water from the fuel cell, but particularly when the fuel cell is used for a long time, the liquid leakage occurs with a high probability.
  • the present invention has been made in order to solve the above-mentioned problems, and the object thereof is to increase the amount of water that can be released per unit time of the water absorbing member, thereby reducing the size and output.
  • the fuel cell system of the present invention includes a fuel cell stack including two or more unit cells each including a cathode electrode, an electrolyte membrane, and an anode electrode in this order, and an outside of the fuel cell stack so as to be in spatial communication with the cathode electrode.
  • a water-absorbing member that is disposed on the surface and absorbs water generated from the cathode electrode and a heat source that heats the water-absorbing member are provided.
  • a fuel cell layer in which two or more unit cells are arranged with a gap in the same plane and a spacer layer composed of two or more spacers arranged so as to intersect the unit cell are alternately arranged. It is preferable to be laminated.
  • the unit cell preferably includes a cathode electrode, an electrolyte membrane, an anode electrode, and an anode current collecting layer in this order.
  • a layer made of a water-absorbing material so as to cover a part of the surface of the spacer and to be in contact with the water-absorbing member.
  • the capillary force of the layer made of the water-absorbing material is preferably smaller than the capillary force of the water absorbing member.
  • the present invention is an electronic device having the above fuel cell system, and a heat source of the fuel cell system is an electronic component constituting the electronic device.
  • the present invention it is possible to provide a fuel cell system that is small in size, has high output, and is less likely to cause liquid leakage even when used for a long time.
  • the electronic device can be prevented from being damaged due to excessive temperature rise of the heat source of the electronic device, and an electronic device equipped with a highly reliable fuel cell system can be provided.
  • FIG. 1 is a diagram schematically showing a preferred example of the fuel cell system of the present invention.
  • the fuel cell system 10 of the present invention includes a fuel cell stack 11 including two or more unit cells 101 including a cathode electrode, an electrolyte membrane, and an anode electrode in this order, and an outside of the fuel cell stack 11.
  • the water-absorbing member 14 is disposed on the surface so as to spatially communicate with the cathode electrode and absorbs water generated at the cathode electrode, and a heat source 12 for heating the water-absorbing member 14.
  • spatially communicating means that the cathode electrode and the water absorbing member may be in contact with each other, or the cathode electrode and the water absorbing member may not be in contact with each other.
  • the space between the cathode electrode and the water absorbing member is filled with space (that is, there is no member between them) and is generated at the cathode electrode.
  • the water absorbing member exists in a positional relationship in which when the water falls due to gravity, the water directly falls on the water absorbing member without contacting any member other than the water absorbing member.
  • the cathode electrode and the water absorbing member are not in contact with each other, it is assumed that the water absorbing member is provided within a distance range in which water generated at the cathode electrode can be absorbed by the water absorbing member.
  • the heat generating source 12 raises the temperature of the water absorbing member 14
  • the evaporation rate of water contained in the water absorbing member 14 is increased.
  • the water absorption capability of the water absorbing member 14 is enhanced, and liquid leakage of the fuel cell stack can be prevented.
  • FIG. 1 shows an example of the fuel cell stack 11 including two unit cells 101
  • the effect of the present invention can be achieved even in the case of the fuel cell stack 11 including three or more unit cells 101. Needless to say, is shown.
  • a heat conducting member 13 that is disposed so as to be in contact with the water absorbing member 14 and the heat generating source 12 and conducts heat from the heat generating source 12 to the water absorbing member 14.
  • the heat conducting member 13 By providing the heat conducting member 13 in this way, the heat generated from the heat source 12 can be efficiently conducted to the water absorbing member 14. As a result, the evaporation rate of the water contained in the water absorbing member 14 can be increased, and liquid leakage from the fuel cell stack 11 can be prevented.
  • the fuel cell system of the present invention is arranged on a sheet-like heat conducting member 13, a sheet-like water absorbing member 14 laminated on the heat conducting member 13, and the water absorbing member 14. It is preferable that the fuel cell stack 11 is provided.
  • the fuel cell stack 11 having such a configuration can conduct the heat of the heat source 12 to the water absorbing member 14 through the heat conducting member 13. Thereby, the water contained in the water absorbing member 14 is further easily evaporated, and the water absorbing ability of the water absorbing member 14 can be enhanced.
  • the "sheet shape” here means a long shape, and can include any shape as long as the thickness is sufficiently small with respect to the front and back areas. .
  • the fuel cell stack 11 used in the fuel cell system 10 of the present invention includes two or more unit cells 101 including a cathode electrode, an electrolyte membrane, and an anode electrode in this order.
  • the water absorbing member 14 used in the fuel cell system of the present invention is provided to absorb the water generated at the cathode electrode of the unit cell 101 so as not to leak outside as shown in FIG. For this reason, in the fuel cell system 10 of the present invention, it is preferable to dispose the water absorbing member 14 on the outer surface of the fuel cell stack 11 so as to spatially communicate with the cathode electrode. Furthermore, from the viewpoint of efficiently absorbing the water generated by the unit cell 101 into the water absorbing member 14, the water absorbing member 14 is preferably provided downward in the gravity direction at the position where the fuel cell stack 11 is disposed.
  • the dew condensation water that has not been released into the atmosphere as water vapor moves downward due to gravity and moves to the water absorbing member 14. Water is absorbed.
  • the material used for the water absorbing member 14 is not particularly limited as long as it does not dissolve in water and liquid fuel, but any material such as an inorganic substance such as a metal or a polymer material can be used. It is preferable to use a porous body made of an organic substance. Examples of such a porous body include foams, fiber bundles, woven fibers, non-woven fibers, porous sintered bodies, and combinations of these materials.
  • a porous body of such a material water is absorbed and held in the pores of the porous body. Then, the porous body holding water is heated by a heat generation source, so that the efficiency of vaporizing water from the pores of the porous body to the atmosphere can be increased, and thus liquid leakage from the fuel cell stack can be achieved. Can be prevented.
  • the water absorbing member 14 When a porous body made of an inorganic substance such as a metal is used as the water absorbing member 14, it is preferable to combine an insulating material so as to block the conductivity of the porous body made of an inorganic substance such as a metal. By using such an insulating material, it is possible to prevent the cathode electrode and the anode electrode of the unit cell 101 from being short-circuited.
  • the insulating material combined with the water absorbing member 14 polyester, polycarbonate, polyethylene, acrylic, or the like is preferably used from the viewpoint of being hydrophilic and having chemical resistance.
  • porous body made of an organic substance such as a polymer material examples include natural fibers, polyester, polyethylene, polyurethane, acrylic, polyamide, polyolefin, polyacetal, polyvinyl, and polycarbonate. It is more preferable to use a fiber bundle, a woven fiber, or a non-woven fiber composed of one or a combination of two or more selected from the group consisting of styrene, polyether, and polyphenylene.
  • the heat source 12 used in the fuel cell system of the present invention is provided directly with the water absorbing member 14 or via a heat conducting member 13 described later in order to vaporize the water absorbed by the water absorbing member 14 to the atmosphere.
  • the heat source 12 itself becomes a high temperature.
  • Such a heat source 12 may be any one as long as it itself becomes a high temperature, and may be included in the fuel cell system in any form.
  • the heat source 12 is preferably an electronic component provided inside the casing of the electronic device.
  • the electronic component herein may be any electronic component that becomes high temperature due to the use of the electronic device, such as a central processing unit (CPU: Central Processing Unit) for electronic devices, a power amplifier, a wireless circuit, and the like. It is done.
  • CPU Central Processing Unit
  • an electronic component of an electronic device As a heat source, it is not necessary to separately provide the heat source 12 of the fuel cell system, and power used to drive the heat source 12 can be saved. For this reason, a fuel cell system can be reduced in size.
  • the heat of the electronic component of the electronic device meaning “the heat generation source 12” of the fuel cell system 10) is radiated to the atmosphere as the heat of vaporization of the water absorbing member 14, the excessive temperature rise of the electronic component provided in the electronic device This also has the effect of suppressing the operation of the electronic device from becoming unstable.
  • the fuel cell system of the present invention further includes a heat conducting member 13 that is disposed so as to contact the water absorbing member 14 and the heat source 12 and conducts heat from the heat source 12 to the water absorbing member 14. It is preferable.
  • a heat conducting member 13 heat from the heat source 12 can be efficiently conducted to the water absorbing member 14, moisture contained in the water absorbing member 14 can be efficiently vaporized, and the water absorbing member The water absorption capacity of 14 can be increased.
  • the material and shape of the heat conducting member 13 are not particularly limited as long as they have heat conductivity, but are preferably in the form of a sheet from the viewpoint of conducting heat to the water absorbing member 14 with high efficiency.
  • the heat conductive member 13 is a composite sheet including at least one selected from the group consisting of carbon black, metal, metal oxide, metal nitride, and metal carbide having high heat conductivity.
  • the heat conduction member 13 is a composite sheet comprising, for example, a filler containing a filler selected from carbon nanotubes, vapor grown carbon fibers (VGCF), etc., in an alloy containing aluminum, copper, or the like as a main component.
  • a composite sheet in which a matrix material made of at least one selected from the group consisting of silicone resin, high-density polyethylene, low-density polyethylene, and polypropylene is filled with a filler made of a material having high thermal conductivity. It is more preferable.
  • the joint surface between the water absorbing member 14 and the heat conducting member 13 is preferably located at the lower part of the fuel cell stack 11 in the gravitational direction.
  • the warm air vaporized at the joint surface between the water absorbing member 14 and the heat conducting member 13 is stacked from the lower part of the fuel cell stack 11. Ascending airflow occurs due to the chimney effect. By generating the upward airflow in this way, air can be taken in from the lower part of the fuel cell stack 11 without using power.
  • FIG. 3 is a schematic cross-sectional view showing a preferred example of the unit battery 101 of FIG.
  • the unit cell 101 is a unit constituting a fuel cell stack, and as shown in FIG. 3, a membrane electrode assembly 106 including an anode electrode 103, an electrolyte membrane 102, and a cathode electrode 104 in this order.
  • MEA Membrane Electrode Assembly
  • the unit battery 101 may include other components in addition to the membrane electrode assembly 106 as necessary for the purpose of imparting a power generation function or other purposes.
  • the unit battery 101 may include an anode current collecting layer 105, a cathode current collecting layer, and the like. A layer (not shown), a separator (not shown), or the like may be provided.
  • the unit cell 101 constituting the fuel cell layer of the fuel cell stack 11 of the present invention includes the anode current collecting layer 105
  • the unit cell 101 includes the cathode electrode 104, the electrolyte membrane 102, and the like, as shown in FIG. It is preferable to include the anode electrode 103 and the anode current collecting layer 105 in this order. By including the anode current collecting layer 105 in this manner, electrons generated at the anode electrode 103 can be exchanged efficiently.
  • the anode current collecting layer 105 when the anode current collecting layer 105 is provided in the unit cell 101, it is preferable that the anode current collecting layer includes a fuel flow path 107 which is a space for fuel transportation as shown in FIG.
  • the aqueous methanol solution is supplied to the anode electrode 103 through the fuel flow path 107, and CH 3 OH + H 2 O ⁇ CO 2 + 6H + + 6e ⁇ at the anode electrode 103. Reacts to generate hydrogen ions and electrons.
  • the hydrogen ions generated here move to the cathode electrode 104 through the electrolyte membrane 102.
  • air is supplied from the atmosphere as an oxidant to the cathode electrode 104 and reacts with O 2 + 4H + + 4e ⁇ ⁇ 2H 2 O at the cathode electrode 104 to generate water.
  • electric energy can be obtained from the unit cell 101.
  • gaseous fuel or liquid fuel may be used as long as electric power can be obtained by electrolysis.
  • gaseous fuel include hydrogen, DME, methane, butane, and ammonia.
  • liquid fuel include alcohols such as methanol and ethanol, acetals such as dimethoxymethane, carboxylic acids such as formic acid, esters such as methyl formate, and hydrazine.
  • the above-mentioned liquid fuel mentions the fuel which is a liquid at normal temperature, you may vaporize liquid fuel and may supply a gaseous phase.
  • the gas fuel and liquid fuel described above are not limited to one type, and may be a mixture of two or more types. From the viewpoint of energy density per volume, it is preferable to use methanol.
  • ⁇ Oxidizing agent> As the oxidant supplied to the fuel cell stack of the present invention, it is preferable to use oxygen, hydrogen peroxide, and nitric acid. From the viewpoint of the cost of the oxidizing agent, it is more preferable to use oxygen in the air.
  • oxygen in the air.
  • the electrolyte membrane 102 constituting the unit cell 101 conducts protons generated at the anode electrode 103 and transmits the protons to the cathode electrode 104, and any material having electrical insulating properties can be used. Any known material can be used.
  • the electrolyte membrane 102 can be formed of, for example, a polymer film, an inorganic film, or a composite film.
  • polymer membranes used for the electrolyte membrane 102 include perfluorosulfonic acid electrolyte membranes (Nafion (NAFION (registered trademark): manufactured by DuPont)), Dow membranes (manufactured by Dow Chemical), and Aciplex (ACIPLEX (registered). (Trademark): manufactured by Asahi Kasei Co., Ltd., Flemion (registered trademark): manufactured by Asahi Glass Co., Ltd.), and hydrocarbon electrolyte membranes such as polystyrene sulfonic acid and sulfonated polyether ether ketone.
  • Examples of the inorganic film used for the electrolyte membrane 102 include phosphate glass, cesium hydrogen sulfate, polytungstophosphoric acid, ammonium polyphosphate, and the like.
  • Examples of the composite membrane used for the electrolyte membrane 102 include Gore Select membrane (Gore Select (registered trademark): manufactured by Japan Gore-Tex Co., Ltd.).
  • the fuel cell stack (or unit cell 101) can cope with temperatures near 100 ° C. or higher, it is preferable to use a material for the electrolyte membrane 102 having high ionic conductivity even when the water content is low.
  • the material for the electrolyte membrane 102 include sulfonated polyimide, 2-acrylamido-2-methylpropanesulfonic acid (AMPS), sulfonated polybenzimidazole, and phosphonated polybenzimidazole. It is preferable to use cesium hydrogen sulfate, ammonium polyphosphate, ionic liquid (room temperature molten salt) or the like as a film.
  • Such an electrolyte membrane 102 preferably has a proton conductivity of 10 ⁇ 5 S / cm or more, and has a proton conductivity of 10 like a polymer electrolyte membrane such as a perfluorosulfonic acid polymer or a hydrocarbon polymer. It is more preferable to use a material of ⁇ 3 S / cm or more.
  • the anode electrode 103 of the unit cell 101 used in the fuel cell system of the present invention includes at least an anode catalyst layer (not shown) including an anode catalyst that promotes fuel oxidation. Then, the fuel causes an oxidation reaction on the anode catalyst to generate protons and electrons.
  • the anode electrode 103 preferably has a structure in which an anode porous substrate (not shown) is laminated on the anode current collecting layer 105 side (the side opposite to the electrolyte membrane 102) separately from the anode catalyst layer.
  • the cathode electrode 104 of the unit cell 101 used in the fuel cell system of the present invention includes at least a cathode catalyst layer (not shown) including a cathode catalyst that promotes reduction of the oxidant. Then, the oxidant takes in protons and electrons on the cathode catalyst to generate a reduction reaction, thereby generating water.
  • the cathode electrode 104 preferably has a structure in which a cathode porous substrate (not shown) is further laminated on the side opposite to the electrolyte membrane 102 in addition to the cathode catalyst layer.
  • the anode catalyst layer preferably includes at least an anode catalyst that promotes oxidation of the fuel, and further includes an anode support and an anode electrolyte.
  • the cathode catalyst layer preferably includes at least a cathode catalyst that promotes a reaction rate for generating water from oxygen, protons, and electrons, and further includes a cathode support and a cathode electrolyte.
  • each of the anode catalyst layer and the cathode catalyst layer is preferably 0.1 ⁇ m or more and 0.2 mm or less. If the thickness of the anode catalyst layer and the cathode catalyst layer is less than 0.1 ⁇ m, the anode catalyst layer and the cathode catalyst layer may not be able to carry a catalyst amount sufficient to improve the output of the fuel cell stack (or unit cell). If it exceeds 0.2 mm, the resistance of proton conduction and the resistance of electron conduction may increase, or the diffusion resistance of liquid fuel or oxidant may increase.
  • Anode catalyst and cathode catalyst The anode catalyst has a function of accelerating the reaction rate of producing protons and electrons from methanol and water when using an aqueous methanol solution as a fuel.
  • the cathode catalyst has a function of accelerating the reaction rate of the reaction for generating water from oxygen, protons and electrons.
  • the anode catalyst and the cathode catalyst are not necessarily limited to the same type, and different types of materials can be used.
  • Examples of such anode catalyst and cathode catalyst include noble metals such as Pt, Ru, Au, Ag, Rh, Pd, Os, Ir, Ni, V, Ti, Co, Mo, Fe, Cu, Zn, Sn, W, and the like.
  • Base metals such as Zr, oxides of these noble metals or base metals, carbides and carbonitrides, or one or a combination of two or more materials selected from the group consisting of carbon can be used as the catalyst.
  • the anode carrier has a function of conducting electrons generated at the anode electrode 103 to the anode porous substrate.
  • the cathode carrier has a function of conducting electrons from the cathode porous substrate to the cathode catalyst layer.
  • any material may be used for the anode carrier and the cathode carrier as long as they have electrical conductivity. However, it is preferable to use a carbon-based material having high electrical conductivity, and a carbon-based material having high electrical conductivity. Examples of the material include acetylene black, ketjen black (registered trademark), amorphous carbon, carbon nanotube, and carbon nanohorn.
  • noble metals such as Pt, Ru, Au, Ag, Rh, Pd, Os, Ir, Ni, V, Ti, Co, Mo, Fe, Cu, Zn, Sn, W
  • Base materials such as Zr, oxides of these noble metals or base metals, carbides, nitrides, and carbon nitrides may be used as the support.
  • anode carrier and the cathode carrier may be a material imparted with proton conductivity.
  • Examples of the material imparted with proton conductivity in this way include sulfated zirconia and zirconium phosphate.
  • the surface of the anode carrier is preferably hydrophilic.
  • the fuel methanol aqueous solution
  • examples of the method for hydrophilizing the surface of the anode carrier include a method of modifying the surface of the anode carrier with a hydrophilic functional group such as a carboxyl group or a hydroxyl group.
  • Examples of the method for hydrophilizing the surface of the anode carrier include surface modification by graft polymerization of the carbon surface, surface modification with a silane coupling agent, and the like. Since both the anode catalyst and the cathode catalyst have electron conductivity, the anode carrier and the cathode carrier need not be provided.
  • the anode electrolyte has a function of conducting protons generated at the anode electrode 103 to the electrolyte membrane 102.
  • the cathode electrolyte has a function of conducting protons permeated from the electrolyte membrane 102 to the vicinity of the cathode catalyst layer.
  • the anode electrolyte and the cathode electrolyte are not particularly limited as long as they are materials having proton conductivity and electrical insulation, and any materials can be used.
  • the anode electrolyte and cathode electrolyte are preferably solids or gels that are not dissolved by a fuel such as methanol.
  • Such an anode electrolyte and cathode electrolyte are preferably organic polymers having strong acid groups such as sulfonic acid and phosphoric acid groups and weak acid groups such as carboxyl groups.
  • perfluorocarbon Nafion (registered trademark) (DuPont) Co.)
  • carboxyl group-containing perfluorocarbon Femion (registered trademark) (manufactured by Asahi Kasei Corporation)
  • polystyrene sulfonic acid copolymer polystyrene sulfonic acid copolymer
  • polyvinyl sulfonic acid copolymer polyvinyl sulfonic acid copolymer
  • ionic liquid room temperature molten salt
  • sulfonation examples thereof include imide and AMPS.
  • the anode porous substrate forms a void that allows methanol and water to be supplied to the anode catalyst layer, and has a function of conducting electrons from the anode carrier to the anode current collecting layer 105.
  • the cathode porous substrate forms a void that allows oxygen in the atmosphere to be supplied to the cathode catalyst layer and allows the generated water to be efficiently discharged to the outside, and from the cathode carrier to external wiring (not shown). ) Has the function of conducting electrons.
  • the anode porous substrate and the cathode porous substrate are preferably made of a conductive material.
  • a conductive material for example, carbon paper, carbon cloth, metal foam, metal sintered body, metal fiber nonwoven fabric, and the like can be used.
  • a metal used for a metal foam, a metal sintered body, and a nonwoven fabric of metal fiber noble metals such as Pt, Ru, Au, Ag, Rh, Pd, Os, Ir, Ni, V, Ti, Co
  • base metals such as Mo, Fe, Cu, Zn, Sn, W, and Zr, and materials containing one or more of these noble metals, base metal oxides, carbides, nitrides, and carbonitrides. .
  • the anode porous substrate is preferably disposed on the anode current collecting layer 105 side (the side opposite to the electrolyte membrane 102 side) of the anode electrode 103. Further, the cathode porous substrate is preferably disposed outside the unit cell in the cathode electrode 104 (on the side opposite to the electrolyte membrane 102 side).
  • the anode porous substrate and the cathode porous substrate are not necessarily provided. That is, for example, the anode catalyst layer may be formed directly on the electrolyte membrane 102 such that the anode catalyst layer exchanges electrons with the anode current collecting layer, or the cathode catalyst layer exchanges electrons with the external wiring. In addition, the cathode catalyst layer may be formed directly on the electrolyte membrane 102.
  • the unit cell 101 constituting the fuel cell layer preferably further includes an anode current collecting layer 105 having a function of transferring electrons generated in the anode electrode 103.
  • Such an anode current collecting layer 105 preferably has a fuel flow path 107 in which one or two or more grooves are formed on the surface of the front and back in contact with the anode electrode 103.
  • the shape of the fuel flow path 107 provided in the anode current collecting layer 105 is not particularly limited, and any shape can be used.
  • the shape of the fuel flow path 107 is preferably determined in consideration of the electrical resistance of the anode current collecting layer 105, the contact area between the anode current collecting layer 105 and the anode electrode 103, and the like.
  • the fuel channel 107 may have a quadrangular cross-sectional shape with respect to the direction in which the fuel flows in the fuel channel 107.
  • section relative to the direction through which fuel flows in the fuel passage 107 is a square shape, it is preferred that the rectangular area is 0.01 mm 2 or more 1 mm 2 or less. If this area is less than 0.01 mm 2 , there is a problem that the pressure loss for flowing the liquid increases, so that the fuel supply device becomes large. If it exceeds 1 mm 2 , the fuel cell stack becomes large. .
  • the width of the fuel flow path may be 0.1 mm or more and 1 mm or less. preferable. If the width of the fuel flow path is less than 0.1 mm, there is a problem in that the efficiency of fuel supply from the fuel flow path to the anode electrode 103 decreases. If the width exceeds 1 mm, the anode current collector layer in contact with the anode electrode Since the edge width becomes short, the structural stability becomes poor.
  • the area of the surface in contact with the anode current collecting layer 105 of both the front and back surfaces of the anode electrode 103 is in contact with the anode current collecting layer 105. Note that, even when another layer is interposed between the anode electrode 103 and the anode current collecting layer 105 and the anode electrode 103 and the anode current collecting layer 105 are not in contact with each other, the above-described area relationship is the same. . When this area is less than 20%, there is a problem that ohmic resistance increases due to a decrease in the contact area between the anode current collecting layer 105 and the anode electrode 103.
  • the material used for the anode current collecting layer 105 may be any material as long as it exhibits conductivity.
  • the material used for the anode current collecting layer 105 is preferably a material having a small specific resistance, and includes at least one element selected from the group consisting of Pt, Ti, Au, Ag, Cu, Ni, and W. It is more preferable. By using such a material for the anode current collecting layer 105, voltage drop due to the resistance of the anode current collecting layer 105 can be reduced, and higher power generation characteristics can be obtained.
  • anode current collecting layer 105 when using a metal that is easily corroded in an acidic atmosphere such as Cu, Ag, or Zn, a noble metal or metal material having corrosion resistance such as Au, Pt, or Pd is used. It is preferable to coat the surface with a conductive polymer, a conductive nitride, a conductive carbide, a conductive carbonitride, a conductive oxide, or the like. By coating the surface in this way, corrosion of the surface of the anode current collecting layer 105 can be prevented, and the life of the unit cell and the fuel cell stack using the unit cell can be extended.
  • FIG. 2 is a diagram schematically showing a preferred example of the fuel cell system of the present invention.
  • the fuel cell system of the present embodiment includes a fuel cell stack including two or more unit cells 201 and an outer surface of the fuel cell stack so as to be in spatial communication with the cathode electrode of the unit cell 201.
  • the water absorbing member 24 that absorbs water generated from the cathode electrode, the heat generating source 22 that heats the water absorbing member 24, the water absorbing member 24, and the heat generating source 22 are disposed in contact with each other.
  • a heat conducting member 23 that conducts heat to the water absorbing member 24 is provided.
  • the fuel cell stack used in the fuel cell system 20 of the present invention includes a fuel cell layer 21 in which one or two or more unit cells 201 are arranged with a gap in the same plane. It is preferable that the spacer layer 26 composed of one or two or more spacers 206 arranged so as to intersect with the unit battery 201 is alternately laminated.
  • the spacer layer 26 is formed between the two fuel cell layers 21.
  • the present invention is not limited to this mode, and the fuel cell layer 21 and the spacer layer are further limited. 26 are alternately stacked, they are included in the scope of the present invention, and the maximum number of stacked layers is not particularly limited.
  • the spacer 206 between the fuel cell layers 21 By providing the spacer 206 between the fuel cell layers 21 in this way, the gap 214 provided in the same plane of the fuel cell layer 21 and the space portion 210 between the fuel cell layers 21 communicate three-dimensionally.
  • the diffusibility of air in the fuel cell stack can be improved. That is, the air that has entered the fuel cell stack is naturally convected through the communicating gap 214 and the space portion 210, and air is easily supplied to the cathode electrode of the unit cell 201 included in the fuel cell stack.
  • the effect of promoting the evaporation of water contained in the water absorbing member 24 is also obtained by improving the air diffusibility.
  • the structure of the fuel cell stack including the spacer layer 26 including the four spacers 206 disposed is shown, both the number of unit cells and the number of spacers in FIG. It is not limited.
  • the unit cell 201 preferably has a strip shape having a long side and a short side from the viewpoint of ensuring the thickness of the gap 214 uniformly. It is preferable that it is a strip shape which has the length of at least one side. If the unit battery 201 has a rectangular column shape, the cross-sectional shape of the unit battery 201 is not particularly limited, and may be, for example, an ellipse or a square.
  • the fuel cell layer 21 of the fuel cell stack is arranged such that the unit cells 201 are provided with a gap 214 in the same plane and the long sides face each other.
  • Each unit cell 201 has a cathode electrode and an anode electrode arranged in the same direction. That is, the cathode electrode of the unit cell 201 included in one fuel cell layer 21 of the adjacent fuel cell layers 21 and the anode electrode included in the other fuel cell layer 21 are arranged to face each other.
  • dew condensation water generated on the surface of the cathode of the unit cell 201 falls as a droplet in the direction of gravity and is held by the water absorbing member 24 or is connected to the wall surface of the spacer 206. Accordingly, the water absorbing member 24 absorbs water.
  • the spacer layer 26 is included in the cathode electrode of the unit cell 201 included in one fuel cell layer 21 of the fuel cell layers 21 arranged in contact with the front and back surfaces thereof, and in the other fuel cell layer 21. It arrange
  • the positional relationship between the spacer layer 26 and the water absorbing member 24 is not particularly limited as long as the space 210 is formed in the fuel cell layer 21, and the spacer layer 26 may be provided at any position. It is preferable that the members 24 are arranged so as to be orthogonal to each other. By disposing in this way, the condensed water generated at the cathode electrode of the unit cell 201 can efficiently absorb water into the water absorbing member 14 that covers the wall surface of the spacer 206.
  • the spacer layer 26 and the water absorbing member 24 do not necessarily have to be in contact with each other, and the effect of the present invention is exhibited even if the spacer layer 26 is provided separately from the water absorbing member 24.
  • the spacer layer 26 is formed by arranging one or more spacers 206 in the same plane.
  • the number of the spacers 206 is not particularly limited as long as the spacer layer 26 can secure the space 210 between the fuel cell layers 21.
  • the spacer layer 26 is configured by one or two or more spacers 206. be able to. However, from the viewpoint that the gap 214 of the unit battery 201 can be communicated three-dimensionally, the spacer layer 26 is preferably composed of two or more spacers 206.
  • the spacers 206 are arranged at intervals as shown in FIG.
  • the gap 214 provided in the same plane and the space 210 between the fuel cell layers 21 communicate three-dimensionally, and air diffusion in the fuel cell stack.
  • the air located in the gap 214 and the space part 210 in the fuel cell stack is naturally convected or diffused through the communicating gap 214 and the space part 210 and is easily supplied to the inside of the fuel cell stack.
  • oxygen in the atmosphere can be supplied to the cathode electrode of the unit cell 201 of the fuel cell layer 21 through the space portion 210.
  • the structure of the fuel cell stack as shown in FIG. 2 allows the air located in the space 210 and the gap 214 in the fuel cell stack to be warmed by the heat generated by the power generation of the unit cell. As a result, thermal convection is generated in the direction opposite to the direction of gravity in the communicating gap 214 and space 210 and released to the outside. In addition, an effect of promoting the reduction reaction at the cathode electrode by supplying air so as to be efficiently sucked from the side surface and the lower surface of the fuel cell stack is also obtained.
  • the spacer 206 forming the spacer layer 26 is preferably a porous one having openings for air circulation.
  • air circulation in the fuel cell stack can be activated and air can be easily taken into the fuel cell stack.
  • the spacer 206 is porous, the effect of increasing the water evaporation rate of the water absorbing member 24 can also be obtained.
  • the porous spacer 206 is preferably water-repellent.
  • the water-repellent spacer 206 it is possible to prevent the air circulation opening in the spacer 206 from being buried in water, and the effect of using a porous spacer 206 can be maintained. At this time, it is preferable that the spacer 206 does not touch the water absorbing member 24.
  • the spacer 206 disposed in the spacer layer 26 is preferably integrated with the anode current collecting layer adjacent to the spacer 206.
  • Examples of a method for integrating the spacer 206 and the anode current collecting layer include adhesion using an adhesive such as a thermosetting resin, diffusion bonding, ultrasonic bonding, and laser welding.
  • integration refers to a state in which separation does not occur even if pressure is not applied from the outside. Specifically, it means a state in which the anode current collecting layer and the spacer 206 are bonded together by a chemical bond, an anchor effect, an adhesive force, or the like.
  • Any spacer 206 can be used without any particular limitation as long as it maintains a strength that can secure the space 210 between the fuel cell layers even when an external force is applied to the fuel cell stack. It is preferable to use a conductive material. By using a conductive material, the anode current collecting layer of the unit cell of one fuel cell layer and the other fuel cell layer of two adjacent fuel cell layers without providing any other external wiring The unit cells can be connected in series by being electrically connected to the cathode electrode. Thereby, a fuel cell stack can be reduced in size.
  • the material used for the spacer 206 is preferably the same material as the anode current collecting layer.
  • Such materials include carbon materials, conductive polymers, noble metals such as Au, Pt and Pd, metals such as Ti, Ta, W, Nb, Ni, Al, Cr, Ag, Cu, Zn and Su, Si And nitrides, carbides, carbonitrides thereof, and the like, and alloys such as stainless steel, Cu—Cr, Ni—Cr, and Ti—Pt.
  • the material used for the spacer 206 is preferably a material having a small specific resistance from the viewpoint of reducing voltage drop due to the resistance of the spacer and obtaining higher power generation characteristics. More preferably, it contains at least one element selected from the group consisting of Pt, Ti, Au, Ag, Cu, Ni, and W.
  • a material used for the spacer 206 when using a metal which is easily corroded in an acidic atmosphere such as Cu, Ag, Zn, etc., a noble metal and metal material having corrosion resistance such as Au, Pt, Pd, etc., conductivity
  • a polymer conductive nitride, conductive carbide, conductive carbonitride, conductive oxide or the like
  • corrosion of the spacer 206 can be prevented. Thereby, the lifetime of the unit cell 201 and the fuel cell stack using the unit cell 201 can be extended.
  • the shape of the spacer 206 is not particularly limited as long as the space 210 for supplying oxygen can be secured between the stacked fuel cell layers, and any shape can be used. From the viewpoint of ensuring a uniform thickness of the space portion 210 and increasing the volume of the space portion 210, the spacer 206 is preferably a strip shape having a long side and a short side. A strip shape having a length of at least one side of the laminated surface is preferable. If the shape of the spacer 206 is a rectangular column, the cross-sectional shape of the spacer 206 is not particularly limited, and may be, for example, an ellipse or a square.
  • the shape of the spacer 206 is preferably a rectangular parallelepiped shape.
  • the front and back fuel cell layers adjacent to the spacer 206 can be brought into contact with each other, so that the electrical contact resistance can be reduced.
  • the width of the spacer 206 is preferably 0.5 mm or more and 5 mm or less. If the spacer width is less than 0.5 mm, the structural strength of the fuel cell stack may be insufficient, and if it exceeds 5 mm, oxygen may not be sufficiently supplied to the cathode electrode of the unit cell 201.
  • the thickness of the spacer 206 is preferably 0.1 mm or more and 5 mm or less, and more preferably 0.2 mm or more and 1 mm or less. If the thickness of the spacer is less than 0.1 mm, it is difficult to supply oxygen into the space 210 formed by the spacer (the cathode electrode of the unit cell 201). If the thickness exceeds 5 mm, the fuel cell stack becomes large. There is a tendency to become.
  • the number of the spacers 206 arranged between the two adjacent fuel cell layers 21 is not particularly limited as long as the space 210 between the two fuel cell layers 21 can be secured. You can select the quantity. From the viewpoint of stably securing the space 210 between the fuel cell layers 21 even when an external force is applied to the fuel cell stack, the spacer layer 26 composed of two or more spacers 206 is preferable.
  • FIG. 4 is a diagram schematically showing another preferred example of the fuel cell system of the present invention.
  • the fuel cell system 30 of the present invention may include a water absorbing member 34 on the side surface as well as the bottom surface of the fuel cell stack.
  • a heat source 32 is provided so as to be in contact with a part of these water absorbing members 34.
  • FIG. 4 shows a structure in which the water absorbing members 34 are provided on the bottom and side surfaces of the fuel cell stack and the water absorbing members 34 are joined to each other, but only when the water absorbing members 34 are joined together in this way.
  • the present invention is not limited, and the case where they are provided separately is also included in the scope of the present invention. However, when each water absorbing member 34 is provided separately, the effect of the present invention cannot be sufficiently obtained unless a heat generation source is provided so as to be in contact with each water absorbing member.
  • FIG. 4 shows a structure in which three fuel cell layers 31 and two spacer layers are alternately stacked.
  • Each fuel cell layer 31 includes four unit cells 301, and each spacer layer has three layers.
  • a fuel cell system 30 including one spacer is shown, the present invention is not limited to this structure.
  • the dew condensation water generated at the cathode electrode of the unit cell 301 is absorbed by the water absorbing member 34 provided at the lower part of the fuel cell stack by gravity, or a spacer 306 is used. It is either absorbed by the water absorbing member 34 provided on the side surface of the fuel cell stack.
  • a layer 35 made of a water-absorbing material that covers a part of the surface of the spacer 306 and is in contact with the water-absorbing member 34 (hereinafter referred to as “produced water Part ”).
  • the contact between the layer 35 made of the water-absorbing material and the water-absorbing member 34 means that a part of the layer made of the water-absorbing material is in contact with the water-absorbing member 34, as shown in FIG.
  • the end portion of the layer made of may be in contact with the water absorbing member 34.
  • the layer 35 made of a water-absorbing material is preferably provided on the surface of the spacer 306 that is not in contact with the unit cell 301 from the viewpoint of ensuring electrical conductivity between the spacer 306 and the unit cell 301. Further, from the viewpoint of facilitating delivery of generated water from the layer 35 made of the water absorbing material to the water absorbing member 34, the capillary force of the layer 35 made of the water absorbing material may be smaller than the capillary force of the water absorbing member 34. preferable.
  • the material used for the layer 35 made of such a water-absorbing material it is necessary to use a material that does not dissolve in water and liquid fuel, like the material used for the water-absorbing member 34.
  • a porous body made of an inorganic substance such as a metal or an organic substance such as a polymer material is preferably used. Examples of such a porous body include foams, fiber bundles, woven fibers, non-woven fibers, porous sintered bodies, and combinations of these materials.
  • a porous body made of an organic substance such as a polymer material is used for the layer 35 made of a water-absorbing material, for example, natural fiber, polyester, polyethylene, polyurethane, acrylic, polyamide, polyolefin, polyacetal, polyvinyl, polycarbonate, poly It is more preferable to use a fiber bundle, woven fiber, or non-woven fiber composed of one or a combination of two or more selected from ether, polyphenylene, and the like.
  • FIG. 5 is a diagram schematically illustrating a preferred example of an electronic device equipped with the fuel cell system according to the first embodiment. 5 schematically illustrates a mobile phone, FIG. 5A is a rear view of the mobile phone, and FIG. 5B is a side view of the mobile phone.
  • the electronic device 110 on which the fuel cell system 10 of the present invention is mounted includes a fuel cell stack 11, a water absorbing member 14, a heat generating source 12, and a heat conducting member 13.
  • the heat source 12 is in contact with the heat source 12 via the heat conducting member 13.
  • the openings for supplying air to the fuel cell stack 11 are provided on the three side surfaces and the upper surface that do not face the casing of the electronic device 110 in FIG.
  • the water generated by the chemical reaction at the cathode electrode of the unit cell 101 is held by the water absorbing member 14, and the water absorbed by the water absorbing member 14 is vaporized by the heat of the heat generating source 12, and the fuel cell stack. 11 is discharged to the outside, the water absorbing member 14 is saturated and the occurrence of liquid leakage can be prevented.
  • the heat source 12 used in the electronic device of the present invention is an electronic component essential for use of the electronic device. As shown in FIG. 5, by using an electronic component essential for using the electronic device 110 as the heat source 12 of the fuel cell system, the water absorbed by the water absorbing member 14 can be efficiently vaporized. Moreover, since it is possible to prevent an excessive temperature rise of the electronic component of the electronic device 110, the driving of the electronic device 110 can be stabilized.
  • FIG. 6 is a diagram schematically showing a preferred example of an electronic device equipped with the fuel cell system of the third embodiment.
  • the electronic device in FIG. 6 schematically represents a notebook personal computer, and includes the fuel cell system 30 of the third embodiment.
  • the electronic device 310 includes a fuel cell stack, a heat generation source 32, and a heat conduction member 33, and a water absorbing member 34 of the fuel cell system is in contact with the heat generation source 32 through the heat conduction member 33.
  • the water produced by the chemical reaction of the unit potential in the fuel cell stack is held by the water absorbing member 34 provided on the bottom or side surface of the fuel cell stack. And since the water
  • the heat source 32 of the fuel cell system shown in FIG. 6 is preferably an electronic component essential for the use of electronic equipment.
  • a CPU used for driving a notebook personal computer is used as the heat source 32.
  • the electronic component essential for the use of the electronic device 310 as the heat generation source 32 of the fuel cell system, the water absorbed by the water absorbing member 34 can be efficiently vaporized.
  • two of the six surfaces of the fuel cell stack are open as air intake supply openings, and the water absorbing member 34 located on the side surface of the fuel cell stack is an air intake supply opening. It is provided on one side of the fuel cell stack.
  • a fuel cell stack having the same structure as the fuel cell stack 11 having the structure shown in FIG. 1 was produced.
  • a method for producing the fuel cell stack of Example 1 will be described.
  • an electrolyte membrane having a width of 25 mm ⁇ a length of 25 mm and a thickness of about 175 ⁇ m (trade name: Nafion (registered trademark) 117 (manufactured by DuPont) ) was prepared.
  • catalyst-carrying carbon particles (trade name: TEC66E50 (Tanaka Kikinzoku Kogyo Co., Ltd.) consisting of Pt and Ru particles having a Pt-carrying amount of 32.5% by mass and a Ru-carrying amount of 16.9% by mass and carbon particles.
  • An anode catalyst paste was prepared by placing in a Teflon (registered trademark) container at a ratio of 6: 100 and mixing at 500 rpm for 50 minutes using a stirrer.
  • the catalyst support carbon particles (trade name: TEC10E50E (manufactured by Tanaka Kikinzoku Kogyo Co., Ltd.)) composed of Pt particles having a Pt support amount of 46.8% by mass and carbon particles were used.
  • the cathode catalyst paste was prepared by the method.
  • a carbon paper (trade name: 25BC (manufactured by SGL Carbon Japan Co., Ltd.)) having an outer diameter of 23 mm ⁇ 23 mm as a base of the anode electrode and water-repellent treatment with a layer composed of a fluorine-based resin and carbon particles on one side was used. Then, a square opening having a width of 23 mm and a length of 23 mm is formed on the surface of the carbon paper that has been subjected to the water-repellent treatment so that the amount of the catalyst supported on the anode catalyst paste prepared above is 2 mg / cm 2. Screen printing was performed on the entire surface of the carbon paper on which the microporous layer was formed. Thereafter, the screen-printed anode catalyst paste was dried at room temperature to produce an anode electrode having an anode catalyst layer having a thickness of about 50 ⁇ m.
  • the cathode catalyst paste obtained above was screen-printed using the same carbon paper as described above to form a cathode electrode having a cathode catalyst layer having a thickness of about 50 ⁇ m.
  • an electrolyte membrane, an anode electrode, and a cathode electrode constituting the unit cell were produced.
  • the anode electrode 103 and the cathode electrode 104 overlap at the center of the electrolyte membrane 102 with the electrolyte membrane 102 obtained above sandwiched therebetween, and the anode catalyst layer and the cathode catalyst layer are connected to the electrolyte membrane 102.
  • the anode electrode 103, the electrolyte membrane 102, and the cathode electrode 104 are laminated in this order so as to be in contact with each other, and this is a 100 mm ⁇ 100 mm frame-shaped Teflon having a 50 mm ⁇ 50 mm square through hole (thickness 0.30 mm). (Registered trademark) installed in the through hole of the spacer.
  • thermocompression bonding was performed at 130 ° C. and 5 kgf / cm 2 for 2 minutes in the thickness direction of the stainless steel plate, and anode electrode 103, electrolyte membrane 102, and cathode electrode A membrane electrode assembly 106 in which 104 was integrated was produced.
  • a flat plate made of sulfate-resistant stainless steel SUS316L having an outer shape of 25 mm ⁇ 25 mm and a thickness of 300 ⁇ m was used as the anode current collecting layer 105.
  • the flat plate was etched to form a fuel flow path 107 having a groove width of 500 ⁇ m and a depth of 200 ⁇ m.
  • Another unit cell 101 was manufactured by the same method, and the fuel cell stack 11 was formed by arranging the interlayer distance between the unit cells 101 as shown in FIG.
  • the material of the water absorbing member 14 was a polyester nonwoven fabric (manufactured by Bell Development Co., Ltd.) having a basis weight of 600 g / cm 2 and containing a low boiling point polyester binder and a water absorbing polymer. Then, the polyester nonwoven fabric was sandwiched between stainless plates using a 3 mm spacer, hot-pressed at 100 ° C. and 100 kN for 1 minute, naturally cooled to 70 ° C. while maintaining a pressure of 100 kN, A porous material having a thickness of 3 mm and a specific gravity of 0.19 g / cm 3 was formed. And what cut out the said porous material to the magnitude
  • a silicon rubber heater was used as the heat source 12.
  • the heat conductive member 13 was formed by apply
  • the heat conducting member 13 also has a bonding function.
  • the water absorbing member 14 is laminated on the heat conducting member 13 and dried at 80 ° C. for 60 minutes, whereby the heat conducting member 13 and the water absorbing member 14 are obtained. And glued together.
  • a Teflon (registered trademark) tube having an outer diameter of 360 ⁇ m (inner diameter: 150 ⁇ m ⁇ ) is inserted from the end of the fuel flow path 107 into the fuel flow path, and a gap between the Teflon (registered trademark) tube and the end of the fuel flow path 107 is inserted.
  • the fuel cell system shown in FIG. 1 was produced.
  • FIG. 7 is a view showing the fuel cell system when the fuel cell stack 11 and the water absorbing member 14 of the fuel cell system 10 of FIG.
  • the fuel cell stack and the water absorbing member of the fuel cell system were covered with an acrylic casing 100.
  • This acrylic casing 100 has an outer width of 3 cm ⁇ depth of 2 cm ⁇ height of 4 cm, and has an air intake and supply opening 15 formed on the three horizontal surfaces and the upper surface.
  • power generation evaluation was performed by supplying a 3M aqueous methanol solution to the fuel flow path of the fuel cell stack using a pump at a speed of 0.5 cc / min to generate power.
  • the power density after 5 minutes of the fuel cell stack was 40 mW / cm 2
  • the power density after continuous use for 1 hour was 30 mW / cm 2 .
  • no liquid leakage was confirmed even after 5 hours of continuous use.
  • Comparative Example 1 The fuel cell system of Comparative Example 1 has a structure in which the heat conducting member and the heat source of the fuel cell system of Example 1 are excluded, and the fuel of Comparative Example 1 is the same as in Example 1 except for the above. A battery system was fabricated.
  • the fuel cell system of Comparative Example 1 includes the fuel cell stack of Example 1 and a water absorbing member.
  • an output density of 35 mW / cm 2 was obtained after 5 minutes.
  • the power density after 1 hour of continuous use decreased to 12 mW / cm 2 , and after 5 hours of continuous use, liquid leakage occurred from the water absorbing member.
  • Example 1 was superior to 5 mW / cm 2 by comparing the power density after 5 minutes from the start of use. From this, it was found that the fuel cell system of Example 1 was superior in maximum power density.
  • Example 1 when comparing the power density after one hour has elapsed since the start of use, the power density of Example 1 is about three times the power density of Comparative Example 1. Are better. From this, it was found that the fuel cell system of Example 1 was superior in terms of output stability.
  • Example 1 when the state after 5 hours from the start of use is compared, the fuel cell system of Example 1 is not leaked. In the fuel cell system of Example 1, liquid leakage occurred. This is considered to be due to the fact that the fuel cell system of Comparative Example 1 does not include a heat generation source and a heat conduction member.
  • Example 2 a fuel cell stack having the same structure as the fuel cell stack having the structure shown in FIG. 2 was produced.
  • a method for producing the fuel cell stack of Example 2 will be described.
  • a membrane electrode assembly composed of a cathode electrode, an electrolyte membrane, and an anode electrode produced by the same method as in Example 1 was cut with a trimming knife so that the outer shape was 2 mm ⁇ 25 mm and the electrode portion was 2 mm ⁇ 23 mm, A strip-shaped membrane electrode assembly was prepared.
  • a flat plate made of sulfuric acid-resistant stainless steel SUS316L having an outer shape of 2 mm ⁇ 25 mm and a thickness of 300 ⁇ m was used as the anode current collecting layer.
  • the flat plate was etched to form a fuel flow path having a groove having a width of 800 ⁇ m and a depth of 200 ⁇ m.
  • an anode current collecting layer, an anode electrode, and an electrolyte membrane are inserted into the through holes of the frame-shaped Teflon (registered trademark) spacer having a square through hole of 50 mm ⁇ 50 mm and a thickness of 0.6 mm from below.
  • the cathode electrodes were stacked in this order. This was sandwiched between 100 mm ⁇ 100 mm and 3 mm thick stainless steel plates, and then set to 130 ° C. and integrated by thermocompression bonding at 5 kgf / cm 2 for 2 minutes in the thickness direction of the stainless steel plates to produce unit cells. A total of ten unit cells 201 were produced by the same method.
  • the spacer 206 was produced by press-molding a titanium fiber sintered body (manufactured by Bekinit Co., Ltd.) having an outer shape of 1 ⁇ 14 mm, a thickness of 600 ⁇ m, and a porosity of 80% so as to have a thickness of 400 ⁇ m.
  • the long sides of the unit cell 201 were opposed to each other, a gap 214 of 1 mm was provided between the opposed long sides, and five pieces were arranged on a plane to produce one fuel cell layer 21.
  • a conductive paste (trade name: CARBOLLOID MRX-713J (manufactured by Tamura Kaken Co., Ltd.) was applied to one surface of the spacer 206 using a screen printing method so as to have a coating thickness of 30 ⁇ m. Then, four spacers 206 were arranged at a pitch of 2 mm so as to be orthogonal to the unit cell 201 of the fuel cell layer 21 to form the spacer layer 26, and laminated on the fuel cell layer 21 produced above.
  • the fuel cell layer 21 and the four spacers 206 were installed in the through holes of a 100 mm ⁇ 100 mm frame-shaped Teflon (registered trademark) spacer having a square through hole of 50 mm ⁇ 50 mm. After these were sandwiched between stainless steel plates of 100 mm ⁇ 100 mm and thickness 3 mm, the fuel cell layer 21 and the spacer 206 were integrated by thermocompression bonding at 130 ° C. and 5 kgf / cm 2 for 30 minutes in the thickness direction of the stainless steel plate, A stack of fuel cell layer 21 and spacer layer 26 was produced.
  • Teflon registered trademark
  • a fuel cell layer 21 was further produced on the spacer layer 26 of the laminate.
  • the fuel cell layer 21 formed first is referred to as a “first fuel cell layer”
  • the fuel cell layer 21 formed in the following process is referred to as a “second fuel cell layer”.
  • the first fuel cell layer and the second fuel cell layer do not distinguish the performance as the fuel cell layer.
  • a conductive paste (made by Tamura Kaken: CARBOLLOID MRX-713J) is applied by screen printing so that the coating thickness becomes 30 ⁇ m. Applied.
  • the first fuel cell is inserted into the through hole of the frame-shaped Teflon (registered trademark) spacer having a square through hole of 50 mm ⁇ 50 mm and a thickness of 1.5 mm through the spacer 206.
  • the unit cell of the layer and the unit cell 201 of the second fuel cell layer are at the same position, and the cathode of the unit cell 201 constituting the second fuel cell layer and the spacer 206 are opposed to each other Was installed.
  • the power density after 5 minutes of the fuel cell stack according to the present embodiment was 44 mW / cm 2 , and after the continuous use for 1 hour.
  • the power density was 41 mW / cm 2 . Furthermore, no liquid leakage was confirmed even after 5 hours of continuous use.
  • Example 2 was superior to 4 mW / cm 2 by comparing the power density after 5 minutes from the start of use. From this, it can be said that the fuel cell system of Example 2 is superior in maximum power density.
  • Example 2 was superior to 11 mW / cm 2 when the output density after 1 hour had elapsed since the start of use was compared. From this, it can be said that the fuel cell system of Example 2 is superior in terms of output stability.
  • the fuel cell system of Example 2 is superior in terms of maximum power density and output stability because the fuel cell stack used in the fuel cell system of Example 2 has the spacer layer 26. By including the space 210 and the gap 214 in the fuel cell stack, it is considered that the air could be circulated more efficiently.
  • a notebook computer a mobile phone, an electronic notebook, a portable game device, a mobile TV device, a handy terminal, a PDA, a mobile DVD player, a notebook computer, a video device, a camera device, a ubiquitous device, a mobile generator, etc.
  • a fuel cell system for electronic equipment can be provided.

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Abstract

L'invention porte sur un système de pile à combustible (10) qui comprend un empilement de piles à combustible (11) comprenant deux piles unitaires ou plus (101) chacune contenant une électrode de cathode, une membrane électrolytique et une électrode d'anode dans cet ordre, et également sur un dispositif électronique comprenant le système de pile à combustible (10). Des systèmes de pile à combustible sont récemment devenus le centre d'une attention accrue en tant qu'alimentations électriques de petite taille pour des dispositifs électroniques portables et similaires. Des systèmes de pile à combustible, cependant, ont des problèmes selon lesquels lorsque beaucoup d'eau est générée et condensée au niveau de l'électrode de cathode, l'eau fuit hors du système, et même si un élément absorbant l'eau pour empêcher une fuite est agencé, une fuite se produit si la capacité d'absorption d'eau de l'élément absorbant l'eau devient saturée. Le problème décrit ci-dessus a été résolu en munissant le système de pile à combustible (10) d'un élément absorbant l'eau (14) agencé sur la surface externe de l'empilement de piles à combustible de telle sorte que l'élément absorbant l'eau (14) communique dans l'espace avec l'électrode de cathode et absorbe l'eau générée au niveau de l'électrode de cathode, et d'une source de génération de chaleur (12) pour chauffer l'élément absorbant l'eau.
PCT/JP2009/069344 2008-12-22 2009-11-13 Système de pile à combustible comprenant une source de génération de chaleur pour chauffer un élément absorbant l'eau, et dispositif électronique le comprenant Ceased WO2010073849A1 (fr)

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JP2008326350A JP4959671B2 (ja) 2008-12-22 2008-12-22 燃料電池システムおよびそれを備えた電子機器

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Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5787143B2 (ja) * 2011-06-22 2015-09-30 Toto株式会社 固体酸化物形燃料電池装置
JP2013033687A (ja) * 2011-08-03 2013-02-14 Sharp Corp 蓄電池モジュール
CN102945973A (zh) * 2012-10-30 2013-02-27 新源动力股份有限公司 防止燃料电池电堆封装内结露的电堆封装板
CN110277578A (zh) * 2019-06-20 2019-09-24 福州大学 一种氨燃料电池系统及电动装置
JP7718798B2 (ja) * 2019-10-09 2025-08-05 株式会社巴川コーポレーション 伝熱体、熱交換ユニットおよび伝熱体取付方法

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH06188008A (ja) * 1992-04-01 1994-07-08 Toshiba Corp 燃料電池
WO2003090305A1 (fr) * 2002-04-19 2003-10-30 Sony Corporation Systeme de traitement d'eau de formation et procede de traitement d'eau de formation, et generateur d'electricite
JP2005183225A (ja) * 2003-12-19 2005-07-07 Alps Electric Co Ltd 燃料電池
US20050181251A1 (en) * 2004-02-13 2005-08-18 Kyu-Nam Han Fuel cell system
JP2006066318A (ja) * 2004-08-30 2006-03-09 Sony Corp 燃料電池システム及びその運転方法
JP2007165265A (ja) * 2005-12-16 2007-06-28 Fujitsu Ltd 燃料電池、電気機器、並びに、燃料電池における発生水の処理方法
JP2007234361A (ja) * 2006-02-28 2007-09-13 Toshiba Corp 燃料電池装置
US20080131745A1 (en) * 2006-12-04 2008-06-05 Toyota Jidosha Kabushiki Kaisha Fuel cells

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4487160B2 (ja) * 2000-05-24 2010-06-23 ソニー株式会社 電気エネルギー発生装置
JP5181634B2 (ja) * 2006-12-04 2013-04-10 トヨタ自動車株式会社 燃料電池

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH06188008A (ja) * 1992-04-01 1994-07-08 Toshiba Corp 燃料電池
WO2003090305A1 (fr) * 2002-04-19 2003-10-30 Sony Corporation Systeme de traitement d'eau de formation et procede de traitement d'eau de formation, et generateur d'electricite
JP2005183225A (ja) * 2003-12-19 2005-07-07 Alps Electric Co Ltd 燃料電池
US20050181251A1 (en) * 2004-02-13 2005-08-18 Kyu-Nam Han Fuel cell system
JP2006066318A (ja) * 2004-08-30 2006-03-09 Sony Corp 燃料電池システム及びその運転方法
JP2007165265A (ja) * 2005-12-16 2007-06-28 Fujitsu Ltd 燃料電池、電気機器、並びに、燃料電池における発生水の処理方法
JP2007234361A (ja) * 2006-02-28 2007-09-13 Toshiba Corp 燃料電池装置
US20080131745A1 (en) * 2006-12-04 2008-06-05 Toyota Jidosha Kabushiki Kaisha Fuel cells

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