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WO2018182324A1 - Capteur d'ammoniac - Google Patents

Capteur d'ammoniac Download PDF

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Publication number
WO2018182324A1
WO2018182324A1 PCT/KR2018/003699 KR2018003699W WO2018182324A1 WO 2018182324 A1 WO2018182324 A1 WO 2018182324A1 KR 2018003699 W KR2018003699 W KR 2018003699W WO 2018182324 A1 WO2018182324 A1 WO 2018182324A1
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WO
WIPO (PCT)
Prior art keywords
ammonia
electrode
plate
solid electrolyte
pair
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/KR2018/003699
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English (en)
Korean (ko)
Inventor
박진수
김정민
이태훈
박준형
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Cometnetwork Co Ltd
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Cometnetwork Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
Priority claimed from KR1020170041102A external-priority patent/KR101951253B1/ko
Application filed by Cometnetwork Co Ltd filed Critical Cometnetwork Co Ltd
Priority to JP2018535010A priority Critical patent/JP2020512524A/ja
Publication of WO2018182324A1 publication Critical patent/WO2018182324A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
    • G01N27/26—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating electrochemical variables; by using electrolysis or electrophoresis
    • G01N27/28—Electrolytic cell components
    • G01N27/30—Electrodes, e.g. test electrodes; Half-cells
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
    • G01N27/26—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating electrochemical variables; by using electrolysis or electrophoresis
    • G01N27/403—Cells and electrode assemblies
    • G01N27/406—Cells and probes with solid electrolytes
    • G01N27/407—Cells and probes with solid electrolytes for investigating or analysing gases
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
    • G01N27/26—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating electrochemical variables; by using electrolysis or electrophoresis
    • G01N27/416—Systems
    • G01N27/4162—Systems investigating the composition of gases, by the influence exerted on ionic conductivity in a liquid
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
    • G01N33/0004—Gaseous mixtures, e.g. polluted air
    • G01N33/0009—General constructional details of gas analysers, e.g. portable test equipment
    • G01N33/0027—General constructional details of gas analysers, e.g. portable test equipment concerning the detector
    • G01N33/0036—General constructional details of gas analysers, e.g. portable test equipment concerning the detector specially adapted to detect a particular component
    • G01N33/0054—Ammonia

Definitions

  • the present invention provides a measuring device for measuring one of a plate-like sensor element having a pair of electrodes having different reactivity with ammonia on a surface of a plate-like solid electrolyte having oxygen ion conductivity and a potential difference or current between the pair of electrodes. It is related with the ammonia sensor provided with both and a pair of electrodes formed so that it may expose to the gas to be measured.
  • Patent Document 1 Japanese Patent Application Laid-Open No. 2013-40959
  • This invention is made
  • a plate-shaped sensor element having a pair of electrodes having different reactivity with respect to ammonia on the surface of the plate-shaped solid electrolyte having oxygen ion conductivity;
  • a measuring device for measuring one of a potential difference or a current between the pair of electrodes
  • the characteristic configuration is
  • the solid electrolyte is formed of a porous
  • the pair of electrodes comprises a first electrode having an oxidation activity for ammonia and a second electrode having a lower oxidation activity for ammonia than the first electrode,
  • the first electrode includes a material having a high oxidation activity against ammonia, including at least one of ZnO, SnO 2 and In 2 O 3 , 50 to 90 Wt%, 1 to 15 Wt% glass,
  • the gas to be measured passes through the solid electrolyte and flows from one side to the other side of the solid electrolyte of the sensor element. For this reason, the measurement target gas rapidly reaches the entire interface between the solid electrolyte and the electrode where the electrode reaction of the measurement target gas becomes active. As a result, since the electrode reaction of ammonia contained in the measurement target gas proceeds, electromotive force according to the concentration of ammonia is rapidly generated between the pair of electrodes. Since the ammonia concentration can be detected by measuring the electromotive force generated thus quickly by the measuring device, the ammonia concentration detection responsiveness can be improved.
  • the flow of the gas to be measured is hindered.
  • the gas to be newly introduced from outside reaches the entire interface between the solid electrolyte and the electrode quickly, and the ammonia concentration detection response cannot be improved.
  • the measurement target gas quickly reaches the entire interface between the electrode and the solid electrolyte in which the electrode reaction of the measurement target gas becomes active, the ammonia concentration detection responsiveness can be improved. Can be.
  • the electrode reaction for oxidizing ammonia in the first electrode is promoted, it is possible to generate electromotive force between the pair of electrodes in a state where the first electrode is an anode and the second electrode is a cathode.
  • the 1st electrode contains glass, it is possible to improve the sintering property of a 1st electrode.
  • One of the pair of electrodes is formed on one side of the solid electrolyte, and the sensor element is provided with the other one of the pair of electrodes formed on the other side opposite to one side of the solid electrolyte.
  • the electrode reaction of the gas to be measured since the gas to be measured passes through the solid electrolyte after passing through the interface between one electrode and the solid electrolyte, and reaches the interface between the other electrode and the solid electrolyte, the electrode reaction of the gas to be measured is It quickly reaches the interface between the solid electrolyte and one electrode which becomes active and the interface between the solid electrolyte and the other electrode. Thereby, since the electrode reaction of ammonia contained in the measurement target gas is promoted, the detection response of ammonia concentration can be improved. In addition, since electrodes are provided on each of one side and the other side of the solid electrolyte, the electrode area can be formed on each of one side and the other side of the solid electrolyte to be wide. Thereby, the electrode reaction of ammonia contained in the measurement object gas can be promoted to each electrode.
  • One side of the solid electrolyte is provided with the sensor element in which the pair of electrodes are formed.
  • the measurement target gas reaches one side of the solid electrolyte provided with all the electrodes, so that it is included in the measurement target.
  • Electromotive force is generated by the electrode reaction of ammonia. Therefore, the electromotive force generated by the electrode reaction of the ammonia contained in the gas to be measured can be measured without the gas to be measured reaching the other side of the solid electrolyte. Thereby, ammonia concentration can be detected quickly.
  • the second electrode includes a noble metal.
  • the noble metal since the noble metal has a high decomposition activity for decomposing oxygen molecules into oxygen ions, it is possible to promote an electrode reaction for oxygen ionizing oxygen contained in the measurement target gas at the second electrode serving as a cathode. Do. As a result, since a large electromotive force is generated between the pair of electrodes, the ammonia concentration contained in the measurement target gas can be detected more accurately based on the electromotive force.
  • the second electrode includes a material having a decomposition activity for nitrogen oxide gas.
  • the nitrogen oxide gas contained in the measurement target gas acts on the electrode reaction for oxidizing ammonia, thereby preventing the decrease in the electromotive force generated between the pair of electrodes.
  • the gas to be measured contains nitrogen dioxide as a nitrogen oxide gas
  • the nitrogen dioxide acts on an electrode reaction for oxidizing ammonia at the first electrode, which is an anode, whereby the electromotive force generated between the pair of electrodes is reduced.
  • the electromotive force generated between the pair of electrodes is reduced.
  • the electromotive force generated between the pair of electrodes Is increased. Therefore, the above-mentioned electromotive force fall can be prevented.
  • the concentration of nitrogen dioxide contained in the gas to be measured increases, and similarly, the nitrogen dioxide acts on the electrode reaction of the second electrode. This increases the amount of electromotive force generated. Therefore, at any concentration of nitrogen dioxide, the reduction in electromotive force generated by the action of nitrogen dioxide on the electrode reaction of the first electrode can be prevented by the increase in electromotive force generated by the action of nitrogen dioxide on the electrode reaction of the second electrode. Can be. Therefore, even when nitrogen dioxide is contained in the measurement target gas, it is possible to prevent a decrease in the electromotive force generated between the pair of electrodes.
  • the material having a decomposing activity for the nitrogen oxide gas is NiO, CuO, Cr 2 O 3 , WO 3, 2CuO-Cr 2 O 3, LaNiO 3 , LaCoO 3 , La 0 . 6 Sr 0 . 4 Co 0 . 8 Fe 0 . 2 O 3 , La 0 . 8 Sr 0 . 2 MnO 3 or La 0 . 85 Sr 0 . 15 CrO 3 At least one of the materials.
  • the nitrogen oxide gas contained in the measurement target gas acts on the electrode reaction for oxidizing ammonia, thereby preventing the decrease in the electromotive force generated between the pair of electrodes.
  • Each of the pair of electrodes comprises at least one of an oxygen ion conductive solid electrolyte, alumina, zirconia and glass.
  • each of the pair of electrodes contains a solid electrolyte of oxygen ion conductivity
  • the interface between the electrode material and the solid electrolyte in which the electrode reaction in the electrode is activated is increased. Therefore, the electrode reaction can be promoted to each of the pair of electrodes.
  • each pair of electrodes contains alumina or zirconia
  • the electrical resistance value of each pair of electrodes can be adjusted. Specifically, by adjusting the content of alumina or zirconia, which is an insulator, the electrical resistance of each of the pair of electrodes can be adjusted to the desired resistance. For example, by adjusting the electrical resistance of each electrode, the influence of moisture and oxygen, which are coexisting gases contained in the measurement target gas, on the electromotive force generated between the pair of electrodes can be reduced as much as possible.
  • each pair of electrodes contains glass
  • the sinterability of an electrode can be improved.
  • the glass can be included in the electrode, the sinterability of the electrode can be improved. Even when zirconia is included in the electrode, it is possible to prevent the sintering temperature of the electrode from becoming high.
  • the solid electrolyte is formed of any one of yttria stabilized zirconia (YSZ), scandia stabilized zirconia (ScSZ), samarium doped ceria (SDC), gadolinium doped ceria (GDC) or thorium dioxide (ThO 2 ). Is that it is.
  • YSZ yttria stabilized zirconia
  • ScSZ scandia stabilized zirconia
  • SDC samarium doped ceria
  • GDC gadolinium doped ceria
  • ThO 2 thorium dioxide
  • the solid electrolyte since the solid electrolyte has good oxygen ion conductivity, it is possible to efficiently transport oxygen ions generated at the electrode serving as the cathode into the solid electrolyte. And by measuring the large electromotive force which arises with favorable movement of oxygen ion, the ammonia density
  • the non-combustible oxidation catalyst layer for oxidizing carbon monoxide and hydrocarbons contained in the measurement target gas is provided on at least one of the one side and the other side of the plate-shaped sensor element.
  • carbon monoxide and hydrocarbons are oxidized and removed before they enter the pair of electrodes because carbon monoxide and hydrocarbons that may inhibit the electrode reaction in the pair of electrodes are reacted at the pair of electrodes. Can be prevented. Thereby, the fall of the detection precision of ammonia concentration can be prevented.
  • the unburned oxidation catalyst layer comprises a porous ceramic in which at least one of Pt, Pd, Rh, Ir, Ru or Ag is dispersed and supported.
  • An ammonia oxidation catalyst layer for oxidizing ammonia contained in the measurement target gas is provided on the one side or the other side of the plate-shaped sensor element.
  • part or all of the ammonia contained in the measurement target gas can be oxidized and removed before the measurement target gas flows into the pair of electrodes.
  • an ammonia oxidation catalyst layer which oxidizes and removes ammonia of a predetermined concentration
  • ammonia contained in the measurement target gas is not detected.
  • ammonia can be detected.
  • the ammonia oxidation catalyst layer is Co 3 O 4 , MnO 2 , V 2 O 5 , Ni-Al 2 O 3 , Fe-Al 2 O 3 , Mn-Al 2 O 3 , CuO-Al 2 O 3 , Fe 2 O 3 -Al 2 O 3 , Fe 2 O 3 -TiO 2 , Fe 2 O 3 -ZrO 2 Or at least one of the metal ion exchange zeolites.
  • ammonia contained in the measurement target gas since it is possible to oxidize and remove some or all of the ammonia contained in the measurement target gas before the measurement target gas flows into the pair of electrodes, for example, If ammonia contained in the target gas is below a predetermined concentration, ammonia can be detected without exceeding the predetermined concentration.
  • the support body which supports the said plate-shaped sensor element is provided in the said one side surface or the said other side surface of the said plate-shaped sensor element,
  • the said support body is equipped with the heater which heats the said plate-shaped sensor element.
  • the mechanical strength of a plate-shaped sensor element can be reinforced.
  • the heater which heats a plate-shaped sensor element is provided, a plate-shaped sensor element can be heated to predetermined optimal temperature.
  • a support for supporting the plate sensor element is provided on the one side of the plate sensor element, and the carbon monoxide and the hydrocarbon contained in the measurement target gas are provided on the other side of the plate sensor element on which the first electrode is formed.
  • An unburned oxide oxidation catalyst layer for oxidizing and an ammonia oxidation catalyst layer for oxidizing ammonia contained in the gas to be measured are provided in a stacked state.
  • the gas to be measured flows in from the other side of the plate sensor element, it passes through the unburned oxidation catalyst layer and the ammonia oxidation catalyst layer and flows into the plate sensor element, thereby inhibiting the electrode reaction of ammonia. Since potential carbon monoxide and hydrocarbons are oxidized and removed before entering the first electrode, a decrease in detection accuracy of the ammonia concentration can be prevented.
  • ammonia contained in the measurement target gas is oxidized and removed before entering the first electrode, for example, when ammonia contained in the measurement target gas is below a predetermined concentration, ammonia is not detected. Instead, ammonia can be detected when it exceeds a predetermined concentration.
  • the plate-shaped sensor element is supported by the support, the mechanical strength of the plate-shaped sensor element can be reinforced.
  • a power supply device for applying a constant voltage or a constant current between the pair of electrodes.
  • the electrode reaction can be promoted in the pair of electrodes by applying a constant voltage or a constant current between the pair of electrodes.
  • a constant voltage or a constant current is applied between the pair of electrodes.
  • a power supply device for applying a voltage or a current in a state in which the first electrode becomes an anode and in a state in which the second electrode becomes a cathode.
  • an electrode reaction for oxidizing ammonia contained in the gas to be measured at the first electrode by applying a voltage or a current by a power supply such that the first electrode is an anode and the second electrode is a cathode. This is accelerated, and the electrode reaction which ionizes oxygen contained in the measurement target gas is accelerated in the second electrode. Therefore, as described above, even when the electromotive force generated based on the electrode reaction of ammonia is so small that it is difficult to detect the ammonia concentration contained in the gas to be measured from the electromotive force, the ammonia concentration contained in the gas to be measured is accurately determined. Can be detected.
  • the gas to be measured passes through the solid electrolyte and flows from one side to the other side of the solid electrolyte of the sensor element. For this reason, the measurement target gas rapidly reaches the entire interface between the solid electrolyte and the electrode where the electrode reaction of the measurement target gas becomes active. As a result, since the electrode reaction of ammonia contained in the measurement target gas proceeds, electromotive force according to the concentration of ammonia is rapidly generated between the pair of electrodes. Since the ammonia concentration can be detected by measuring the electromotive force generated thus quickly by the measuring device, the ammonia concentration detection responsiveness can be improved.
  • the ammonia sensor according to the present invention improves the sinterability of the electrode because a glass component is added to the electrode.
  • the improvement of the sintering property of the electrode can minimize the difference in thermal expansion coefficient between the electrode and the solid electrolyte, thereby improving the mechanical bonding strength.
  • the addition of the glass component may improve the interfacial stability of the electrode and the solid electrolyte to improve the sensor signal stability.
  • Charge exchange reaction of NH 3 in the ammonia sensor according to the present invention is the sum of reactions in a plurality of micro-cells, and the interfacial stability of the electrode and the solid electrolyte minimizes the change of the micro-cells. Sensor signal changes can be suppressed.
  • the addition of the glass component can improve the signal size of the ammonia sensor according to the present invention.
  • the signal of the ammonia sensor according to the invention is generated by an electrochemical catalyst (with charge exchange) reaction at the electrode of the non-equilibrium target gas.
  • the electrode can also play the role of a chemical catalyst (no charge exchange), and when the measurement target gas is an unbalanced gas, the concentration decreases due to the chemical catalysis in the process of passing the electrode through the electrode.
  • the signal from the sensor is reduced because it reaches. Therefore, as the porosity of the electrode increases, the sensitivity decreases, so that the porosity decrease due to the improvement of sinterability due to the addition of the glass component may improve the sensitivity (signal size) of the sensor.
  • FIG. 1 is a schematic diagram of an ammonia sensor according to a first embodiment of the present invention.
  • FIG. 2 is a cross-sectional view of the ammonia sensor according to the first embodiment of the present invention.
  • FIG 3 is an exploded perspective view of the ammonia sensor according to the first embodiment of the present invention.
  • FIG. 4 is a diagram showing a relationship between voltage and current of the ammonia sensor according to the first embodiment of the present invention.
  • FIG. 5 is a diagram showing the responsiveness of the ammonia sensor when the ammonia concentration is increased according to the first embodiment of the present invention.
  • Fig. 6 is a diagram showing the responsiveness of the ammonia sensor when the ammonia concentration is reduced according to the first embodiment of the present invention.
  • FIG. 8 is a diagram showing a relationship between ammonia concentration and electromotive force according to the first embodiment of the present invention.
  • FIG 9 is an exploded perspective view of the ammonia sensor according to the second embodiment of the present invention.
  • FIG. 10 is a cross-sectional view of the ammonia sensor according to the second embodiment of the present invention.
  • FIG. 11 is an exploded perspective view of the ammonia sensor according to the third embodiment of the present invention.
  • FIG. 12 is a cross-sectional view of the ammonia sensor according to the third embodiment of the present invention.
  • FIG. 13 is a schematic diagram of an ammonia sensor according to another embodiment of the present invention.
  • Ammonia sensor according to one embodiment of the invention e.g., as an element the gas to measure the exhaust gas discharged from the SCR system with a diesel engine, and is used to detect the concentration of ammonia NH 3 contained in the exhaust gas.
  • the measurement target gas which the ammonia sensor of this embodiment uses as a measurement target gas is not limited to the discharge gas discharged
  • the ammonia sensor 100 which concerns on this embodiment is equipped with the plate-shaped sensor element 20.
  • the plate-shaped sensor element 20 includes a plate-shaped solid electrolyte 1 having oxygen ion conductivity and a pair of electrodes 2 formed on the surface of the solid electrolyte 1.
  • One side of the plate-shaped sensor element 20 is provided with a support 3 for supporting the plate-shaped sensor element 20, and the other side of the plate-shaped sensor element 20 is an unburned oxidation catalyst layer 4 for oxidizing carbon monoxide and hydrocarbons contained in the gas to be measured. Is provided.
  • the lower side of the drawing toward the support 3 from the plate-shaped sensor element 20 is referred to as one side
  • the upper side of the drawing toward the plate-shaped sensor element 20 from the support 3 is referred to as the other side. It is called.
  • the ammonia sensor 100 is provided with a measuring device 12 that measures either the potential difference or the current between the pair of electrodes 2.
  • This measuring device 12 is connected to a pair of terminals 6 provided in the support 3.
  • the measuring device 12 measures the electromotive force generated between the pair of electrodes 2 with respect to the concentration of ammonia contained in the measurement target gas.
  • a pair of terminal 6 is connected to the pair of electrode 2 by the lead wire 5 with which the support body 3 was equipped.
  • the exhaust gas ammonia concentration can be detected.
  • the ammonia sensor 100 is disposed in an exhaust pipe or the like through which the gas to be measured flows, the ammonia concentration of the gas to be measured is detected.
  • Solid electrolyte 1 is formed in a rectangular plate shape.
  • the solid electrolyte 1 is made of porous material, and the porosity of the porous material is formed to be any porosity between 10% and 80%. In this embodiment, the porosity of the solid electrolyte 1 is formed to be 23%.
  • the solid electrolyte 1 is provided with many through-holes from which the gas to be measured reaches from one side of the solid electrolyte 1 to the other side facing the one side. This through hole is formed by connecting fine pores in the solid electrolyte 1.
  • the solid electrolyte 1 is made of one of yttria stabilized zirconia (YSZ), scandia stabilized zirconia (ScSZ), samarium-doped ceria (SDC), gadolinium-doped ceria (GDC), or thorium dioxide (ThO 2 ). It is formed.
  • YSZ yttria stabilized zirconia
  • ScSZ scandia stabilized zirconia
  • SDC samarium-doped ceria
  • GDC gadolinium-doped ceria
  • ThO 2 thorium dioxide
  • one electrode 2a (referred to as one electrode) of a pair of electrodes 2 is formed on one side of the plate-shaped solid electrolyte 1 so as to face one side of the plate-shaped solid electrolyte 1.
  • One electrode 2a and the other electrode 2b are formed in a thin plate shape, and at the same time, are formed in a rectangular shape in a plan view from the thickness direction of the solid electrolyte 1. Moreover, it is formed so that it may be slightly smaller than the solid electrolyte 1 in the planar viewpoint seen from the thickness direction of the solid electrolyte 1.
  • the measurement target gas E flows in from the other side of the plate-shaped sensor element 20 and is inside the other electrode 2b, the solid electrolyte 1, and the one electrode 2a. It passes through and flows to one side of the plate-shaped sensor element 20. And the measurement object gas E which flowed to the other side from the other side of the plate-shaped sensor element 20 flows out of the plate-shaped sensor element 20 from the one side side of the plate-shaped sensor element 20.
  • both of the pair of electrodes 2 provided on one side and the other side of the plate-shaped sensor element 20 are formed to be exposed to the measurement target gas E.
  • the measurement object gas E flows in from one side of the plate-shaped sensor element 20, passes through one electrode 2a, the solid electrolyte 1 and the other electrode 2b, and flows to the other side of the plate-shaped sensor element 20. You may.
  • the pair of electrodes 2 are a first electrode C having an oxidation activity with respect to ammonia contained in the measurement target gas, and a second electrode D having a lower oxidation activity with respect to ammonia contained in the measurement target gas than the first electrode C. Consists of. In this embodiment, one electrode 2a is referred to as the second electrode D and the other electrode 2b is referred to as the first electrode C. FIG.
  • the first electrode C is ZnO, SnO 2 and In 2 O 3 which are materials having high oxidation activity against ammonia.
  • the second electrode D is formed of a noble metal containing at least one of the above, and having a lower oxidation activity to ammonia than a material having a higher oxidation activity to these ammonias.
  • the first electrode C is formed including ZnO, and the second electrode D is formed of platinum.
  • an anode reaction occurs in which oxygen ions contained in the gas to be measured become oxygen gas.
  • an anodic reaction by ammonia occurs as shown in the following formula (2).
  • the above-described electrode reaction occurs at the first electrode C and the second electrode D, so that the electromotive force according to the concentration of ammonia contained in the gas to be measured is reduced. It occurs between the pair of electrodes 2.
  • the electromotive force is measured by the measuring apparatus 12, the ammonia concentration contained in the measurement target gas can be detected.
  • the first electrode C is formed including one or more of a solid electrolyte, alumina, zirconia, and glass of oxygen ion conductivity.
  • the 1st electrode C is formed including the solid electrolyte of oxygen ion conductivity, alumina, and glass.
  • the first electrode C contains yttria stabilized zirconia (YSZ), in the first electrode C, the interface between the electrode material and the solid electrolyte increases, so that the electrode reaction is activated. As a result, in the first electrode C, the electrode reaction is promoted.
  • the solid electrolyte of oxygen ion conductivity is contained in the range of 5-30 Wt% in the 1st electrode C.
  • the oxygen ion conductive solid electrolyte is yttria stabilized zirconia (YSZ) similarly to solid electrolyte 1.
  • each said resistance value of the 1st electrode C can be adjusted to desired resistance value.
  • the said resistance value of the 1st electrode C can be adjusted so that the bad influence which moisture and oxygen which are coexistence gases contained in the measurement object gas have on ammonia concentration detection as possible as possible can be minimized.
  • alumina is contained in the 1st electrode C in the range of 1-30 Wt%.
  • the first electrode C contains glass, it is possible to improve the sinterability of the first electrode C when the ammonia sensor 100 is made. It is preferable that the glass is contained in the range of 1 to 15 Wt% in the first electrode C. In this embodiment, glass has silicon dioxide as a main component.
  • a material having a high oxidation activity against ammonia is preferably contained in a range of 50 to 90 Wt%.
  • the first electrode C contains ZnO, yttria stabilized zirconia, alumina, and glass in a weight ratio of 65: 27: 6: 2, which has a high oxidation activity against ammonia.
  • the method for detecting ammonia concentration by the ammonia sensor 100 is, for example, before detecting the ammonia concentration of the gas to be measured by the ammonia sensor 100, using an ammonia mixed gas having a known ammonia concentration.
  • the electromotive force generated between the pair of electrodes 2 is measured.
  • a relation curve of ammonia concentration and electromotive force is prepared.
  • a detection device (not shown) for detecting the ammonia concentration may be provided. That is, an electromotive force measured by the measuring device 12 is input, and at the same time, the relationship curve between the ammonia concentration and the electromotive force is stored, and a detection device for detecting the ammonia concentration from the input power force and the stored relationship curve is provided. , Ammonia concentration can be detected.
  • the unburned oxidation catalyst layer 4 shown in FIGS. 1 to 3 is formed in a porous material through which the gas to be measured is permeable, and in order to oxidize carbon monoxide and hydrocarbons contained in the gas to be measured, Pt, Au, Pd, Rh, Ir, Ru, or Ag It is formed of one or more materials selected from precious metals such as these, porous ceramics in which these precious metals are dispersed and supported.
  • the unburned oxidation catalyst layer 4 is formed of a porous ceramic dispersedly supported by platinum.
  • the unburned oxidation catalyst layer 4 is formed in the same dimension as the solid electrolyte 1 from the planar view point viewed from the thickness direction of the solid electrolyte 1. Therefore, the unburned oxidation catalyst layer 4 covers the entirety of the other side surface of the other electrode 2b formed on the other side of the solid electrolyte 1, and at the same time, the periphery of the unburned oxidation catalyst layer 4 is provided at the periphery of the solid electrolyte 1. It is laminated
  • the support body 3 is formed by stacking the first support plate 3a and the second support plate 3b formed in an elongated shape.
  • the plate-shaped sensor element 20 is provided in the other side surface of the front end side part of the 1st support plate 3a in the longitudinal direction.
  • the plate-shaped sensor element 20 is formed on the other side of the first support plate 3a in a state where one electrode 2a is sandwiched between the solid electrolyte 1 and the support 3, and the peripheral portion of the solid electrolyte 1 is in close contact with the support 3. It is stacked.
  • a pair of terminals 6 are provided on the other side of the rear end side portion in the longitudinal direction of the first supporting plate 3a. A pair of terminals 6 are connected to the measuring device 12. Moreover, the lead wire 5 which connects a pair of electrode 2 of the plate-shaped sensor element 20 to a pair of terminal 6 is provided in the other side surface of the 1st support plate 3a. Lead wire 5 is made of platinum.
  • the heater 8 which heats the plate-shaped sensor element 20 is provided between the 1st support plate 3a and the 2nd support plate 3b.
  • the heater 8 is located between the first support plate 3a and the second support plate 3b and at the same time at the front end side portion in the longitudinal direction of the first support plate 3a and the second support plate 3b, and viewed from the thickness direction of the solid electrolyte 1. It is provided in the position which overlaps with the plate-shaped sensor element 20.
  • the pair of heater terminals 9 is provided in the rear end side part of the 2nd support plate 3b in the longitudinal direction.
  • the heater 8 and the pair of heater terminals 9 are connected by a heater connecting line 10.
  • the pair of heater terminals 9 are provided on one side of the second support plate 3b and are connected to a heater power supply (not shown). The heater 8 can be heated to a predetermined temperature by this heater power supply.
  • the first support plate 3a and the second support plate 3b are made of dense alumina and yttria stabilized zirconia (YSZ). In addition, when formed from yttria stabilized zirconia (YSZ), an insulating layer such as alumina or zirconia (not shown) is formed between the first support plate 3a and the heater 8 and between the second support plate 3b and the heater 8.
  • YSZ yttria stabilized zirconia
  • the voltage on the horizontal axis is an applied voltage applied between the pair of electrodes 2
  • the current on the vertical axis is a current generated between the pair of electrodes 2 due to the applied voltage.
  • the relationship between the voltage and the current is a voltage between -5V and 5V between the pair of electrodes 2 in a state where the ammonia sensor 100 is heated to 700 ° C in a dry mixed gas of 21% oxygen and 79% nitrogen.
  • the thickness of the solid electrolyte 1 is 50 ⁇ m.
  • the change in electromotive force (EMF) shown in FIG. 5 and FIG. 6 shows a change in electromotive force output from the ammonia sensor 100 when the ammonia concentration contained in the measurement target gas changes, and the response of the ammonia sensor 100 of the present embodiment is changed. It is a surname.
  • the electromotive force shown in FIG. 5 and FIG. 6 uses the mixed gas which mixed ammonia with the combustion gas containing 13% of oxygen which generate
  • the change in electromotive force of the ammonia sensor 100 shown in FIG. 5 is a change in electromotive force when the ammonia concentration of the measurement target gas is increased from 0 ppm to 42 ppm, and the voltage change shown in FIG. 6 is 208 ppm of the ammonia concentration of the measurement target gas.
  • FIG. 5 and 6 show changes in electromotive force output from ammonia sensors composed of conventional dense solid electrolytes.
  • the electromotive force of the ammonia sensor 100 of this embodiment was shown by the solid line, and the electromotive force of the conventional ammonia sensor was shown by the broken line.
  • concentration of the measurement object gas was shown to 0 horizontal axis.
  • the ammonia sensor 100 of the present embodiment has a solid electrolyte in which the solid electrolyte 1 is made of porous, and the measurement target gas is active in the electrode reaction of the measurement target gas. Since the entire electrode including the interface between the electrode 1 and electrode 2 is reached quickly, the electromotive force according to the ammonia sensor concentration was output faster than the conventional ammonia sensor in both the increase in the ammonia concentration and the decrease in the ammonia concentration. Therefore, it turns out that the responsiveness of the ammonia sensor 100 improves compared with the conventional ammonia sensor.
  • the electromotive force shown in FIG. 5 and FIG. 6 is measured by the measuring apparatus 12, and ammonia concentration is detected by this detection apparatus from this electromotive force.
  • FIG. 7 shows the results of investigating the influence of moisture and oxygen contained in the measurement target gas on the electromotive force of the ammonia sensor 100 of the present embodiment.
  • the electromotive force (EMF) shown in FIG. 7 is obtained by arranging the ammonia sensor 100 in an exhaust pipe through which the gas to be measured flows, and changing the water concentration and oxygen concentration of the gas to be measured in a state where the ammonia sensor 100 is heated to 700 ° C. It is the electromotive force obtained.
  • ammonia gas was added to the measurement target gas so that the ammonia concentration of the measurement target gas was 250 ppm.
  • an oxygen concentration of 21%, a water concentration of 1% and a nitrogen balance target gas are used, and in a period P2 including the period c and the period d, the oxygen concentration is 15%.
  • Measurement target gas of moisture concentration 3% and nitrogen balance was used.
  • ammonia was not included in the measurement target gas.
  • the ammonia sensor 100 does not affect the electromotive force generated with respect to the ammonia concentration even when the water concentration and the oxygen concentration change at least in the above concentration range. Thereby, even when the water concentration and oxygen concentration contained in the measurement target gas change, the ammonia concentration of the measurement target gas can be detected accurately.
  • the electromotive force shown in FIG. 7 is an electromotive force obtained by making the measurement object gas of the flow volume smaller than the electromotive force shown in FIG. 5 and FIG. 6 as a measurement object gas. Therefore, the responsiveness of the ammonia sensor 100 shown in FIG. 7 differs from the responsiveness of the ammonia sensor 100 shown in FIGS. 5 and 6.
  • FIG. 8 shows the relationship between the ammonia concentration and the electromotive force (EMF) of the ammonia sensor 100 of the present embodiment.
  • the relationship between the ammonia concentration and the electromotive force shown in FIG. 8 is a measurement gas using a mixed gas in which ammonia is mixed with a combustion gas containing an oxygen concentration of 13% generated by combustion of LP gas. It is a relationship between the ammonia concentration and electromotive force obtained in the state which arrange
  • the temperature of the combustion gas was 135 ° C, and the ammonia concentration of the measurement target gas was changed by adjusting the amount of ammonia mixed in the combustion gas.
  • the relationship between the ammonia concentration and the electromotive force shown in the drawing is an example of a relationship curve between the ammonia concentration and the electromotive force, and by referring to this relationship curve, the ammonia concentration corresponding to the electromotive force measured by the measuring apparatus 12 can be detected.
  • FIGS. 9 and 10 differs from the first embodiment described above in that the plate-shaped sensor element 20 in which a pair of electrodes 2 are formed on one side of the solid electrolyte 1 is provided.
  • 9 is an exploded perspective view of the ammonia sensor 100 according to the present embodiment
  • FIG. 10 is a cross-sectional view of a portion in which the plate-like sensor element 20 is provided in the longitudinal direction of the ammonia sensor 100 according to the present embodiment.
  • a pair of electrodes 2 are provided between the solid electrolyte 1 and the support 3 in a state in which the pair of electrodes 2 are arranged in a short direction that runs straight in the longitudinal direction of the support 3. .
  • the pair of electrodes 2 are composed of the right electrode 2c provided on the right side and the left electrode 2d provided on the left side from the rear end side in the longitudinal direction of the support body 3 to the front end side.
  • the right electrode 2c is the first electrode C and the left electrode 2d is the second electrode D.
  • the right electrode 2c and the left electrode 2d are formed in a thin plate shape and, in a plan view viewed from the thickness direction of the solid electrolyte 1, are formed in a rectangular shape having a long side in the longitudinal direction of the support 3.
  • the solid electrolyte 1 is formed of porous material having a through hole, one side and the other side surface of the solid electrolyte 1 of the plate-shaped sensor element 20 in the thickness direction of the plate-shaped sensor element 20. A large number of gas through holes through which the measurement target gas flows are formed in the plate-shaped sensor element 20 during the period.
  • the measurement target gas E flows from the other side of the plate-shaped sensor element 20, passes through the solid electrolyte 1, the right electrode 2c, and the left electrode 2d, and forms a plate. It flows to one side of the sensor element 20.
  • the measurement target gas E that flowed from the other side of the plate sensor element 20 to one side flows out of the plate sensor element 20 from one side side of the plate sensor element 20.
  • both of the pair of electrodes 2 provided on one side and the other side of the plate-shaped sensor element 20 are formed to be exposed to the measurement target gas E.
  • the measurement target gas E flows into one side of the plate-shaped sensor element 20, passes through the right electrode 2c, the left electrode 2d, and the solid electrolyte 1, and can flow to the other side of the plate-shaped sensor element 20. have.
  • the unburned oxidation catalyst layer 4 formed porous is provided on the other side of the plate-shaped sensor element 20, the unburned oxidation catalyst layer 4 formed porous is provided. Specifically, the unburned oxidation catalyst layer 4 is formed in the same dimension as that of the solid electrolyte 1 in a plan view from the thickness direction of the solid electrolyte 1. The unburned oxidation catalyst layer 4 is laminated on the other side of the plate-shaped sensor element 20 in such a state that one side of the unburned oxidation catalyst layer 4 is in close contact with the other side of the solid electrolyte 1.
  • the support body 3 which supports the plate-shaped sensor element 20 is provided in one side surface of the plate-shaped sensor element 20.
  • the plate-shaped sensor element 20 is a state in which the right electrode 2c and the left electrode 2d are sandwiched between the solid electrolyte 1 and the support 3, and the peripheral portion of one side of the solid electrolyte 1 is the other side of the first support plate 3a. It is laminated
  • FIGS. 11 and 12 The ammonia sensor 100 according to the third embodiment differs from the first embodiment described above in that the plate-shaped sensor element 20 is provided with an ammonia oxidation catalyst layer 7 for oxidizing ammonia contained in the measurement target gas.
  • FIG. 11 shows an exploded perspective view of the ammonia sensor 100 according to the present embodiment
  • FIG. 12 shows a cross-sectional view of a part provided with the plate-like sensor element 20 in the longitudinal direction of the ammonia sensor 100 according to the present embodiment.
  • the ammonia sensor 100 is provided with a support 3 supporting the plate sensor element 20 on one side of the plate sensor element 20, and the plate electrode on which the first electrode C is formed.
  • the unburned oxidation catalyst layer 4 and the ammonia oxidation catalyst layer 7 are provided in a stacked state.
  • the ammonia oxidation catalyst layer 7 is formed so as to have the same dimensions as the unburned oxidation catalyst layer 4 in a plan view from the thickness direction of the solid electrolyte 1, and is laminated on the other side of the unburned oxidation catalyst layer 4.
  • the ammonia oxidation catalyst layer 7 is formed of a porous material through which the gas to be measured can flow, similar to the unburned oxidation catalyst layer 4. Accordingly, as shown in FIG. 12, the measurement target gas E flows in from one side of the ammonia oxidation catalyst layer 7, passes through the ammonia oxidation catalyst layer 7 and the unburned oxidation catalyst layer 4, and reaches one side of the plate-shaped sensor element 20. .
  • the ammonia oxidation catalyst layer 7 includes Co 3 O 4 , MnO 2 , V 2 O 5 , Ni-Al 2 O 3 , Fe-Al 2 O 3 , Mn-Al 2 O 3 , CuO-Al 2 O 3 , Fe 2 O 3 -Al 2 O 3 , Fe 2 O 3 -TiO 2 , Fe 2 O 3 -ZrO 2
  • the metal ion exchange zeolite is formed of at least one material.
  • the ammonia oxidation catalyst layer 7 it is possible to oxidize and remove some or all of the ammonia contained in the measurement target gas before the measurement target gas flows into the pair of electrodes 2. For example, by adjusting the material of the ammonia oxidation catalyst layer 7 and the thickness of the ammonia oxidation catalyst layer, it is possible to oxidize and remove ammonia at a predetermined concentration from the measurement target gas passing through the ammonia oxidation catalyst layer 7. Therefore, the ammonia sensor 100 provided with the ammonia oxidation catalyst layer 7 does not detect ammonia when the ammonia contained in the measurement target gas is below a predetermined concentration, and ammonia when the ammonia contained in the measurement target gas exceeds the predetermined concentration. Can be detected.
  • the ammonia sensor 100 according to the fourth embodiment differs from the first embodiment described above in that the second electrode D is formed including a material having a decomposition activity with respect to nitrogen oxide gas.
  • Specific materials having a decomposition activity with respect to the nitrogen oxide gas included in the second electrode D include NiO, CuO, Cr 2 O 3 , WO 3 , 2CuO-Cr 2 O 3 , LaNiO 3 , LaCoO 3 , and La 0. . 6 Sr 0 . 4 Co 0 . 8 Fe 0 . 2 O 3 , La 0.8 Sr 0.2 MnO 3 or La 0 . 85 Sr 0 . 15 CrO 3 Of at least one material.
  • the second electrode D is formed including at least one of an oxygen ion conductive solid electrolyte, alumina, zirconia, and glass. That is, each of the pair of electrodes 2 includes at least one or more of an oxygen ion conductive solid electrolyte, alumina, zirconia, and glass. Specifically, the second electrode D is formed including a solid electrolyte, alumina, and glass of oxygen ion conductivity.
  • the oxygen ion conductive solid electrolyte is preferably contained in the range of 2 to 25 Wt%
  • the alumina is preferably contained in the range of 5 to 60 Wt%.
  • the second electrode D contains LaCoO 3 , yttria stabilized zirconia, alumina, and glass in a weight ratio of 60: 10: 25: 5 as a material having decomposition activity with respect to nitrogen oxide gas.
  • the nitrogen dioxide as the nitrogen oxide gas included in the measurement target gas prevents the electromotive force generated by the electrode reaction oxidizing ammonia from being lowered, thereby reducing the amount of ammonia contained in the measurement target gas.
  • the concentration can be detected accurately.
  • the nitrogen dioxide acts on the electrode reaction of oxidizing ammonia at the first electrode C serving as the anode, thereby reducing the electromotive force generated between the pair of electrodes 2.
  • the second electrode D serving as a cathode contains a material having a decomposition activity with respect to nitrogen dioxide which is nitrogen oxide gas, an electrode reaction for decomposing oxygen ions from nitrogen dioxide contained in the measurement target gas is promoted. By the oxygen ions generated in the second electrode D electrode reaction, the electromotive force generated between the pair of electrodes 2 increases.
  • the decrease in the electromotive force generated by the action of nitrogen dioxide on the electrode reaction of the first electrode C and the increase in the electromotive force generated by the action of nitrogen dioxide in the electrode reaction of the second electrode D depend on the concentration of nitrogen dioxide contained in the gas to be measured. It is either an increase or a decrease. That is, the higher the concentration of nitrogen dioxide contained in the gas to be measured, the greater the decrease in electromotive force generated by the action of nitrogen dioxide on the electrode reaction of the first electrode C. Similarly, the nitrogen dioxide is caused by the electrode reaction action of the second electrode D. The increase in generated electromotive force also increases.
  • the second electrode such that the amount of decrease in the electromotive force generated by the action of the unit concentration of nitrogen dioxide in the first electrode C and the increase in the amount of increase in the electromotive force generated by the action of the unit concentration of nitrogen dioxide in the second electrode D are the same.
  • the mixing rate of the material having a decomposing activity with respect to nitrogen dioxide for D the reduction in the electromotive force generated by the action of the electrode reaction of the first electrode C with respect to the concentration of nitrogen oxides is achieved.
  • Nitrogen dioxide can be offset by an increase in the electromotive force generated by the action of the electrode reaction of the second electrode D.
  • the electromotive force generated between the pair of electrodes 2 is reduced. It can detect the density
  • a measuring device 12 for measuring at least one of a potential difference or a current between a pair of electrodes is provided between a pair of electrodes 2, but as shown in FIG. 13, a pair of electrodes Between 2, in addition to the measuring apparatus 12, the power supply apparatus which applies a constant current or voltage between a pair of electrodes 2 can be provided.
  • the power supply 11 can be provided in a state where the first electrode C becomes an anode and at the same time a second electrode D becomes a cathode.
  • the first electrode C is ZnO or SnO 2 , which is a material having a high oxidation activity with respect to ammonia. And at least one material of In 2 O 3 , which includes an oxygen ion conductive solid electrolyte, alumina, and glass, but is not limited thereto.
  • the first electrode C may be a ZnO material having a high oxidation activity with respect to ammonia; It may be formed of only at least one material of SnO 2 and In 2 O 3 .
  • the second electrode D is formed of only a noble metal, but the present invention is not limited thereto, and the second electrode D is formed of an oxygen ion conductive solid electrolyte, alumina, zirconia, and glass in addition to the noble metal. It may be formed including at least one.
  • the unburned oxidation catalyst layer 4 is a noble metal such as Pt, Au, Pd, Rh, Ir, Ru, or Ag, which oxidizes carbon monoxide and a hydrocarbon contained in the gas to be measured, It is formed of at least one material selected from a porous ceramic, etc., which is dispersed and supported, but is not limited thereto.
  • the non-flammable oxidation catalyst layer 4 may include a material for oxidizing ammonia included in the gas to be measured.
  • Co 3 O 4 , MnO 2 , V 2 O 5 , Ni-Al 2 O 3 , Fe-Al 2 O 3 , Mn-Al 2 O 3 , CuO-Al 2 O 3 , Fe At least one material of 2 O 3 -Al 2 O 3 , Fe 2 O 3 -TiO 2 , Fe 2 O 3 -ZrO 2, or a noble metal ion exchange zeolite may be used.
  • the ammonia included in the measurement target gas can be oxidized by the unburned oxidation catalyst layer 4.
  • one electrode 2a is used as the second electrode D and the other electrode 2b is used as the first electrode C.
  • the present invention is not limited thereto, and one electrode 2a is used as the first electrode C.
  • the other electrode 2b can be used as the second electrode D.
  • the right electrode 2c is the first electrode C
  • the left electrode 2d is the second electrode D
  • the present invention is not limited thereto
  • the right electrode 2c is the second electrode D
  • the left electrode is 2d can be used as the first electrode C.
  • the right electrode 2c and the left electrode 2d are provided on one side of the solid electrolyte 1
  • the present invention is not limited thereto, and the right electrode 2c and the left electrode 2d may be provided on the other side of the solid electrolyte 1.
  • a support body 3 supporting the plate sensor element 20 is provided on one side of the plate sensor element 20, and the non-flammable material is on the other side of the plate sensor element 20 on which the first electrode C is formed.
  • the oxidation catalyst layer 4 and the ammonia oxidation catalyst layer 7 are provided in a stacked state, the present invention is not limited thereto, and the unburned oxidation catalyst layer 4 and the ammonia oxidation catalyst layer 7 may be provided on one side of the plate sensor element 20.
  • the support body 3 can be provided in one side surface of the plate-shaped sensor element 20 in the state which the unburned oxidation catalyst layer 4 and the ammonia oxidation catalyst layer 7 are pinched
  • ammonia oxidation catalyst layer 7 is laminated on the unburned oxidation catalyst layer 4 included in the plate sensor element 20, the ammonia oxidation catalyst layer 7 is provided on the plate sensor element 20 without being limited thereto.
  • the unburned oxidation catalyst layer 4 can be laminated on the ammonia oxidation catalyst layer 7.
  • the flammable oxidation catalyst layer 4 and the ammonia oxidation catalyst layer 7 are provided on one side of the plate sensor element 20 in a stacked state, but the present invention is not limited thereto, and the flammable oxidation catalyst layer 4 is not provided. Instead, the ammonia oxidation catalyst layer 7 can be provided on one side of the plate sensor element 20. In this case, the ammonia oxidation catalyst layer 7 may include a material for oxidizing carbon monoxide and hydrocarbons included in the gas to be measured.
  • the ammonia oxidation catalyst layer 7 can oxidize carbon monoxide and hydrocarbons contained in the measurement target gas in addition to ammonia included in the measurement target gas.
  • the second electrode D is formed of an oxygen ion conductive solid electrolyte, alumina, zirconia, and glass, in addition to a material having a decomposition activity with respect to nitrogen oxide gas.
  • the second electrode D can be formed of only a material having a decomposition activity with respect to the nitrogen oxide gas, without limitation.
  • the non-flammable oxidation catalyst layer 4 is provided on the other side of the plate sensor element 20.
  • the present invention is not limited thereto, and the flammable oxidation catalyst layer 4 may be provided on one side of the plate sensor element 20.
  • the support 3 can be provided on one side of the plate-shaped sensor element 20 while the nonflammable oxidation catalyst layer 4 is sandwiched between one side of the plate-shaped sensor element 20 and the support 3, and the other side of the plate-shaped sensor element 20.
  • the support 3 can be provided in a side surface.
  • the support body 3 can be provided in the other side surface of the plate-shaped sensor element 20.
  • the said embodiment provided the support body 3 in one side surface of the plate-shaped sensor element 20, it is not limited to this, The support body 3 does not need to be provided. In this case, in order to connect the pair of electrodes 2 and the measuring device 12, the lead wire 5 and the heater terminal 9 can be provided in the solid electrolyte 1.
  • the solid electrolyte 1 is formed in a flat state, but is not limited thereto, and the solid electrolyte 1 may be formed in a curved state.
  • each of the pair of electrodes 2 is formed by including an oxygen ion conductive solid electrolyte, alumina, and glass, but the present invention is not limited thereto, and each pair of electrodes includes oxygen ions. And at least one or more of a conductive solid electrolyte, alumina, zirconia, and glass.
  • a conductive solid electrolyte, alumina, zirconia, and glass may include only an oxygen ion conductive solid electrolyte, and may include only an oxygen ion conductive solid electrolyte and alumina.
  • it may include an oxygen ion conductive solid electrolyte, zirconia, and glass.
  • the oxygen ion conductive solid electrolyte contained in each of the pair of electrodes 2 is yttria stabilized zirconia (YSZ), but is not limited thereto, and the oxygen ion conductivity included in the pair of electrodes 2
  • the solid electrolyte may be any of Scandia stabilized zirconia (ScSZ), samarium-doped ceria (GDC) or thorium dioxide (ThO 2 ).
  • an ammonia sensor capable of improving the ammonia concentration detection response can be provided.

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Abstract

La présente invention concerne un capteur d'ammoniac susceptible d'améliorer la réactivité de détection d'une concentration d'ammoniac. Le capteur d'ammoniac selon la présente invention comprend : un élément de capteur en forme de plaque dans lequel une paire d'électrodes (2) offrant différentes réactivités à l'ammoniac sont formées sur une surface en forme de plaque d'un électrolyte solide (1) offrant une conductivité ionique d'oxygène ; et un dispositif de mesure (12) permettant de mesurer une différence de potentiel et/ou de courant entre la paire d'électrodes (2), les deux électrodes de la paire d'électrodes (2) étant formées de manière à être exposées à un gaz à mesurer (E) ; l'électrolyte solide (1) étant formé de manière à être poreux ; et une pluralité d'orifices d'écoulement de gaz à travers lesquels le gaz à mesurer (E) s'écoule d'un côté de l'électrolyte solide (1) de l'élément de capteur en forme de plaque (20) vers l'autre côté opposé au premier côté étant formés dans la direction de l'épaisseur de l'élément de capteur en forme de plaque (20).
PCT/KR2018/003699 2017-03-30 2018-03-29 Capteur d'ammoniac Ceased WO2018182324A1 (fr)

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US11828210B2 (en) 2020-08-20 2023-11-28 Denso International America, Inc. Diagnostic systems and methods of vehicles using olfaction
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US11760169B2 (en) 2020-08-20 2023-09-19 Denso International America, Inc. Particulate control systems and methods for olfaction sensors
US11813926B2 (en) 2020-08-20 2023-11-14 Denso International America, Inc. Binding agent and olfaction sensor
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