JP5364063B2 - High pressure water electrolyzer - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a high-pressure water electrolysis device easily and economically formable, and capable of effectively reducing contact resistance. <P>SOLUTION: A unit cell 12 constituting this high-pressure water electrolysis device 10 includes: an electrolyte membrane/electrode structure 32; and an anode-side separator 34 and a cathode-side separator 36 sandwiching the electrolyte membrane/electrode structure 32 therebetween. The electrolyte membrane/electrode structure 32 includes: a solid polymer electrolyte membrane 38; and an anode-side power feeder 40 and a cathode-side power feeder 42 arranged on both the surfaces of the solid polymer electrolyte membrane 38. The cathode-side power feeder 42 is a porous conductive body formed integrally with a plate member 44 by depressurization plasma thermal spraying. A plate spring 46 is arranged on the plate member 44, and the plate spring 46 applies a load on the cathode-side power feeder 42 through the plate member 44. <P>COPYRIGHT: (C)2012,JPO&amp;INPIT

Description

  The present invention relates to a high-pressure water electrolyzer that electrolyzes water to generate oxygen on the anode side, and generates hydrogen at a higher pressure than oxygen on the cathode side.

  For example, hydrogen gas is used as a fuel gas for generating power from a fuel cell. Generally, when producing hydrogen gas, a water electrolysis apparatus is employed. This water electrolysis apparatus uses a solid polymer electrolyte membrane in order to electrolyze water and generate hydrogen (and oxygen). An electrode catalyst layer is provided on both sides of the solid polymer electrolyte membrane to constitute an electrolyte membrane / electrode structure, and a power feeder is provided on each side of the electrolyte membrane / electrode structure. Is configured.

  Therefore, in a state where a plurality of units are stacked, a voltage is applied to both ends in the stacking direction, and water is supplied to the anode-side power feeding body. For this reason, water is decomposed and hydrogen ions (protons) are generated on the anode side of the electrolyte membrane / electrode structure, and the hydrogen ions permeate the solid polymer electrolyte membrane and move to the cathode side to bond with electrons. Thus, hydrogen is produced. On the other hand, on the anode side, oxygen produced together with hydrogen is discharged from the unit with excess water.

  In this type of water electrolysis apparatus, a high pressure water electrolysis apparatus that generates hydrogen at a higher pressure (for example, several tens of MPa) than oxygen generated on the anode side may be employed on the cathode side. For example, as shown in FIG. 14, the high-pressure hydrogen production apparatus disclosed in Patent Document 1 includes a solid polymer membrane 1, cathode power supply 2a and anode power supply 2b provided opposite to each other on both sides thereof. , Separators 3a and 3b stacked on the power feeders 2a and 2b, and fluid passages 4a and 4b provided in the separators 3a and 3b and exposing the power feeders 2a and 2b.

  The solid polymer film 1, the power feeders 2a and 2b, and the separators 3a and 3b are sandwiched between end plates 6a and 6b via insulating members 5a and 5b stacked on the separators 3a and 3b.

  In the fluid passage 4a provided in the cathode side separator 3a, a titanium disc spring 7 for urging the cathode power feeding body 2a toward the solid polymer film 1 is disposed. A titanium punching plate 8 is interposed between the disc spring 7 and the solid polymer film 1. Thereby, even when the cathode side becomes a high pressure, the contact resistance between the solid polymer film 1 and the cathode power supply 2a does not increase.

JP 2006-70322 A

  By the way, in the high pressure hydrogen production apparatus described above, the disc spring 7, the punching plate 8, and the cathode power supply body 2 a, which are formed of different members, are stacked on the cathode side where high pressure hydrogen is generated.

  At that time, the punching plate 8 and the cathode power supply 2a need to manage their flatness and parallelism with high accuracy in order to make the load distribution in the surface uniform. Moreover, the contact surface between the punching plate 8 and the cathode power supply 2a may cause contact resistance due to an oxide film existing on the titanium surface.

  The present invention solves this type of problem, and an object thereof is to provide a high-pressure water electrolysis apparatus that can be configured simply and economically and that can effectively reduce contact resistance.

  The present invention includes a solid polymer electrolyte membrane, an anode-side power feeding body and a cathode-side power feeding body provided on both sides of the solid polymer electrolyte membrane, and opposed to the anode-side power feeding body. An anode separator that is supplied and electrolyzed with water to generate oxygen and disposed opposite to the cathode power supply, and electrolyzes the water to generate hydrogen at a pressure higher than that of oxygen A cathode-side separator, a plate member stacked on the cathode-side power feeder, and an elastic member that is disposed between the plate member and the cathode-side separator and applies a load to the plate member in the stacking direction. The present invention relates to a high-pressure water electrolysis apparatus provided.

  In this high-pressure water electrolysis apparatus, the cathode-side power feeder is a porous conductor that is integrally formed on the plate member by thermal spraying.

  In this high pressure water electrolysis apparatus, it is preferable that the plate member is provided with a flow path on a sprayed surface on which the porous conductor is integrally formed.

  Furthermore, in this high pressure water electrolysis apparatus, the thermal spraying is preferably reduced pressure plasma spraying.

  Furthermore, in this high pressure water electrolysis apparatus, it is preferable that the plate member is provided with a rib on the load application surface on which the elastic member is disposed.

  Moreover, in this high pressure water electrolysis apparatus, it is preferable that the plate member has a disk shape and the rib has a point-symmetric shape at the center of the plate member.

  Furthermore, in this high pressure water electrolysis apparatus, it is preferable that the rib is formed in a circular shape concentrically with the disk-shaped plate member.

  According to the present invention, the cathode-side power feeder is integrally formed on the plate member by thermal spraying. Therefore, in order to make the load by the elastic member uniform, the surface that requires parallelism management is greatly reduced. This simplifies the management of the parallelism at once, simplifies the work, and reduces the cost favorably.

  And since a cathode side electric power feeding body and a plate member are integrated, contact resistance is suppressed favorably compared with the case where these are comprised separately. Furthermore, the number of parts can be easily reduced. For this reason, it can comprise simply and economically, and also it becomes possible to reduce contact resistance effectively.

It is a perspective explanatory view of the high pressure water electrolysis apparatus concerning a 1st embodiment of the present invention. It is a partial cross section side view of the said high pressure water electrolysis apparatus. It is a disassembled perspective explanatory drawing of the unit cell which comprises the said high voltage | pressure water electrolysis apparatus. FIG. 4 is a cross-sectional view of the unit cell taken along line IV-IV in FIG. 3. It is a perspective explanatory drawing from the one surface side of the plate member which comprises the said high voltage | pressure water electrolysis apparatus. It is a perspective explanatory view from the other surface side of the plate member. It is a flowchart at the time of integrally forming the cathode side power feeding body on the plate member. It is explanatory drawing at the time of integrally forming the cathode side electric power feeding body in the said plate member. It is explanatory drawing of a low pressure plasma spraying process. It is a perspective explanatory view of the plate member which constitutes the high pressure water electrolysis apparatus concerning a 2nd embodiment of the present invention. It is a perspective explanatory view of the plate member which constitutes the high pressure water electrolysis apparatus concerning a 3rd embodiment of the present invention. It is a perspective explanatory view of the plate member which constitutes the high pressure water electrolysis apparatus concerning a 4th embodiment of the present invention. It is a perspective explanatory view of the plate member which constitutes the high pressure water electrolysis apparatus concerning a 5th embodiment of the present invention. It is explanatory drawing of the high pressure hydrogen production apparatus currently disclosed by patent document 1. FIG.

  As shown in FIGS. 1 and 2, in the high-pressure water electrolysis apparatus 10 according to the first embodiment of the present invention, a plurality of unit cells 12 are stacked in the vertical direction (arrow A direction) or in the horizontal direction (arrow B direction). The laminated body 14 is provided.

  At one end (upper end) in the stacking direction of the stacked body 14, a terminal plate 16a, an insulating plate 18a, and an end plate 20a are sequentially disposed upward. Similarly, a terminal plate 16b, an insulating plate 18b, and an end plate 20b are sequentially disposed on the other end (lower end) in the stacking direction of the stacked body 14 in a downward direction.

  The high-pressure water electrolysis apparatus 10 integrally clamps and holds the disc-shaped end plates 20a and 20b via, for example, four tie rods 22 extending in the arrow A direction. Note that the high-pressure water electrolysis apparatus 10 may employ a configuration in which the high-pressure water electrolysis apparatus 10 is integrally held by a box-like casing (not shown) including the end plates 20a and 20b as end plates. Moreover, although the high-pressure water electrolysis apparatus 10 has a substantially cylindrical shape as a whole, it can be set in various shapes such as a cubic shape.

  As shown in FIG. 1, terminal portions 24a and 24b are provided on the side portions of the terminal plates 16a and 16b so as to protrude outward. The terminal portions 24a and 24b are electrically connected to the power source 28 via the wirings 26a and 26b.

  As shown in FIGS. 2 to 4, the unit cell 12 includes a substantially disk-shaped electrolyte membrane / electrode structure 32, and an anode side separator 34 and a cathode side separator 36 that sandwich the electrolyte membrane / electrode structure 32. Prepare. The anode-side separator 34 and the cathode-side separator 36 have a substantially disk shape and are made of, for example, a carbon member or the like, or a steel plate, a stainless steel plate, a titanium plate, an aluminum plate, a plated steel plate, or a metal surface thereof. A metal plate subjected to an edible surface treatment is press-molded or cut and subjected to an anticorrosive surface treatment.

  The electrolyte membrane / electrode structure 32 includes, for example, a solid polymer electrolyte membrane 38 in which a perfluorosulfonic acid thin film is impregnated with water, and a circular anode-side power feeder provided on both surfaces of the solid polymer electrolyte membrane 38. 40 and a cathode side power supply body 42. The outer dimensions of the solid polymer electrolyte membrane 38 are set larger than the outer diameters of the anode-side power feeder 40 and the cathode-side power feeder 42 (see FIG. 4).

  An anode electrode catalyst layer 40a and a cathode electrode catalyst layer 42a are formed on both surfaces of the solid polymer electrolyte membrane 38. The anode electrode catalyst layer 40a uses, for example, a Ru (ruthenium) -based catalyst, while the cathode electrode catalyst layer 42a uses, for example, a platinum catalyst.

  The anode side power feeding body 40 is constituted by, for example, a sintered body (porous conductor) of spherical atomized titanium powder. The anode-side power supply body 40 is provided with a smooth surface portion that is etched after grinding, and the porosity is set within a range of 10% to 50%, more preferably 20% to 40%.

  As will be described later, the cathode-side power feeder 42 is a porous conductor integrally formed on the plate member 44 by, for example, low-pressure plasma spraying using pure titanium particles as a spraying material. The porosity of the porous conductor is set within a range of 10% to 50%.

  The plate member 44 has a disk shape, and an elastic member, for example, four disc springs 46 are disposed on the load application surface 44b opposite to the thermal spray surface 44a on which the cathode side power supply body 42 is sprayed. The The disc spring 46 applies a load to the cathode-side power feeder 42 via a plate member 44 that is a disc spring holder.

  As shown in FIG. 3, a first protrusion 48 a, a second protrusion 48 b, and a third protrusion 48 c that protrude outward in the separator surface direction are formed on the outer periphery of the unit cell 12. The first protrusion 48a is provided with a water supply communication hole 50a that communicates with each other in the direction of arrow A that is the stacking direction and supplies water (pure water) that is the first fluid.

  The second projecting portion 48b is provided with a discharge communication hole 50b that communicates with each other in the direction of the arrow A and discharges oxygen generated by the reaction and used water. The third protrusion 48c is provided with a hydrogen communication hole 50c that is in communication with each other in the direction of arrow A, which is the stacking direction, for flowing high-pressure hydrogen generated by the reaction.

  As shown in FIGS. 3 and 4, the anode-side separator 34 is provided with a supply passage 52a that communicates with the water supply communication hole 50a and a discharge passage 52b that communicates with the discharge communication hole 50b. A first flow path 54 communicating with the supply passage 52a and the discharge passage 52b is provided on the surface 34a of the anode separator 34 facing the electrolyte membrane / electrode structure 32. The first flow path 54 is provided in a range corresponding to the contact area range of the anode-side power feeding body 40.

  The cathode separator 36 is provided with a discharge passage 56 that communicates with the hydrogen communication hole 50c. A second flow path 58 communicating with the discharge passage 56 is formed on the sprayed surface 44 a of the plate member 44. The second flow path 58 is provided in a range corresponding to the contact area range of the cathode-side power feeder 42.

  As shown in FIG. 5, a plurality of linear grooves 58 a constituting the second flow path 58 are formed in parallel with each other on the spray surface 44 a of the plate member 44. The space between the linear grooves 58a functions as a rib that reinforces the plate member 44. Note that the second flow path 58 may be formed in the porous space inside the cathode power supply body 42 without providing the linear groove portion 58a on the sprayed surface 44a.

  As shown in FIG. 6, the load application surface 44 b of the plate member 44 has a point-symmetric shape at the center of the plate member 44, that is, a pair of ribs 59 a extending in the diametrical direction and orthogonal to each other, and the plate A circular rib 59b is formed concentrically with the member 44. Four disc springs 46 are arranged between the ribs 59a and 59b.

  The seal members 60a and 60b are integrated with each other around the outer peripheral ends of the anode side separator 34 and the cathode side separator 36. The seal members 60a and 60b include, for example, EPDM, NBR, fluorine rubber, silicone rubber, fluorosilicone rubber, butyl rubber, natural rubber, styrene rubber, chloroprene, acrylic rubber, or other seal materials, cushion materials, or packing materials. Used.

  As shown in FIGS. 3 and 4, the surface 34 a of the anode-side separator 34 facing the electrolyte membrane / electrode structure 32 circulates outward from the first flow path 54 and the anode-side power feeding body 40, and thus the second seal. A second seal groove 64a for disposing the member 62a is formed.

  On the surface 34a, a third seal member 62b, a fourth seal member 62c, and a fifth seal member 62d are arranged around the outside of the water supply communication hole 50a, the discharge communication hole 50b, and the hydrogen communication hole 50c. A third seal groove 64b, a fourth seal groove 64c, and a fifth seal groove 64d are formed. The second seal member 62a to the fifth seal member 62d are, for example, O-rings.

  On the surface 36a of the cathode side separator 36 facing the electrolyte membrane / electrode structure 32, the second seal 58a is disposed for circulating the second flow path 58 and the cathode side power supply body 42 outward. One seal groove 68a is formed.

  On the surface 36a, the third seal member 66b, the fourth seal member 66c, and the fifth seal member 66d are disposed around the outside of the water supply communication hole 50a, the discharge communication hole 50b, and the hydrogen communication hole 50c. A third seal groove 68b, a fourth seal groove 68c, and a fifth seal groove 68d are formed. The first seal member 66a, the third seal member 66b to the fifth seal member 66d are, for example, O-rings.

  The second seal groove 64a that goes around the outside of the anode-side power supply body 40 and the first seal groove 68a that goes around the outside of the cathode-side power supply body 42 are solid polymer in the separator stacking direction (arrow A direction). The positions are set different from each other with the electrolyte membrane 38 interposed therebetween.

  The fifth seal groove 64d that circulates outward from the hydrogen communication hole 50c and the fifth seal groove 68d that circulates outward from the hydrogen communication hole 50c sandwich each other across the solid polymer electrolyte membrane 38 in the direction of arrow A. Set to a different position.

  As shown in FIGS. 1 and 2, pipes 76a, 76b and 76c communicating with the water supply communication hole 50a, the discharge communication hole 50b and the hydrogen communication hole 50c are connected to the end plate 20a. Although not shown, the pipe 76c is provided with a back pressure valve (or electromagnetic valve), and the pressure of hydrogen generated in the hydrogen communication hole 50c can be maintained at a high pressure. A pressing force is applied between the end plates 20 a and 20 b by a pressing force applying device (not shown), and the end plates 20 a and 20 b are tightened via the tie rods 22 in this state.

  Next, an operation for manufacturing the cathode-side power feeder 42 integrally with the plate member 44 will be described with reference to a flowchart shown in FIG.

  First, as shown in FIG. 8, a base plate 80 that serves as a base of the plate member 44 is manufactured (step S1). A plurality of linear grooves 58a constituting the second flow path 58 are formed on the sprayed surface 44a of the base plate 80, while ribs 59a and 59b are formed on the load applying surface 44b.

  In addition, since the spraying surface 44a is sprayed, precision is not necessary, and the load applying surface 44b is not a surface to which the disc spring 46 directly applies a load, and similarly, precision is unnecessary. For this reason, the base plate 80 can be cast-molded integrally with the linear groove portion 58a and the ribs 59a, 59b.

  Next, a thermal spraying process is performed on the thermal spray surface 44a of the base plate 80 (step S2). This thermal spraying process is a low pressure plasma spraying process. Specifically, as shown in FIG. 9, a base plate 80 is disposed in a vacuum chamber 90, and in this vacuum chamber 90, a thermal spray gun 92 is applied to the base plate 80. opposite. The spray gun 92 is provided with a powder material inlet 94, a working gas inlet 96, a cooling water inlet 98a, and a cooling water outlet 98b.

  Therefore, in the vacuum chamber 90, spherical titanium powder (pure titanium particles) 100 is supplied from the powder material inlet 94 of the spray gun 92, and an inert gas such as argon or helium is supplied from the working gas inlet 96. In this state, a plasma jet is generated, and the spherical titanium powder 100 is introduced into the plasma jet, whereby the molten particles of the spherical titanium powder 100 are sprayed onto the sprayed surface 44a of the base plate 80.

  At this time, since plasma spraying is performed in a vacuum or in an inert gas, an oxide film is not formed on the surface of the titanium particles. Therefore, film formation is performed in a low melting state, and the porous power supply layer 102 having a porosity set within a range of 10% to 50%, more preferably 20% to 40% is reliably formed. Is done.

  In addition, ribs 59 a and 59 b are provided on the load application surface 44 b of the base plate 80. Accordingly, the ribs 59a and 59b can have a function of satisfactorily suppressing the deformation of the base plate 80 due to the heat generated during the thermal spraying.

  When the thermal spraying process ends, the process proceeds to step S3, and the surface of the power supply layer 102 is subjected to a smoothing process by grinding or cutting (see FIG. 8). On the other hand, the load application surface 44b of the base plate 80 is subjected to a smoothing process by grinding or cutting on the tip surfaces of the ribs 59a and 59b. Thereby, the desired parallelism can be ensured between the surface of the power supply layer 102 and the tip surfaces of the ribs 59a and 59b. In this smoothing process, clogging occurs due to grinding or the like, and an etching process is performed after the smoothing process (step S4).

  Specifically, a mixed solution of 10 ml of nitric acid, 10 ml of 10% hydrofluoric acid and 180 ml of pure water is used as an etching solution, and etching is performed at room temperature with an etching time of 90 seconds. Next, cleaning is performed. For this reason, the plate member 44 in which the cathode side power feeding body 42 is integrated is manufactured. Note that the etching process may be performed as necessary and may be deleted.

  The operation of the high-pressure water electrolysis apparatus 10 configured as described above will be described below.

  As shown in FIG. 1, water is supplied from a pipe 76 a to the water supply communication hole 50 a of the high-pressure water electrolysis apparatus 10, and the power supply 28 is electrically connected to the terminal portions 24 a and 24 b of the terminal plates 16 a and 16 b. A voltage is applied via Therefore, as shown in FIG. 3, in each unit cell 12, water is supplied from the water supply communication hole 50 a to the first flow path 54 of the anode-side separator 34, and this water flows along the anode-side power feeder 40. Moving.

  Accordingly, water is decomposed by electricity in the anode electrode catalyst layer 40a, and hydrogen ions, electrons, and oxygen are generated. Hydrogen ions generated by this anodic reaction permeate the solid polymer electrolyte membrane 38 and move to the cathode electrode catalyst layer 42a side, and combine with electrons to obtain hydrogen.

  For this reason, hydrogen flows along the inside of the cathode side power supply body 42 and the second flow path 58 formed in the plate member 44. The hydrogen is maintained at a pressure higher than that of the water supply communication hole 50a, and can flow out of the high pressure water electrolysis apparatus 10 through the hydrogen communication hole 50c. On the other hand, oxygen generated by the reaction and used water flow through the first flow path 54, and these are discharged to the outside of the high-pressure water electrolysis apparatus 10 along the discharge communication hole 50b.

  In this case, in the first embodiment, the cathode-side power feeding body 42 is integrally formed on the sprayed surface 44a of the plate member 44 by spraying. For this reason, in order to make the load by the disc spring 46 uniform, the surfaces that need to be managed in parallelism may be substantially only the tip surfaces of the ribs 59a and 59b of the plate member 44 and the surface of the cathode side power supply body 42. Therefore, the parallelism management can be simplified at once, the work can be simplified easily, and the cost can be advantageously reduced.

  In addition, since the cathode-side power feeding body 42 and the plate member 44 are integrated, the contact resistance is favorably suppressed as compared with a case where these are configured separately. In particular, since plasma spraying is performed in a vacuum or in an inert gas, an oxide film is not formed on the surface of the titanium particles, and the contact resistance is reduced. Furthermore, the number of parts can be easily reduced. As a result, there is an advantage that it can be configured simply and economically, and the contact resistance can be effectively reduced.

  In addition, after the thermal spraying process is finished, the surface of the power supply layer 102 is smoothed. For this reason, it can suppress as much as possible that the solid polymer electrolyte membrane 38 is damaged by the surface of the electric power feeder layer 102. Next, the clogging is satisfactorily removed by performing an etching process on the surface of the power supply layer 102.

  FIG. 10 is a perspective explanatory view of the plate member 110 constituting the high-pressure water electrolysis apparatus according to the second embodiment of the present invention.

  A plurality of linear grooves 58b and a plurality of ring-shaped grooves 58c constituting the second flow path 58 are formed on the sprayed surface 110a of the plate member 110. The linear grooves 58b are arranged radially from the center of the plate member 110, and the ring-shaped grooves 58c are arranged concentrically with the plate member 110. The plate member 110 has a function as a reinforcing rib except for the linear groove portion 58b and the ring-shaped groove portion 58c.

  FIG. 11 is a perspective explanatory view of the plate member 120 constituting the high-pressure water electrolysis apparatus according to the third embodiment of the present invention.

  A plurality of linear grooves 58d and a plurality of linear grooves 58e constituting the second flow path 58 are formed on the sprayed surface 120a of the plate member 120. The linear groove portions 58d and 58e are arranged in a lattice pattern, and the plate member 120 has a function as a reinforcing rib except for the linear groove portions 58d and 58e.

  In the second and third embodiments configured as described above, plate members 110 and 120 are used in place of the plate member 44, respectively, and the same effect as in the first embodiment can be obtained.

  FIG. 12 is an explanatory perspective view of the plate member 130 constituting the high-pressure water electrolysis apparatus according to the fourth embodiment of the present invention.

  The load application surface 130b opposite to the thermal spraying surface 130a of the plate member 130 has a point-symmetric shape around the center of the plate member 130, that is, three ribs 59c extending in the diameter direction, and the plate member 44 Circular ribs 59b are formed on the concentric circles. Six disc springs 46 are arranged between the ribs 59c and 59b.

  FIG. 13 is a perspective explanatory view of a plate member 140 constituting the high-pressure water electrolysis apparatus according to the fifth embodiment of the present invention.

  Two circular ribs 59d and 59b are formed concentrically with the plate member 140 on the load applying surface 140b opposite to the sprayed surface 140a of the plate member 140. One disc spring 46 is disposed in the rib 59d, and eight disc springs 46 are disposed between the ribs 59d and 59b.

  In the fourth and fifth embodiments configured as described above, plate members 130 and 140 are used in place of the plate member 44, respectively, and the same effect as in the first embodiment can be obtained.

DESCRIPTION OF SYMBOLS 10 ... High pressure water electrolysis apparatus 12 ... Unit cell 14 ... Laminate body 16a, 16b ... Terminal plate 18a, 18a ... Insulation plate 20a, 20b ... End plate 24a, 24b ... Terminal part 28 ... Power supply 32 ... Electrolyte membrane and electrode structure 34 ... anode-side separator 36 ... cathode-side separator 38 ... solid polymer electrolyte membrane 40 ... anode-side power feeder 42 ... cathode-side power feeders 44, 110, 120, 130, 140 ... plate members
44a, 110a, 120a, 130a, 140a ... sprayed surfaces 44b, 130b, 140b ... load application surface 46 ... disc spring 50a ... water supply communication hole 50b ... discharge communication hole 50c ... hydrogen communication hole 54, 58 ... flow path 58a, 58b 58d, 58e ... linear groove 58c ... ring-shaped groove 59a, 59b, 59c, 59d ... ribs

Claims (6)

A solid polymer electrolyte membrane;
An anode-side power feeding body and a cathode-side power feeding body for electrolysis provided on both sides of the solid polymer electrolyte membrane;
An anode-side separator that is disposed to face the anode-side power feeder, is supplied with water, and electrolyzes the water to generate oxygen;
A cathode-side separator that is disposed opposite to the cathode-side power feeder and generates hydrogen having a pressure higher than that of oxygen by electrolyzing the water;
A plate member laminated on the cathode-side power feeder;
An elastic member that is disposed between the plate member and the cathode-side separator and applies a load to the plate member in a stacking direction;
A high pressure water electrolysis apparatus comprising:
The high-pressure water electrolysis apparatus according to claim 1, wherein the cathode-side power supply body is a porous conductor integrally formed on the plate member by thermal spraying.   2. The high pressure water electrolysis apparatus according to claim 1, wherein the plate member is provided with a flow path on a sprayed surface on which the porous conductor is integrally formed.   3. The high pressure water electrolysis apparatus according to claim 1, wherein the thermal spraying is low pressure plasma spraying.   The high pressure water electrolysis apparatus according to any one of claims 1 to 3, wherein the plate member is provided with a rib on a load application surface on which the elastic member is disposed. The high pressure water electrolysis apparatus according to any one of claims 1 to 4, wherein the plate member has a disk shape,
The high-pressure water electrolysis apparatus according to claim 1, wherein the rib has a point-symmetric shape at the center of the plate member.   6. The high-pressure water electrolysis apparatus according to claim 1, wherein the rib is formed in a circular shape concentrically with the disk-shaped plate member. 7.

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