WO2023105909A1 - Dispositif d'électrolyse de l'eau - Google Patents

Dispositif d'électrolyse de l'eau Download PDF

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Publication number
WO2023105909A1
WO2023105909A1 PCT/JP2022/037689 JP2022037689W WO2023105909A1 WO 2023105909 A1 WO2023105909 A1 WO 2023105909A1 JP 2022037689 W JP2022037689 W JP 2022037689W WO 2023105909 A1 WO2023105909 A1 WO 2023105909A1
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Prior art keywords
catalyst layer
separator member
gas diffusion
water electrolysis
electrolysis device
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PCT/JP2022/037689
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English (en)
Japanese (ja)
Inventor
大樹 安藤
達也 常木
拓人 櫛
将史 河村
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東京瓦斯株式会社
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Publication of WO2023105909A1 publication Critical patent/WO2023105909A1/fr

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    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25B—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTION OF COMPOUNDS OR NON-METALS; APPARATUS THEREFOR
    • C25B1/00—Electrolytic production of inorganic compounds or non-metals
    • C25B1/01—Products
    • C25B1/02—Hydrogen or oxygen
    • C25B1/04—Hydrogen or oxygen by electrolysis of water
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25B—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTION OF COMPOUNDS OR NON-METALS; APPARATUS THEREFOR
    • C25B13/00—Diaphragms; Spacing elements
    • C25B13/02—Diaphragms; Spacing elements characterised by shape or form
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25B—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTION OF COMPOUNDS OR NON-METALS; APPARATUS THEREFOR
    • C25B13/00—Diaphragms; Spacing elements
    • C25B13/04—Diaphragms; Spacing elements characterised by the material
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25B—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTION OF COMPOUNDS OR NON-METALS; APPARATUS THEREFOR
    • C25B13/00—Diaphragms; Spacing elements
    • C25B13/04—Diaphragms; Spacing elements characterised by the material
    • C25B13/05—Diaphragms; Spacing elements characterised by the material based on inorganic materials
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25B—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTION OF COMPOUNDS OR NON-METALS; APPARATUS THEREFOR
    • C25B15/00—Operating or servicing cells
    • C25B15/08—Supplying or removing reactants or electrolytes; Regeneration of electrolytes
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25B—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTION OF COMPOUNDS OR NON-METALS; APPARATUS THEREFOR
    • C25B9/00—Cells or assemblies of cells; Constructional parts of cells; Assemblies of constructional parts, e.g. electrode-diaphragm assemblies; Process-related cell features
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25B—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTION OF COMPOUNDS OR NON-METALS; APPARATUS THEREFOR
    • C25B9/00—Cells or assemblies of cells; Constructional parts of cells; Assemblies of constructional parts, e.g. electrode-diaphragm assemblies; Process-related cell features
    • C25B9/17—Cells comprising dimensionally-stable non-movable electrodes; Assemblies of constructional parts thereof
    • C25B9/19—Cells comprising dimensionally-stable non-movable electrodes; Assemblies of constructional parts thereof with diaphragms
    • C25B9/23—Cells comprising dimensionally-stable non-movable electrodes; Assemblies of constructional parts thereof with diaphragms comprising ion-exchange membranes in or on which electrode material is embedded
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/30—Hydrogen technology
    • Y02E60/36—Hydrogen production from non-carbon containing sources, e.g. by water electrolysis

Definitions

  • the present invention relates to water electrolysis devices.
  • the structure of the cell stack has also been developed, and various technologies have been proposed for the cell structure including the electrolyte membrane, anode, cathode, and separator. (See Patent Document 1, for example).
  • the present invention has been made in consideration of the above facts, and an object of the present invention is to provide a water electrolysis device capable of suppressing manufacturing costs.
  • a water electrolysis device includes an electrolyte membrane in which an anode catalyst layer is laminated on one surface of an electrolyte layer and a cathode catalyst layer is laminated on the other surface thereof; are arranged at an average pitch of 20 ⁇ m or more and 500 ⁇ m or less on the surface, and the protrusions formed between the adjacent recesses of the uneven pattern are arranged in contact with the anode catalyst layer, and the anode catalyst layer and a conductive separator member forming a gas diffusion path between.
  • a water electrolysis device includes an electrolyte membrane in which an anode catalyst layer is laminated on one side of an electrolyte layer and a cathode catalyst layer is laminated on the other side, and convexes with an average distance between the tops of 10 ⁇ m or more and 250 ⁇ m or less
  • An uneven pattern in which portions are arranged at an average pitch of 20 ⁇ m or more and 500 ⁇ m or less is integrally formed on the surface, the convex portions of the uneven pattern are arranged in contact with the anode catalyst layer, and a gas diffusion path is formed between the anode catalyst layer and the uneven pattern. and a conductive separator member.
  • the uneven pattern is integrally formed on the surface of the conductive separator member, and the convex portions of the uneven pattern are arranged in contact with the anode catalyst layer, and are in contact with the anode catalyst layer.
  • a gas diffusion path is constructed between them.
  • concave portions having an average opening width of 10 ⁇ m or more and 250 ⁇ m or less or convex portions having an average interval between apexes of 10 ⁇ m or more and 250 ⁇ m or less are arranged at an average pitch of 20 ⁇ m or more and 500 ⁇ m or less. can be diffused.
  • the uneven pattern has an average pitch smaller than the thickness of the separator member.
  • the average pitch of the uneven pattern smaller than the thickness of the separator member, it is possible to maintain ease of manufacture while ensuring gas diffusibility.
  • a water electrolysis device includes an electrolyte membrane in which an anode catalyst layer is laminated on one side of an electrolyte layer and a cathode catalyst layer is laminated on the other side of the electrolyte layer, and groove-shaped recesses that are uneven in the thickness direction are adjacent to each other.
  • a water electrolysis device includes an electrolyte membrane in which an anode catalyst layer is laminated on one side of an electrolyte layer and a cathode catalyst layer is laminated on the other side of the electrolyte layer, and projections that are convex in the thickness direction and are separated from each other are formed.
  • a concave-convex pattern in which concave portions are formed between the adjacent convex portions is integrally formed, the convex portions of the concave-convex pattern are disposed in contact with the anode catalyst layer, and gas diffusion paths are provided between the anode catalyst layer and the anode catalyst layer. wherein the average pitch of the uneven pattern is smaller than the thickness of the separator member.
  • the contact ratio with the electrolyte membrane per unit area in the uneven pattern is 40% or more and 85% or less.
  • water electrolysis device According to the water electrolysis device according to the sixth aspect, it is possible to ensure good electrical conductivity and maintain gas diffusion between the separator member and the anode catalyst layer.
  • the projections are circular.
  • a gas diffusion path can be configured between the anode catalyst layer and the convex portion of the concave-convex pattern by making the convex portion circular.
  • the concave portion has a groove shape.
  • the separator member is formed with a main portion having a flow path resistance smaller than that of the uneven pattern from the upstream side to the downstream side of the gas diffusion path.
  • the separator member is formed with a main flow portion having a lower flow path resistance than the uneven pattern. Since the main flow portion extends from the upstream side to the downstream side of the gas diffusion path, water and oxygen flow from the gas diffusion flow path into the main flow portion, thereby improving the flow of water and oxygen.
  • the separator member is made of titanium.
  • oxidation resistance can be improved by making the separator member made of titanium.
  • FIG. 4 is a plan view of an anode-side separator member of the water electrolysis device according to the first embodiment
  • FIG. FIG. 2B is a cross-sectional view of the anode-side separator member of the water electrolysis device according to the first embodiment taken along line 2-2 in FIG. 2A.
  • 4 is a plan view of a cathode-side separator member of the water electrolysis device according to the first embodiment;
  • FIG. 3B is a cross-sectional view of the cathode-side separator member of the water electrolysis device according to the first embodiment taken along line 3-3 of FIG. 3A.
  • FIG. 4 is a plan view of an anode-side separator member of a water electrolysis device according to a modification of the first embodiment;
  • FIG. 4B is a cross-sectional view along line 4-4 of FIG. 4A of the anode-side separator member of the water electrolysis device according to the modification of the first embodiment.
  • FIG. 8 is a plan view of an anode-side separator member of a water electrolysis device according to a second embodiment;
  • FIG. 5B is a cross-sectional view of the anode-side separator member of the water electrolysis device according to the second embodiment taken along line 5-5 in FIG. 5A.
  • FIG. 8 is a plan view of a cathode-side separator member of a water electrolysis device according to a second embodiment;
  • FIG. 6B is a cross-sectional view of the cathode-side separator member of the water electrolysis device according to the second embodiment taken along line 6-6 in FIG. 6A.
  • FIG. 10 is a diagram showing an example of a gas diffusion part of a water electrolysis device according to another embodiment;
  • FIG. 10 is a diagram showing an example of a gas diffusion part of a water electrolysis device according to another embodiment;
  • FIG. 10 is a diagram showing an example of a gas diffusion part of a water electrolysis device according to another embodiment; It is a figure which shows the schematic cross-sectional structure of the water electrolysis apparatus which concerns on other embodiment.
  • FIG. 1 shows a schematic cross-section of a cell 20 of the water electrolysis device 10. As shown in FIG.
  • the cell 20 has an electrolyte membrane 21 .
  • the electrolyte membrane 21 is formed by stacking an anode catalyst layer 24 on one side of the electrolyte layer 22 and a cathode catalyst layer 34 on the other side.
  • a separator member 26 is laminated on the anode catalyst layer 24 of the electrolyte membrane 21
  • a separator member 36 is laminated on the cathode catalyst layer 34 .
  • the electrolyte layer 22 has a rectangular shape, and a carbon-fluorine polymer film, a carbon-fluorine polymer film, or the like can be used.
  • the anode catalyst layer 24 covers the inner peripheral side narrower than the outer periphery of one surface of the electrolyte membrane 21, and can use an Ir-based catalyst or the like.
  • the cathode catalyst layer 34 covers the inner circumference narrower than the outer circumference of the other surface of the electrolyte membrane 21, and can use a Pt/carbon catalyst or the like.
  • a frame-shaped anode seal layer 25 is laminated on the anode catalyst layer 24 side of the electrolyte membrane 21 .
  • the anode seal layer 25 is formed on the outer periphery of the anode catalyst layer 24 of the electrolyte layer 22, as shown in FIG.
  • An anode opening 25A is formed within the frame of the anode seal layer 25, and the anode catalyst layer 24 and a gas diffusion portion 27 of a separator member 26, which will be described later, are arranged in the anode opening 25A.
  • the anode seal layer 25 is in close contact with the electrolyte layer 22 and the separator member 26 to provide a seal therebetween.
  • the anode seal layer 25 can be made of resin or rubber material.
  • a separator member 26 is laminated on the anode seal layer 25 .
  • the separator member 26 has a rectangular plate shape, and a gas diffusion portion 27 is integrally formed on the surface on the anode catalyst layer 24 side.
  • the gas diffusion part 27 is formed at a position corresponding to the anode catalyst layer 24 in plan view, and has the same shape as the anode catalyst layer 24 in plan view, and the wall part 28 is formed in a square shape in plan view.
  • the gas diffusion portion 27 has a circular projection 27B formed on the entire surface thereof in a plan view.
  • the convex portion 27B has a top portion 27AP that is flush with the surface of the separator member 26 (based on the thickness surface of the portion where the uneven pattern is not formed).
  • a concave portion 27A recessed from the surface of the separator member 26 is formed between the adjacent convex portions 27B (portion where the convex portion 27B is not formed).
  • the gas diffusion part 27 is thus integrally formed with an uneven pattern on its surface.
  • integrated formed as used herein means that it is composed of one member rather than separate members.
  • the convex portion 27B is formed apart from the adjacent convex portion 27B, and the top portion 27AP of the convex portion 27B is flat. By flattening the top portion 27AP in this manner, the contact area with the anode catalyst layer 24 can be increased.
  • An average interval D1 between adjacent convex portions 27B is set to 10 ⁇ m or more and 250 ⁇ m or less.
  • the average opening width D2 (same as D1 in the present embodiment) of the concave portion 27A in plan view is set to 10 ⁇ m or more and 250 ⁇ m or less.
  • the average pitch P1 of the uneven pattern formed by the convex portions 27B and the concave portions 27A is set to 20 ⁇ m or more and 500 ⁇ m or less.
  • the average opening width D2 is less than 10 ⁇ m, and the average pitch P1 is less than 20 ⁇ m, manufacturing becomes difficult. If the average interval D1, the average opening diameter D2 exceeds 250 ⁇ m, and the average pitch P1 exceeds 500 ⁇ m, the diffusion of gas becomes insufficient and the performance deteriorates.
  • the average interval D1 and the average opening width D2 are preferably 10 ⁇ m or more and 150 ⁇ m or less.
  • the depth B1 of the concave portion 27A is set to be shallower than the thickness T1 of the separator member 26, and the average pitch P1 of the uneven pattern is set to be smaller than the thickness T1.
  • the convex portion 27B is arranged in contact with the anode catalyst layer 24 of the electrolyte membrane 21 .
  • the convex portions 27B are maintained in contact with the anode catalyst layer 24 to ensure electrical conductivity, but the concave portions 27A are arranged so as to surround each convex portion 27B, and the fluid in the concave portions 27A is maintained. It is possible to move.
  • the contact ratio with the anode catalyst layer 24 per unit area in the gas diffusion part 27 is preferably 40% or more and 85% or less in consideration of ensuring electrical conductivity and maintaining gas diffusibility.
  • the average interval D1, the average opening width D2, the average pitch P1 of the concave-convex pattern, and the depth B1 can be measured using a scanning electron microscope, an optical microscope, images acquired through these, and the like.
  • a gas diffusion path 27C is formed between the inner anode catalyst layer 24 surrounded by the anode seal layer 25 and the concave portion 27A of the gas diffusion portion 27 .
  • Water is supplied to the gas diffusion path 27C from a water flow path (not shown) provided at one end of the gas diffusion path 27C, and oxygen is supplied from an oxygen flow path (not shown) provided at the other end of the gas diffusion path 27C. sent out.
  • Titanium, stainless steel, and carbon can be used as the separator member 26 .
  • oxygen is generated on the anode side, so it is preferable to use titanium, which is a material with high oxidation resistance, in order to suppress oxidation.
  • the sharpening process refers to a processing method for sharpening the surface of the plate material by applying a blade in an oblique direction to the surface of the plate material, similar to the processing method used when forming the uneven shape of a grater.
  • a frame-shaped cathode seal layer 35 is laminated on the cathode catalyst layer 34 side of the electrolyte membrane 21 .
  • the cathode seal layer 35 is formed on the outside of the cathode catalyst layer 34 of the electrolyte layer 22, as shown in FIG.
  • a cathode opening 35A is formed within the frame of the cathode seal layer 35, and the cathode catalyst layer 34 and a gas diffusion portion 37 of a separator member 36, which will be described later, are arranged in the cathode opening 35A.
  • the cathode seal layer 35 is in close contact with the electrolyte layer 22 and the separator member 36 to provide a seal therebetween.
  • the cathode seal layer 35 can be made of resin or rubber material.
  • a separator member 36 is laminated on the cathode seal layer 35 .
  • the separator member 36 has a rectangular plate shape, and a gas diffusion portion 37 is integrally formed on the surface on the cathode catalyst layer 34 side.
  • the gas diffusion part 37 is formed at a position corresponding to the cathode catalyst layer 34 in plan view, and has the same shape as the cathode catalyst layer 34 in plan view, and the wall part 28 is formed in a square shape in plan view. there is ing.
  • the gas diffusion portion 37 has a circular convex portion 37B formed on the entire surface in a plan view.
  • the convex portion 37B has a top portion 37AP that is flush with the surface of the separator member 36 .
  • a concave portion 37A is formed between the adjacent convex portions 37B (portion where the convex portion 37B is not formed). The gas diffusion part 37 is thus integrally formed with an uneven pattern on its surface.
  • the convex portion 37B is formed apart from the adjacent convex portion 37B, and the top portion 37AP of the convex portion 37B is flat. By flattening the top portion 37AP in this way, the contact area with the cathode catalyst layer 34 can be increased.
  • An average interval D3 between adjacent recesses 37A is set to 10 ⁇ m or more and 250 ⁇ m or less. Further, the average opening width D4 (same as D3 in the present embodiment) of the concave portion 37A in plan view is set to 10 ⁇ m or more and 250 ⁇ m or less.
  • the average pitch P2 of the uneven pattern formed by the convex portions 37B and the concave portions 37A is set to 20 ⁇ m or more and 500 ⁇ m or less.
  • the average aperture width D4 is less than 10 ⁇ m, and the average pitch P2 is less than 20 ⁇ m, manufacturing becomes difficult. If the average interval D3, the average opening width D4 exceeds 250 ⁇ m, and the average pitch P2 exceeds 500 ⁇ m, the diffusion of gas becomes insufficient and the performance deteriorates.
  • the average interval D3 and the average opening width D4 are preferably 10 ⁇ m or more and 150 ⁇ m or less.
  • the average interval D3, the average opening width D4, the average pitch P2 of the concave-convex pattern, and the depth B2 can be measured using a scanning electron microscope, an optical microscope, images obtained through these, and the like.
  • the depth B2 of the concave portion 37A is set shallower than the thickness T2 of the separator member 36, and the average pitch P2 of the uneven pattern is set smaller than the thickness T2.
  • the convex portion 37B is arranged in contact with the cathode catalyst layer 34 of the electrolyte membrane 21 .
  • the protrusions 37B maintain contact with the cathode catalyst layer 34 to ensure electrical conductivity, but the recesses 37A are arranged so as to surround each protrusion 37B. It is possible to move.
  • the contact ratio with the cathode catalyst layer 34 per unit area in the gas diffusion part 37 is preferably 40% or more and 85% or less in consideration of ensuring electrical conductivity and maintaining gas diffusibility.
  • a gas diffusion path 37C is formed between the inner cathode catalyst layer 34 surrounded by the cathode seal layer 35 and the recessed portion 37A of the gas diffusion portion 37 .
  • Hydrogen is delivered to the gas diffusion path 37C from a hydrogen flow path (not shown) provided at the other end of the gas diffusion path 37C (the other end remote from the one end of the gas diffusion path 27C provided with the water flow path). be done.
  • Titanium, stainless steel, carbon, or the like can be used as the separator member 36 .
  • the water electrolysis device 10 includes voltage applying means (not shown). A voltage is applied between the separator member 26 and the separator member 36 by the voltage application means. The voltage and current of the separator member 26 and the separator member 36 are measured by a voltmeter and an ammeter (not shown), and are controlled by a controller (not shown) based on the voltage and current values between the separator member 26 and the separator member 36. be done.
  • the oxygen O 2 is diffused by the gas diffusion portion 27 having an uneven pattern, flows toward the other end of the gas diffusion path 27C, and is sent out from the oxygen flow path together with unreacted water (H 2 O).
  • the hydrogen ions H 2 + move to the cathode side through the electrolyte membrane 21, acquire electrons e ⁇ supplied through the external wiring (reaction (2)), become hydrogen H 2 , diffuse in the gas diffusion section 37, and become gaseous. It is delivered from a hydrogen channel provided at the other end of the diffusion channel 37C.
  • the uneven pattern gas diffusion portions 27 and 37 formed integrally with the separator members 26 and 37 can diffuse water, oxygen, and hydrogen in the gas diffusion paths 27C and 37C. Therefore, there is no need to provide a separate member for gas diffusion, and costs such as material costs and processing costs can be reduced. In particular, compared to cells in which the gas diffusion layer and the separator member are separate members, there is no need to plate the separator member, and the manufacturing cost can be reduced. In addition, the interface between the gas diffusion layer and the separator member is eliminated, and deterioration of electrical connection due to oxidation of the interface can be prevented.
  • the depths B1 and B2 of the concave portions 27B and 37B are shallower than the thicknesses T1 and T2 of the separator members 26 and 36, and the average pitches P1 and P2 of the uneven patterns are equal to the thickness T1 , T2, the gas diffusion paths 27C and 37C can maintain the easiness of manufacturing the gas diffusion portions 27 and 37 while ensuring the gas diffusibility.
  • main flow portion 29 may also be formed in the separator member 36 on the cathode side.
  • FIGS. 5A, 5B, 6A and 6B A second embodiment of the present invention will now be described with reference to FIGS. 5A, 5B, 6A and 6B.
  • the same reference numerals are given to the same parts as in the first embodiment, and detailed description thereof will be omitted.
  • the water electrolysis device 10 of the present embodiment uses separator members 26-2 and 36-2 instead of the separator members 26 and 36. Configurations other than the separator members 26 and 36 are the same as in the first embodiment.
  • a separator member 26 - 2 is laminated on the anode seal layer 25 .
  • the separator member 26-2 has a rectangular plate shape, and a gas diffusion section 27-2 is integrally formed on the surface on the anode catalyst layer 24 side.
  • the gas diffusion part 27-2 is formed at a position corresponding to the anode catalyst layer 24 in plan view, and has the same shape as the anode catalyst layer 24 in plan view.
  • the gas diffusion portion 27-2 includes a groove recess 27B-2 formed by a plurality of grooves extending from one end side to the other end side in a plan view, and a gap between the groove recess 27B-2.
  • a convex portion 27A-2 is formed on the .
  • the recessed groove 27B-2 is recessed from the surface of the separator member 26-2.
  • a long protrusion 27A-2 sandwiched between the adjacent groove recesses 27B-2 is formed in a portion where the groove recesses 27B-2 are not formed.
  • the gas diffusion part 27-2 is thus integrally formed with an uneven pattern on its surface.
  • the groove recess 27B-2 is formed apart from the adjacent groove recess 27B-2, and the top 27AP-2 of the projection 27A-2 is flat. By flattening the top portion 27AP-2 in this manner, the contact area with the anode catalyst layer 24 can be increased.
  • An average interval D5 between adjacent convex portions 27A-2 is set to 10 ⁇ m or more and 250 ⁇ m or less.
  • the average opening width D6 (same as D5 in this embodiment) in plan view is set to 10 ⁇ m or more and 250 ⁇ m or less.
  • the average pitch P3 of the concave/convex pattern formed by the convex portions 27A-2 and the groove concave portions 27B-2 is set to 20 ⁇ m or more and 500 ⁇ m or less.
  • the average opening width D6 is less than 10 ⁇ m, and the average pitch P3 is less than 20 ⁇ m, manufacturing becomes difficult. If the average interval D5, the average aperture width D6 exceeds 250 ⁇ m, and the average pitch P3 exceeds 500 ⁇ m, the diffusion of gas becomes insufficient and the performance deteriorates.
  • the depth B1 of the groove recess 27B-2 is set to be shallower than the thickness T1 of the separator member 26-2, and the average pitch P3 of the uneven pattern is set to be smaller than the thickness T1.
  • the contact ratio with the anode catalyst layer 24 per unit area in the gas diffusion part 27-2 is preferably 40% or more and 85% or less in consideration of ensuring electrical conductivity and maintaining gas diffusion.
  • the average interval D5, the average opening width D6, the average pitch P3 of the concave-convex pattern, and the depth B1 can be measured using a scanning electron microscope, an optical microscope, images obtained through these, and the like.
  • a gas diffusion path 27C is formed between the inner anode catalyst layer 24 surrounded by the anode seal layer 25 and the groove recess 27B-2 of the gas diffusion section 27-2.
  • separator member 26-2 a member similar to the separator member 26 can be used.As a method of forming the concave-convex pattern on the surface of the separator member 26-2, pressing, embossing, dressing, cutting, etc. can be used. can be used.
  • a separator member 36 - 2 is laminated on the cathode seal layer 35 .
  • the separator member 36-2 has a rectangular plate shape, and a gas diffusion section 37-2 is integrally formed on the surface on the cathode catalyst layer 34 side.
  • the gas diffusion part 37-2 is formed at a position corresponding to the cathode catalyst layer 34 in plan view, and has the same shape as the cathode catalyst layer 34 in plan view.
  • the gas diffusion portion 37-2 includes groove recesses 37B-2 formed of a plurality of grooves extending from one end side to the other end side in a plan view, and a groove between the groove recesses 37B-2.
  • a convex portion 37A-2 is formed on the .
  • the groove recess 37B-2 is recessed from the surface of the separator member 36-2. In the portion where the recessed groove 37B-2 is not formed, an elongated projection 37A-2 is formed between the adjacent recessed grooves 37B-2.
  • the gas diffusion portion 37-2 is thus integrally formed with an uneven pattern on its surface.
  • the groove recess 37B-2 is formed apart from the adjacent groove recess 37B-2, and the top 37AP-2 of the projection 37A-2 is flat. By flattening the top portion 37AP-2 in this manner, the contact area with the cathode catalyst layer 34 can be increased.
  • An average interval D7 between adjacent convex portions 37A-2 is set to 10 ⁇ m or more and 250 ⁇ m or less.
  • the average opening width D8 (same as D7 in this embodiment) in plan view is set to 10 ⁇ m or more and 250 ⁇ m or less.
  • the average pitch P4 of the concave/convex pattern formed by the convex portions 37A-2 and the groove concave portions 37B-2 is set to 20 ⁇ m or more and 500 ⁇ m or less.
  • the average aperture width D8 is less than 10 ⁇ m, and the average pitch P4 is less than 20 ⁇ m, manufacturing becomes difficult. If the average interval D7, the average opening width D8 exceeds 250 ⁇ m, and the average pitch P4 exceeds 500 ⁇ m, the diffusion of gas becomes insufficient and the performance deteriorates.
  • the average interval D7 and the average opening width D8 are preferably 10 ⁇ m or more and 150 ⁇ m or less.
  • the depth B1 of the groove recess 37B-2 is set to be shallower than the thickness T1 of the separator member 36-2, and the average pitch P4 of the uneven pattern is set to be smaller than the thickness T1.
  • the convex portion 37A-2 is arranged in contact with the cathode catalyst layer 34 of the electrolyte membrane 21 .
  • the projections 37A-2 maintain contact with the cathode catalyst layer 34 to ensure conductivity, but have gaps that allow fluid movement between the grooves and recesses 37B-2. ing.
  • the contact ratio with the cathode catalyst layer 34 per unit area in the gas diffusion part 37-2 is preferably 40% or more and 85% or less in consideration of ensuring electrical conductivity and maintaining gas diffusion.
  • the average interval D7, the average opening width D8, the average pitch P4 of the concave-convex pattern, and the depth B1 can be measured using a scanning electron microscope, an optical microscope, images obtained through these, and the like.
  • a gas diffusion path 37C is formed between the inner cathode catalyst layer 34 surrounded by the cathode seal layer 35 and the groove recess 37B-2 of the gas diffusion section 37-2.
  • separator member 36-2 a member similar to the separator member 36 can be used.As a method for forming the concave-convex pattern on the surface of the separator member 36-2, pressing, embossing, dressing, cutting, etc. can be used. can be used.
  • the protrusions may be randomly arranged without aligning them. Furthermore, the size and shape of the protrusions do not need to be the same, and may be random shapes.
  • a plurality of elongated straight grooves in a plan view has been described as an example.
  • grooves of other shapes are also possible.
  • a concavo-convex pattern may be employed in which a plurality of wavy grooves 41 are used as concave portions and convex portions 42 are formed between adjacent grooves.
  • the elongated linear groove 43 arranged obliquely in a plan view may be used as the concave portion, and the portion surrounded by the groove 43 may be used as the convex portion 44 .
  • the gas diffusion portions 27, 37 are formed on one side of the separator members 26, 36, but as shown in FIG. 8, they can be formed on both sides to form a cell stack.
  • one side of the one separator member 26 arranged in the middle of the stack serves as the gas diffusion section 27 facing the anode catalyst layer 24, and the other side serves as the gas diffusion section 37 facing the cathode catalyst layer 34.
  • solid polymer electrolyte membrane (PEM) water electrolysis device 10 was described as an example, but the present invention can also be used for an anion exchange membrane (AEM) water electrolysis device. .
  • AEM anion exchange membrane

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Inorganic Chemistry (AREA)
  • Fuel Cell (AREA)
  • Electrolytic Production Of Non-Metals, Compounds, Apparatuses Therefor (AREA)

Abstract

Un dispositif (10) d'électrolyse de l'eau comprend : une membrane d'électrolyte (21) obtenue par stratification d'une couche (24) de catalyseur d'anode sur une surface d'une couche (22) d'électrolyte, et par stratification d'une couche (34) de catalyseur de cathode sur l'autre surface ; et un élément séparateur électroconducteur (26) obtenu par formation en une seule pièce, sur la surface, d'un motif en saillies/évidements dans lequel des évidements présentant une largeur d'ouverture moyenne comprise entre 10 et 250 µm, ou des saillies présentant un intervalle moyen entre sommets compris entre 10 et 250 µm, sont agencés à un pas moyen compris entre 20 et 500 µm, par disposition des saillies du motif d'évidements/saillies en contact avec la couche (24) de catalyseur d'anode, et par formation d'un circuit de diffusion de gaz (27C) entre la couche (24) de catalyseur d'anode et l'élément séparateur (26).
PCT/JP2022/037689 2021-12-07 2022-10-07 Dispositif d'électrolyse de l'eau WO2023105909A1 (fr)

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JP2021-198440 2021-12-07
JP2021198440A JP7102599B1 (ja) 2021-12-07 2021-12-07 水電解デバイス

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN117468024A (zh) * 2023-10-31 2024-01-30 温州高企氢能科技有限公司 一种用于碱性电解水制氢的阵列式流场结构及电解槽

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2006135108A1 (fr) * 2005-06-17 2006-12-21 University Of Yamanashi Séparateur métallique destiné à une pile à combustible et son procédé de fabrication
JP2020132965A (ja) * 2019-02-21 2020-08-31 株式会社東芝 二酸化炭素電解セル用電極触媒層、ならびにそれを具備する、電解セルおよび二酸化炭素電解用電解装置

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2006135108A1 (fr) * 2005-06-17 2006-12-21 University Of Yamanashi Séparateur métallique destiné à une pile à combustible et son procédé de fabrication
JP2020132965A (ja) * 2019-02-21 2020-08-31 株式会社東芝 二酸化炭素電解セル用電極触媒層、ならびにそれを具備する、電解セルおよび二酸化炭素電解用電解装置

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN117468024A (zh) * 2023-10-31 2024-01-30 温州高企氢能科技有限公司 一种用于碱性电解水制氢的阵列式流场结构及电解槽

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