# US 2010/0167162 A1 · Membrane-electrode assembly, method for producing the same and solid polymer fuel cell

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- Number: US 2010/0167162 A1
- Document ID: US20100167162A1
- Status: Published application
- Kind: A1
- Application number: 12/664,514
- Filed: 2008-06-13
- Published: 2010-07-01
- Earliest claimed: 2007-06-15
- Assignees: Sumitomo Chemical Company, Limited
- Inventors: Hiroshi Shinoda; Hiroyuki Kurita; Shin Saito; Ryuma Kuroda
- Web page: https://patentgrep.com/patent/US20100167162A1

## CPC

- H01M 8/1004: characterised by membrane-electrode assemblies [MEA] (H01M8/12 takes precedence)
- H01M 4/881: {Electrolytic membranes}
- H01M 4/886: {Powder spraying, e.g. wet or dry powder spraying, plasma spraying}
- H01M 4/921: {Alloys or mixtures with metallic elements}
- H01M 4/926: {on carbon or graphite}
- H01M 8/1027: having carbon, oxygen and other atoms, e.g. sulfonated polyethersulfones [S-PES]
- H01M 8/1032: having sulfur, e.g. sulfonated-polyethersulfones [S-PES]
- H01M 8/1046: Mixtures of at least one polymer and at least one additive
- H01M 8/1081: starting from solutions, dispersions or slurries exclusively of polymers
- Y02E 60/50: Fuel cells
- Y02P 70/50: Manufacturing or production processes characterised by the final manufactured product
- H01M: PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02P: CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS

## Abstract

A membrane-electrode assembly comprising an anode catalyst layer and cathode catalyst layer placed each other, and a polymer electrolyte membrane formed between the anode catalyst layer and cathode catalyst layer. The polymer electrolyte membrane comprises: a hydrocarbon-based polymer electrolyte, and the anode catalyst layer and cathode catalyst layer both comprise a catalyst-supported material, having at least one catalyst substance selected from among platinum and platinum-containing alloys and a support on which the catalyst substance is supported; and a polymer electrolyte. Either or both the anode catalyst layer and cathode catalyst layer have a catalyst-supporting ratio of 60 wt % or greater in the catalyst-supported material.

## Claims

### Claim 1

A membrane-electrode assembly comprising an anode catalyst layer and cathode catalyst layer placed opposite each other, and a polymer electrolyte membrane formed between the anode catalyst layer and cathode catalyst layer,
wherein the polymer electrolyte membrane comprises a hydrocarbon-based polymer electrolyte,
the anode catalyst layer and cathode catalyst layer comprise: a catalyst-supported material, having at least one catalyst substance selected from among platinum and platinum-containing alloys and a support on which the catalyst substance is supported; and a polymer electrolyte, and
the catalyst-supporting ratio of the catalyst-supported material in either or both the anode catalyst layer and cathode catalyst layer is 60 wt % or greater.

### Claim 2 (depends on 1)

A membrane-electrode assembly according to claim 1, wherein the hydrocarbon-based polymer electrolyte in the polymer electrolyte membrane is a block copolymer comprising a first block composed of a repeating unit with an ion-exchange group, and a second block composed essentially of a repeating unit with no ion-exchange group.

### Claim 3 (depends on 1)

A membrane-electrode assembly according to claim 1, wherein the polymer electrolytes in the anode catalyst layer and cathode catalyst layer are hydrocarbon-based polymer electrolytes.

### Claim 4 (depends on 1)

A method for producing a membrane-electrode assembly according to claim 1,
the method comprising a step of forming an anode catalyst layer and/or cathode catalyst layer using catalyst ink containing a solvent selected from among water and hydrophilic solvents, a catalyst substance and a hydrocarbon-based polymer electrolyte, wherein at least a portion of the hydrocarbon-based polymer electrolyte is dispersed in the solvent.

### Claim 5 (depends on 4)

The method according to claim 4, wherein in the step of forming the anode catalyst layer and/or cathode catalyst layer, the anode catalyst layer and/or cathode catalyst layer is formed by a method of directly coating the catalyst ink onto the polymer electrolyte membrane by spraying and removing the solvent from the coated catalyst ink.

### Claim 6 (depends on 1)

A solid polymer fuel cell comprising a membrane-electrode assembly according to claim 1.