# US 2014/0154608 A1 · Cathode catalyst layer, membrane electrode assembly and polymer electrolyte fuel cell and manufacturing method thereof

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- Number: US 2014/0154608 A1
- Document ID: US20140154608A1
- Status: Published application
- Kind: A1
- Application number: 13/995,635
- Filed: 2011-12-20
- Published: 2014-06-05
- Earliest claimed: 2010-12-20
- Assignees: E. I. Du Pont de Nemours and Company; Toyota Jidosha Kabushiki Kaisha
- Inventors: Nobuaki Nonoyama; Masanori Aimu; Randal Lewis Perry; Mark Gerrit Roelofs; Robert Clayton Wheland; Ralph Munson Aten
- Web page: https://patentgrep.com/patent/US20140154608A1

## CPC

- H01M 4/8657: {layered}
- H01M 4/8652: {as mixture}
- H01M 4/8663: {Selection of inactive substances as ingredients for catalytic active masses, e.g. binders, fillers}
- H01M 4/8668: {Binders}
- H01M 8/1004: characterised by membrane-electrode assemblies [MEA] (H01M8/12 takes precedence)
- H01M 4/886: {Powder spraying, e.g. wet or dry powder spraying, plasma spraying}
- H01M 2008/1095: {Fuel cells with polymeric electrolytes}
- 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 cathode catalyst layer used for a polymer electrolyte fuel cell that includes an electrolyte membrane is provided. The cathode catalyst layer comprises a catalyst having weight of not greater than 0.3 mg/cm2 of a reaction surface of the cathode catalyst layer that is adjoining the electrolyte membrane; and an electrolyte resin having oxygen permeability of not less than 2.2*10−14 mol/m/s/Pa in an environment of temperature of 80 degrees Celsius and relative humidity of 50%.

## Claims

### Claim 1

A cathode catalyst layer used for a polymer electrolyte fuel cell that includes an electrolyte membrane, comprising:
a catalyst having weight of not greater than 0.3 mg/cm2 of a reaction surface of the cathode catalyst layer that is adjoining the electrolyte membrane; and
an electrolyte resin having oxygen permeability of not less than 2.2*10-14 mol/m/s/Pa in an environment of temperature of 80 degrees Celsius and relative humidity of 50%.

### Claim 2 (depends on 1)

The cathode catalyst layer according to claim 1, wherein
the catalyst has weight of not greater than 0.1 mg/cm2 of the reaction surface.

### Claim 3 (depends on 1)

The cathode catalyst layer according to claim 1, wherein
the catalyst has surface area of not greater than 200 cm2/cm2 of the reaction surface.

### Claim 4 (depends on 1)

The cathode catalyst layer according to claim 1, wherein
the catalyst is platinum.

### Claim 5 (depends on 1)

The cathode catalyst layer according to claim 1, wherein the electrolyte resin is a copolymer comprising:
(a) polymerized units of one or more fluoromonomer (A-1) or (A-2),
and
(b) polymerized units of one or more fluoromonomer (B), where the fluoromonomer (B) is selected from perfluorosulfonic acid monomer and derivatives and salts thereof and perfluorosulfonate monomer and derivatives and salts thereof.

### Claim 6 (depends on 5)

The cathode catalyst layer according to claim 5, wherein
the fluoromonomer (B) is CF2=CF—O—[CF2]n-SO2X,
n=2, 3, 4 or 5,
X=F, CI, OH or OM, and
M is a monovalent cation.

### Claim 7 (depends on 1)

A membrane electrode assembly, comprising the cathode catalyst layer according to claim 1.

### Claim 8 (depends on 1)

A polymer electrolyte fuel cell, comprising the cathode catalyst layer according to claim 1.

### Claim 9

A manufacturing method of a polymer electrolyte fuel cell, comprising:
forming a cathode catalyst layer on either an electrolyte membrane or a gas diffusion layer, wherein
the cathode catalyst layer includes: an electrolyte resin having oxygen permeability of not less than 2.2*10-14 mol/m/s/Pa in an environment of temperature of 80 degrees Celsius and relative humidity of 50%; and
a catalyst for oxygen reduction reaction having weight of not greater than 0.3 mg/cm2 of a reaction surface of the cathode catalyst layer.