# US 12,763,337 B2 · Gas diffusion electrode base material product and polymer electrolyte fuel cell

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- Number: US 12,763,337 B2
- Document ID: US12763337B2
- Status: Granted
- Kind: B2
- Application number: 18/037,616
- Filed: 2021-11-25
- Published: 2024-01-25
- Granted: 2026-10-13
- Earliest claimed: 2020-11-26
- Assignees: Toray Industries, Inc.
- Applicants: Toray Industries, Inc.
- Inventors: Hiroaki Otake; Masamichi Utsunomiya; Fumitaka Watanabe
- Web page: https://patentgrep.com/patent/US12763337B2

## CPC

- H01M 4/8807: {Gas diffusion layers}
- H01M 4/8605: {Porous electrodes}
- H01M 4/8673: {Electrically conductive fillers}
- H01M 4/96: Carbon-based electrodes
- H01M 8/1004: characterised by membrane-electrode assemblies [MEA] (H01M8/12 takes precedence)
- H01M 8/1018: Polymeric electrolyte materials
- H01M 2008/1095: {Fuel cells with polymeric electrolytes}
- H01M: PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY

## Abstract

An object of the present invention is to shorten the aging time for a fuel cell. To achieve the object, a gas diffusion electrode medium product according to the present invention includes sulfuric acid in an amount of 1.1 μg/cm2 or less. In addition, a polymer electrolyte fuel cell according to the present invention has the gas diffusion electrode medium product according to the present invention incorporated therein.

## Claims

### Claim 1

A gas diffusion electrode medium product comprising sulfuric acid in an amount of from 0.01 to 1.1 μg/cm2.

### Claim 2 (depends on 1)

The gas diffusion electrode medium product according to claim 1, comprising sulfuric acid in an amount of from 0.01 to 0.5 μg/cm2.

### Claim 3 (depends on 2)

The gas diffusion electrode medium product according to claim 2, comprising sulfuric acid in an amount of from 0.01 to 0.2 μg/cm2.

### Claim 4 (depends on 1)

The gas diffusion electrode medium product according to claim 1, comprising an electroconductive porous material composed of a carbon fiber, wherein a fluoropolymer containing sulfur in an amount of 50 ppm or less is attached to said carbon fiber.

### Claim 5 (depends on 1)

The gas diffusion electrode medium product according to claim 1, comprising: an electroconductive porous material composed of a carbon fiber; and a microporous layer containing carbon powder and provided on at least one face of said electroconductive porous material.

### Claim 6 (depends on 5)

The gas diffusion electrode medium product according to claim 5, wherein said carbon powder comprises sulfur in an amount of 3000 ppm or less.

### Claim 7 (depends on 5)

The gas diffusion electrode medium product according to claim 5, wherein said microporous layer comprises a fluoropolymer containing sulfur in an amount of 50 ppm or less.

### Claim 8 (depends on 5)

The gas diffusion electrode medium product according to claim 5, comprising carbon black heat-treated at 2000° C. or more under an inert atmosphere for 10 minutes or more.

### Claim 9 (depends on 1)

A polymer electrolyte fuel cell, comprising said gas diffusion electrode medium product according to claim 1 incorporated therein.