Gas diffusion electrode

Patent metadata

Field	Value
Publication number	US-2018219228-A1
Application number	US-201615747284-A
Country	US
Kind code	A1
Filing date	Jun 14, 2016
Priority date	Aug 27, 2015
Publication date	Aug 2, 2018
Grant date	—

Abstract

The present invention provides a fuel cell gas diffusion layer that satisfies both performances and durability. The present invention is a gas diffusion electrode having microporous layers on at least one side of an electrically conductive porous substrate, wherein the microporous layer has at least a first microporous layer in contact with the electrically conductive porous substrate, and a second microporous layer, wherein the second microporous layer is positioned as the outermost layer of the microporous layer, which second microporous layer contains an electrically conductive material having a linear portion.

First claim

1 . A gas diffusion electrode comprising microporous layers on at least one side of an electrically conductive porous substrate,
said microporous layers having at least a first microporous layer in contact with said electrically conductive porous substrate, and a second microporous layer, said second microporous layer containing an electrically conductive material having a linear portion.

2 . The gas diffusion electrode according to claim 1 , wherein said electrically conductive material having a linear portion has a linear portion with an aspect ratio of 30 or more and 5000 or less.

3 . The gas diffusion electrode according to claim 1 , wherein said electrically conductive material having a linear portion is a linear carbon.

4 . The gas diffusion electrode according to claim 1 , wherein said first microporous layer contains an electrically conductive microparticle.

5 . The gas diffusion electrode according to claim 4 , wherein said electrically conductive microparticle has a particle size of 3 nm or more and 500 nm or less.

6 . The gas diffusion electrode according to claim 1 , wherein said second microporous layer is positioned as the outermost layer of said microporous layers.

7 . The gas diffusion electrode according to claim 1 , wherein said microporous layers have a surface roughness of 0.1 μm or more and 4 μm or less.

8 . The gas diffusion electrode according to claim 1 , wherein the number of cracks with a length of not less than 100 μm and a width of not less than 10 μm in said second microporous layer is not more than 10 per 1-cm 2 surface of the second microporous layer.

9 . The gas diffusion electrode according to claim 1 , wherein the through-plane direction gas diffusivity is not less than 30%.

10 . The gas diffusion electrode according to claim 1 , wherein the through-plane direction electrical resistance is not more than 4.0 mΩ cm 2 upon pressing at 2.4 MPa.

11 . A fuel cell comprising the gas diffusion electrode according to claim 1 .

Assignees

• Toray Industries

Inventors

• Hashimoto Masaru
• Wakatabe Michio
• Tanimura Yasuaki

Classifications

• H01M4/8807

  Gas diffusion layers · CPC title

• H01M8/0243

  in the form of mixtures · CPC title

• H01M2008/1095

  Fuel cells with polymeric electrolytes · CPC title

• H01M8/0234

  Carbonaceous material · CPC title

• H01M4/8673

  Electrically conductive fillers · CPC title