Catalyst layer

Patent metadata

Field	Value
Publication number	US-11888165-B2
Application number	US-202117543843-A
Country	US
Kind code	B2
Filing date	Dec 7, 2021
Priority date	Dec 10, 2020
Publication date	Jan 30, 2024
Grant date	Jan 30, 2024

Abstract

To provide a catalyst layer that is low in gas diffusion resistance and proton resistance even when a support having a small specific surface area is used. The catalyst layer is a catalyst layer for fuel cells, wherein the catalyst layer comprises a catalyst metal, a support and a conductive additive; wherein the support supports the catalyst metal; wherein a specific surface area of the support is 600 m 2 /g-C or less; wherein the conductive additive does not support the catalyst metal and has a larger aspect ratio than the support; wherein the aspect ratio of the conductive additive is more than 10; wherein, when a total mass of the catalyst layer is 100 mass %, a percent of the conductive additive contained in the catalyst layer is more than 2 mass % and less than 20 mass %; and wherein the conductive additive is a non-hydrophilized conductive additive.

First claim

The invention claimed is:

1. A catalyst layer for fuel cells,
wherein the catalyst layer comprises a catalyst metal, a support and a conductive additive;
wherein the support supports the catalyst metal;
wherein a specific surface area of the support is 580 m 2 /g-C;
wherein the conductive additive does not support the catalyst metal and has a larger aspect ratio than the support;
wherein the aspect ratio of the conductive additive is 40;
wherein, when a total mass of the catalyst layer is 100 mass %, a percent of the conductive additive contained in the catalyst layer is 10 mass %; and
wherein the conductive additive is a non-hydrophilized conductive additive.

2. The catalyst layer according to claim 1 , wherein the support and the conductive additive are carbonaceous materials.

Assignees

• Toyota Motor Co Ltd

Inventors

• Kitao Noriyuki

Classifications

• H01M4/8673 Primary

  Electrically conductive fillers · CPC title

• H01M4/8807

  Gas diffusion layers · CPC title

• H01M4/9041 Primary

  Metals or alloys (H01M4/92 takes precedence) · CPC title

• H01M4/90 Primary

  Selection of catalytic material · CPC title

• H01M4/9083

  on carbon or graphite · CPC title