# US 2022/0285697 A1 · Electrocatalyst

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- Number: US 2022/0285697 A1
- Document ID: US20220285697A1
- Status: Published application
- Kind: A1
- Application number: 17/653,400
- Filed: 2022-03-03
- Published: 2022-09-08
- Earliest claimed: 2021-03-04
- Assignees: Toyota Jidosha Kabushiki Kaisha; Cataler Corporation
- Inventors: Ryo SHIMIZU; Kumiko NOMURA; Tomohiro TAKESHITA; Shu MIYASAKA; Kenji YAMAMOTO
- Web page: https://patentgrep.com/patent/US20220285697A1

## CPC

- H01M 4/926: {on carbon or graphite}
- H01M 4/8842: {Coating using a catalyst salt precursor in solution followed by evaporation and reduction of the precursor}
- H01M 4/921: {Alloys or mixtures with metallic elements}
- C22C 5/04: Alloys based on a platinum group metal
- H01M 2008/1095: {Fuel cells with polymeric electrolytes}
- Y02E 60/50: Fuel cells
- H01M: PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- C22C: ALLOYS (treatment of alloys C21D, C22F)
- Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION

## Abstract

To provide an electrocatalyst for fuel cells, which is configured to ensure both the initial performance and durability of fuel cells. An electrocatalyst for fuel cells, wherein the electrocatalyst comprises a carbon support including a mesopore and a catalyst alloy supported on the carbon support, and the catalyst alloy is a catalyst alloy of platinum and a transition metal; wherein the mesopore includes at least one throat; wherein an average effective diameter of the at least one throat is 1.8 nm or more and less than 3.2 nm; and wherein a transition metal ratio of the catalyst alloy supported on a deeper-side region than the at least one throat, is lower than the transition metal ratio of the catalyst alloy supported on a nearer-side region than the at least one throat.

## Claims

### Claim 1

An electrocatalyst for fuel cells,
wherein the electrocatalyst comprises a carbon support including a mesopore and a catalyst alloy supported on the carbon support, and the catalyst alloy is a catalyst alloy of platinum and a transition metal;
wherein the mesopore includes at least one throat;
wherein an average effective diameter of the at least one throat is 1.8 nm or more and less than 3.2 nm; and
wherein a transition metal ratio of the catalyst alloy supported on a deeper-side region than the at least one throat, is lower than the transition metal ratio of the catalyst alloy supported on a nearer-side region than the at least one throat.

### Claim 2 (depends on 1)

The electrocatalyst according to claim 1, wherein an average effective diameter of the mesopore is 3.2 nm or more and 3.8 nm or less.

### Claim 3 (depends on 1)

The electrocatalyst according to claim 1, wherein the average effective diameter of the at least one throat is 1.8 nm or more and 2.1 nm or less.

### Claim 4 (depends on 1)

The electrocatalyst according to claim 1, wherein the transition metal is at least one selected from the group consisting of cobalt and nickel.

### Claim 5 (depends on 1)

A fuel cell comprising a catalyst layer comprising the electrocatalyst defined by claim 1.