# US 2019/0245213 A1 · Redox reaction electrode and fuel battery

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- Number: US 2019/0245213 A1
- Document ID: US20190245213A1
- Status: Published application
- Kind: A1
- Application number: 16/256,000
- Filed: 2019-01-24
- Published: 2019-08-08
- Earliest claimed: 2018-02-05
- Assignees: Denso Corporation
- Applicants: Denso Corporation
- Inventors: Keisuke FUGANE; Tomoya ITAKURA; Takashi SATO
- Web page: https://patentgrep.com/patent/US20190245213A1

## CPC

- H01M 4/8663: {Selection of inactive substances as ingredients for catalytic active masses, e.g. binders, fillers}
- H01M 4/8668: {Binders}
- H01M 4/926: {on carbon or graphite}
- H01M 2008/1095: {Fuel cells with polymeric electrolytes}
- H01M 2300/0008: Phosphoric acid-based
- H01M 2300/0085: Immobilising or gelification of electrolyte
- Y02E 60/50: Fuel cells
- 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

## Abstract

A redox reaction electrode includes a catalyst carrier, a Pt catalyst supported on the catalyst carrier, and an ionomer having proton conductivity. The ionomer contains H4PO4+. As a result, the redox reaction electrode has improved redox performance. A fuel battery includes the redox reaction electrode and an electrolyte disposed to be in contact with the redox reaction electrode.

## Claims

### Claim 1

A redox reaction electrode comprising:
a catalyst carrier;
a Pt catalyst supported on the catalyst carrier; and
an ionomer having proton conductivity, wherein
the ionomer contains H4PO4+.

### Claim 2 (depends on 1)

The redox reaction electrode according to claim 1, wherein
peak shift δ of 31P-NMR is 0.5 ppm or more.

### Claim 3 (depends on 1)

The redox reaction electrode according to claim 1, wherein
the ionomer further contains a strong add having acidity higher than H3PO4.

### Claim 4 (depends on 3)

The redox reaction electrode according to claim 3, wherein
molar ratio of phosphoric add to the strong add in the ionomer is 1 or less.

### Claim 5 (depends on 3)

The redox reaction electrode according to claim 3, wherein
the strong acid includes a strong acid polymer having a sulfone group.

### Claim 6 (depends on 3)

The redox reaction electrode according to claim 3, wherein
the strong add includes at least one add selected from the group consisting of sulfuric acid, hydrochloric add, nitric acid, perchloric acid, trifluoromethanesulfonic add, and 1,1,1-trifluoro-N-[(trifluoromethyl)sulfonyl]methanesulfonamide.

### Claim 7 (depends on 1)

The redox reaction electrode according to claim 1, wherein
the redox reaction electrode is used in a fuel battery for generating electric energy by causing a fuel gas and an oxidant gas to undergo electrochemical reaction.

### Claim 8 (depends on 7)

The redox reaction electrode according to claim 7, wherein
the redox reaction electrode is supplied with the oxidant gas.

### Claim 9 (depends on 1)

A fuel battery comprising:
the redox reaction electrode according to claim 1; and
an electrolyte disposed to be in contact with the redox reaction electrode.