# US 2019/0173097 A1 · Mixed metal oxide compounds and electrocatalytic compositions, devices and processes using the same

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- Number: US 2019/0173097 A1
- Document ID: US20190173097A1
- Status: Published application
- Kind: A1
- Application number: 16/303,010
- Filed: 2017-06-07
- Published: 2019-06-06
- Earliest claimed: 2016-06-07
- Assignees: Cornell University
- Applicants: Cornell University
- Inventors: Marc MURPHY; Ryo H. WAKABAYASHI; R. Bruce VAN DOVER; Héctor D. ABRUÑA; Francis J. DISALVO
- Web page: https://patentgrep.com/patent/US20190173097A1

## CPC

- H01M 4/9016: {Oxides, hydroxides or oxygenated metallic salts}
- H01M 8/083: Alkaline fuel cells
- H01M 8/1004: characterised by membrane-electrode assemblies [MEA] (H01M8/12 takes precedence)
- H01M 12/08: composed of a half-cell of a fuel-cell type and a half-cell of the secondary-cell type
- Y02E 60/10: Energy storage using batteries
- 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 metal oxide compound of formula (I): MnxMyRu1-(x+y)O2 (I) is a single phase rutile-type structure, where M is Co, Ni, or Fe, or a combination thereof, x>0, y≥0, and 0.02≤(x+y)≤0.30. Related electro-catalysts, devices, and processes are also provided.

## Claims

### Claim 1

A metal oxide compound of formula (I′):
MnxMyRu1-(x+y)O2 (I′)
wherein the compound is a single phase rutile-type structure, and wherein
M is selected from the group consisting of Co, Ni, and Fe, and combinations thereof;
x>0;
y>0; and
0.02≤(x+y)≤0.30.

### Claim 2 (depends on 1)

The metal oxide compound according to claim 1, wherein 0.02<x<0.28 and 0<y<0.20.

### Claim 3 (depends on 1)

The metal oxide compound according to claim 1, wherein said compound is a quaternary compound and M is selected from Co, Ni, and Fe.

### Claim 4 (depends on 3)

The metal oxide compound according to claim 3, wherein M is Co.

### Claim 5 (depends on 3)

The metal oxide compound according to claim 3, wherein M is Ni.

### Claim 6 (depends on 3)

The metal oxide compound according to claim 3, wherein M is Fe.

### Claim 7 (depends on 1)

The metal oxide compound according to claim 1, wherein 0.10≤x≤0.20.

### Claim 8 (depends on 1)

The metal oxide compound according to claim 1, wherein 0<y<0.15

### Claim 9 (depends on 1)

The metal oxide compound according to claim 1, wherein all Mn atoms present in the compound are atomically incorporated into the rutile-type structure.

### Claim 10 (depends on 1)

The metal oxide compound according to claim 1, wherein the source of the Mn present in the compound is Mn2O3 or beta “β” phase MnO2.

### Claim 11

An electro-catalyst for use under alkaline conditions comprising a metal oxide compound according to formula (I):
MnxMyRu1-(x+y)O2 (I)
wherein the compound is a single phase rutile-type structure, and wherein
M is selected from the group consisting of Co, Ni, and Fe, and combinations thereof;
x>0;
y≥0; and
0.02≤(x+y)≤0.30.

### Claim 12 (depends on 11)

The electro-catalyst according to claim 11, wherein Mn atoms are incorporated into the structure of RuO2, and said electro-catalyst does not comprise MnO2 by itself.

### Claim 13 (depends on 11)

The electro-catalyst according to claim 11, wherein said electro-catalyst does not comprise a rare earth metal.

### Claim 14 (depends on 11)

A film comprising the metal oxide compound of formula (I) according to claim 11.

### Claim 15 (depends on 14)

The film according to claim 14, having a thickness of 150 to 400 nm.

### Claim 16 (depends on 11)

A solid particle comprising the metal oxide compound according to claim 11.

### Claim 17 (depends on 11)

A membrane electrode assembly (MEA) comprising the metal oxide compound of formula (I) according to claim 11.

### Claim 18

(canceled)

### Claim 19 (depends on 11)

An alkaline fuel cell catalyst comprising the electro-catalyst according to claim 11.

### Claim 20 (depends on 11)

An electro-catalytic process performed at a pH>7, wherein said process comprises using the electro-catalyst according to claim 11.

### Claim 21

(canceled)

### Claim 22

(canceled)

### Claim 23

(canceled)

### Claim 24 (depends on 11)

A cathode or an air battery comprising the metal oxide compound of formula (I) according to claim 11.

### Claim 25

(canceled)