# US 2014/0154613 A1 · Air electrode catalyst material, solid oxide fuel cell system, and method of manufacturing the air electrode catalyst material

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- Number: US 2014/0154613 A1
- Document ID: US20140154613A1
- Status: Published application
- Kind: A1
- Application number: 13/906,379
- Filed: 2013-05-31
- Published: 2014-06-05
- Earliest claimed: 2012-12-03
- Assignees: The University of Tokyo; Jx Nippon Oil & Energy Corporation
- Applicants: The University of Tokyo; Jx Nippon Oil & Energy Corporation
- Inventors: YASUSHI SATO; TAKAO KUDO; KOICHI YAMAMURO; SHU YAMAGUCHI; SHOGO MIYOSHI; AYANO TAKESHITA
- Web page: https://patentgrep.com/patent/US20140154613A1

## CPC

- H01M 4/9033: {Complex oxides, optionally doped, of the type M1MeO3, M1 being an alkaline earth metal or a rare earth, Me being a metal, e.g. perovskites}
- H01M 4/8657: {layered}
- H01M 4/8867: {Vapour deposition}
- H01M 4/8885: {Sintering or firing}
- H01M 4/8871: {Sputtering}
- H01M 2004/8689: {Positive electrodes}
- H01M 2008/1293: {Fuel cells with solid oxide electrolytes}
- 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

An air electrode catalyst material according to an embodiment of the present invention is used in solid oxide fuel cells and includes a perovskite oxide represented by a general formula (1): AxByO3-6. A ratio x/y of the A to the B is 1.05≦x/y≦1.5, and a peak derived from a perovskite structure A1B1O3-δ is shown in a chart obtained by an X-ray diffraction measurement, and in Raman spectra, an area of absorption peak existing between 560 cm−1 and 620 cm−1 (inclusive) is larger than that between 380 cm−1 and 440 cm−1 (inclusive).

## Claims

### Claim 1

An air electrode catalyst material to be used in solid oxide fuel cells, comprising:
a perovskite oxide represented by a general formula (1): AxByO3-δ (wherein, A contains at least one element selected from the group consisting of Mg, Ca, Sr, Ba, Sc, Y, and lanthanoid element; B contains at least one element selected from the group consisting of Mn, Fe, Co, and Ni; and δ indicates an amount of oxygen deficiency or oxygen excess for matching the valence number of the perovskite oxide), wherein
a ratio x/y of the A to the B is 1.05≦x/y≦1.5, and wherein
a peak derived from a perovskite structure A1B1O3-δ is shown in a chart obtained by an X-ray diffraction measurement, and in Raman spectra, an area of absorption peak existing between 560 cm−1 and 620 cm−1 (inclusive) is larger than that between 380 cm−1 and 440 cm−1 (inclusive).

### Claim 2 (depends on 1)

The air electrode catalyst material according to claim 1, wherein
the perovskite oxide contains La as the A and Co as the B.

### Claim 3 (depends on 2)

The air electrode catalyst material according to claim 2, wherein
the perovskite oxide has a structure represented by a general formula (2): La(1-z)xSrzxCoyO3-δ.

### Claim 4 (depends on 3)

The air electrode catalyst material according to claim 3, wherein
a substitution rate z at which La in the A has been substituted by Sr is 0.05≦z≦0.75.

### Claim 5 (depends on 1)

A solid oxide full cell system comprising:
an air electrode containing the air electrode catalyst material according to claim 1;
a fuel electrode; and
an electrolyte body arranged between the air electrode and the fuel electrode.

### Claim 6 (depends on 5)

The solid oxide fuel cell system according to claim 5, wherein
the air electrode has: a first electrode material layer containing a first electrode material having the ratio x/y in the general formula (1) of 0.80≦x/y<1.25; and a highly-active layer that contains the air electrode catalyst material and that is laminated on the first electrode material layer.

### Claim 7

A method of manufacturing an air electrode catalyst material to be used in solid oxide fuel cells, comprising:
arranging a first electrode material and a second electrode material so as to be adjacent to each other, the first electrode material being represented by a general formula (1): AxByO3-δ (wherein, A contains at least one element selected from the group consisting of Mg, Ca, Sr, Ba, Sc, Y, and lanthanoid element; B contains at least one element selected from the group consisting of Mn, Fe, Co, and Ni; and δ indicates an amount of oxygen deficiency or oxygen excess for matching the valence number of the perovskite oxide), in which a ratio x/y of the A to the B is 0.80≦x/y<1.25, and the second electrode material having a ratio x/y of the A to the B in the general formula (1) of 1.5≦x/y≦2.5; and
calcining the first electrode material and the second electrode material, which are arranged so as to be adjacent to each other, at a temperature higher than or equal to 450° C.

### Claim 8 (depends on 7)

The method of manufacturing an air electrode catalyst material according to claim 7, wherein
the arranging the first electrode material and the second electrode material so as to be adjacent to each other includes:
forming a first electrode material layer; and forming a second electrode material layer on the first electrode material layer.

### Claim 9 (depends on 8)

The method of manufacturing an air electrode catalyst material according to claim 8 comprising:
forming the second electrode material layer by a pulse laser process, a sputtering process, or a chemical vapor deposition process.

### Claim 10 (depends on 7)

The method of manufacturing an air electrode catalyst material according to claim 7, wherein
the arranging the first electrode material and the second electrode material so as to be adjacent to each other includes: forming a first electrode material layer on an electrolyte body by a pulse laser process, a sputtering process, or a chemical vapor deposition process.