# US 7,608,357 B2 · Fuel electrode material, a fuel electrode, and a solid oxide fuel cell

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- Number: US 7,608,357 B2
- Document ID: US7608357B2
- Status: Granted
- Kind: B2
- Application number: 11/283,492
- Filed: 2005-11-18
- Published: 2006-05-25
- Granted: 2009-10-27
- Earliest claimed: 2004-11-19
- Assignees: Toho Gas Co., Ltd.; Sumitomo Metal Mining Co., Ltd.
- Inventors: Kenji Ukai; Yasunobu Mizutani; Kouji Hisada; Misuzu Yokoyama; Shoji Futaki; Hiroyuki Toya
- Web page: https://patentgrep.com/patent/US7608357B2

## CPC

- H01M 4/8885: {Sintering or firing}
- H01M 4/9025: {Oxides specially used in fuel cell operating at high temperature, e.g. SOFC}
- H01M 8/1253: the electrolyte containing zirconium oxide
- H01M 2008/1293: {Fuel cells with solid oxide electrolytes}
- Y02E 60/50: Fuel cells
- Y02P 70/50: Manufacturing or production processes characterised by the final manufactured product
- 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
- Y02P: CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS

## Abstract

A powder material for a fuel electrode of a solid oxide fuel cell is provided, along with a fuel electrode for a solid oxide fuel cell prepared by sintering the fuel electrode powder material, and a solid oxide fuel cell including the fuel electrode. The fuel electrode powder material includes a nickel based powder material containing at least one of nickel and nickel oxide and at least one of titanium oxide (IV) and a titanium source capable of changing into titanium oxide (IV) by heat treatment in air.

## Claims

### Claim 1

A powder fuel electrode material for a fuel electrode of a solid oxide fuel cell, the powder fuel electrode material consisting essentially of a mixture of:
a nickel-based powder material comprising at least one of nickel and nickel oxide; and
at least one of titanium oxide (IV) and a titanium source capable of changing into titanium oxide (IV) by heat treatment in air mixed into the nickel-based material powder;
wherein the powder fuel electrode material further contains a solid electrolyte exhibiting oxide ion conductivity, which comprises one of stabilized zirconia containing one or more oxide materials selected from the groups consisting of Sc2O3, Y2O3, CeO2, CaO, MgO, a ceria solid solution containing at least one of Sm2O3, Gd2O3 and Y2O3, and Bi2O3, mixed into the powder fuel electrode material after the at least one of titanium oxide (IV) and the titanium source is mixed into the nickel-based powder material; and
wherein the powder fuel electrode material contains 35 to 70 wt % of the solid electrolyte with respect to nickel oxide.

### Claim 2 (depends on 1)

The powder fuel electrode material according to claim 1, wherein the powder fuel electrode material comprises 0.01 to 10 wt % of the at least one of the titanium oxide (IV) and the titanium source in terms of titanium oxide (IV) with respect to nickel oxide.

### Claim 3 (depends on 2)

The powder fuel electrode material according to claim 2, wherein a rate of change of a length accompanied by oxidation-reduction of a sintered body prepared by sintering the powder fuel electrode material is 0.3% or less, as measured by a thermomechanical analyzer.

### Claim 4 (depends on 1)

The powder fuel electrode material according to claim 1, wherein a rate of change of a length accompanied by oxidation-reduction of a sintered body prepared by sintering the powder fuel electrode material is 0.3% or less, as measured by a thermomechanical analyzer.

### Claim 5 (depends on 4)

A fuel electrode for a solid oxide fuel cell prepared by sintering the powder fuel electrode material according to claim 4.

### Claim 6 (depends on 1)

A fuel electrode for a solid oxide fuel cell prepared by sintering the powder fuel electrode material according to claim 1.

### Claim 7 (depends on 6)

A solid oxide fuel cell comprising the fuel electrode according to claim 6.

### Claim 8 (depends on 1)

The powder fuel electrode material according to claim 1, wherein the powder fuel electrode material comprises at least the titanium source capable of changing into titanium oxide (IV) by heat treatment in air.