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Sintered electrode for solid oxide fuel cells

United States Patent

5,908,713
June 1, 1999
View the Complete Patent at the US Patent & Trademark Office
A solid oxide fuel cell fuel electrode is produced by a sintering process. An underlayer is applied to the electrolyte of a solid oxide fuel cell in the form of a slurry, which is then dried. An overlayer is applied to the underlayer and then dried. The dried underlayer and overlayer are then sintered to form a fuel electrode. Both the underlayer and the overlayer comprise a combination of electrode metal such as nickel, and stabilized zirconia such as yttria-stabilized zirconia, with the overlayer comprising a greater percentage of electrode metal. The use of more stabilized zirconia in the underlayer provides good adhesion to the electrolyte of the fuel cell, while the use of more electrode metal in the overlayer provides good electrical conductivity. The sintered fuel electrode is less expensive to produce compared with conventional electrodes made by electrochemical vapor deposition processes. The sintered electrodes exhibit favorable performance characteristics, including good porosity, adhesion, electrical conductivity and freedom from degradation.
Ruka; Roswell J. (Pittsburgh, PA), Warner; Kathryn A. (Bryan, TX)
Siemens Westinghouse Power Corporation (Orlando, FL)
08/ 934,884
September 22, 1997
GOVERNMENT CONTRACT The United States Government has rights in this invention pursuant to Contract No. DE-FC21-91MC28055 awarded by the U.S. Department of Energy.