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Air electrode composition for solid oxide fuel cell

United States Patent

August 3, 1999
View the Complete Patent at the US Patent & Trademark Office
An air electrode composition for a solid oxide fuel cell is disclosed. The air electrode material is based on lanthanum manganite having a perovskite-like crystal structure ABO.sub.3. The A-site of the air electrode composition comprises a mixed lanthanide in combination with rare earth and alkaline earth dopants. The B-site of the composition comprises Mn in combination with dopants such as Mg, Al, Cr and Ni. The mixed lanthanide comprises La, Ce, Pr and, optionally, Nd. The rare earth A-site dopants preferably comprise La, Nd or a combination thereof, while the alkaline earth A-site dopant preferably comprises Ca. The use of a mixed lanthanide substantially reduces raw material costs in comparison with compositions made from high purity lanthanum starting materials. The amount of the A-site and B-site dopants is controlled in order to provide an air electrode composition having a coefficient of thermal expansion which closely matches that of the other components of the solid oxide fuel cell.
Kuo; Lewis (Monroeville, PA), Ruka; Roswell J. (Pittsburgh, PA), Singhal; Subhash C. (Murrysville, PA)
Siemens Westinghouse Power Corporation (Orlando, FL)
08/ 995,078
December 19, 1997
STATEMENT OF GOVERNMENT INTEREST The Government of the United States of America has certain rights in this invention pursuant to contract number DE-FC21-91MC28055 awarded by the United States Department of Energy.