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Lanthanum manganite-based air electrode for solid oxide fuel cells

United States Patent

5,916,700
June 29, 1999
View the Complete Patent at the US Patent & Trademark Office
An air electrode material for a solid oxide fuel cell is disclosed. The electrode material is based on lanthanum manganite having a perovskite-like crystal structure ABO.sub.3. The A-site of the air electrode material preferably comprises La, Ca, Ce and at least one lanthanide selected from Sm, Gd, Dy, Er, Y and Nd. The B-site of the electrode material comprises Mn with substantially no dopants. The ratio of A:B is preferably slightly above 1. A preferred air electrode composition is of the formula La.sub.w Ca.sub.x Ln.sub.y Ce.sub.z MnO.sub.3, wherein Ln comprises at least one lanthanide selected from Sm, Gd, Dy, Er, Y and Nd, w is from about 0.55 to about 0.56, x is from about 0.255 to about 0.265, y is from about 0.175 to about 0.185, and z is from about 0.005 to about 0.02. The air electrode material possesses advantageous chemical and electrical properties as well as favorable thermal expansion and thermal cycle shrinkage characteristics.
Ruka; Roswell J. (Pittsburgh, PA), Kuo; Lewis (Monroeville, PA), Li; Baozhen (Essex Junction, VT)
Siemens Westinghouse Power Corporation (Orlando, FL)
09/ 012,778
January 23, 1998
STATEMENT OF GOVERNMENT INTEREST The Government of the United States of America has certain rights in this invention pursuant to Contract No. DE-FC21-91MC28055 awarded by the U.S. Department of Energy.