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Composite solid oxide fuel cell anode based on ceria and strontium titanate

United States Patent

December 23, 2008
View the Complete Patent at the US Patent & Trademark Office
Pacific Northwest National Laboratory - Visit the Technology Commercialization Program Website
Oxide-based SOFC Anode Materials
An anode and method of making the same wherein the anode consists of two separate phases, one consisting of a doped strontium titanate phase and one consisting of a doped cerium oxide phase. The strontium titanate phase consists of, where M is either yttrium (Y), scandium (Sc), or lanthanum (La), where "x" may vary typically from about 0.01 to about 0.5, and where .delta. is indicative of some degree of oxygen non-stoichiometry. A small quantity of cerium may also substitute for titanium in the strontium titanate lattice. The cerium oxide consists of, where N is either niobium (Nb), vanadium (V), antimony (Sb) or tantalum (Ta) and where "y" may vary typically from about 0.001 to about 0.1 and wherein the ratio of Ti in said first phase to the sum of Ce and N in the second phase is between about 0.2 to about 0.75. Small quantities of strontium, yttrium, and/or lanthanum may additionally substitute into the cerium oxide lattice. The combination of these two phases results in better performance than either phase used separately as an anode for solid oxide fuel cell or other electrochemical device.
Marina; Olga A. (Richland, WA), Pederson; Larry R. (Richland, WA)
Battelle Memorial Institute (Richland, WA)
10/ 897,521
July 23, 2004
STATEMENT OF GOVERNMENT SUPPORT This invention was made with United States Government support under Contract DE-AC06-76RL01830 awarded by the U.S. Department of Energy. The United States Government has certain rights in the invention.