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Solid oxide fuel cell cathode material

United States Patent Application

View the Complete Application at the US Patent & Trademark Office
Oak Ridge National Laboratory - Visit the Partnerships Directorate Website
A solid oxide fuel cell includes a porous anode, a dense electrolyte in contact with the porous anode, and a porous cathode in contact with the dense electrolyte. The porous cathode is characterized by a single-phase structure of Brownmillerite or Srebrodolskite, the composition thereof having the formula (Ca.sub.2-xA.sub.x)(Fe.sub.2-yB.sub.y)O.sub.5.+-.z wherein: A is at least one element selected from the group: rare earth elements, Bi, and alkaline elements; B is at least one element selected from the group: Al, Ga, In, Mg, Si, and transition metal elements; 0.ltoreq.x<2; 0.ltoreq.y<2; and z is a variable, the value of which is such that the overall composition has a generally neutral charge state.
Armstrong, Timothy R. (Clinton, TN), Payzant, Edward A. (Oak Ridge, TN), Speakman, Scott A. (Lowell, MA)
11/ 369,087
March 6, 2006
[0001] The United States Government has rights in this invention pursuant to contract no. DE-AC05-00OR22725 between the United States Department of Energy and UT-Battelle, LLC.