Copper doped lanthanum strontium ferrite showed superior kinetics for the electro-reduction of oxygen. The generic formulation was La1-xSrxCu1-yFeyO3 (LSCuF) where x ranged from 0 to 0.4 and y varied from 0 to 0.5. La1-xSrxFeO3 (LSF) without copper doping and with x equal to 0.2 is the composition currently used in our laboratory for oxygen reduction cathodes in solid oxide fuel cells. Doping with copper improved the electrocatalytic activity compared with undoped material. This improvement was confirmed with cyclic voltammetric studies on half cells and on full fuel cell tests. Copper doped materials have unusual electrochemical characteristics and copper apparently undergoes a one electron reduction at overpotentials less than -0.1 volt. This occured only in air but not in oxygen.
Revised: November 7, 2006 |
Published: September 15, 2005
Citation
Coffey G.W., J.S. Hardy, O.A. Marina, L.R. Pederson, P.C. Rieke, and E.C. Thomsen. 2005.Copper Doped Lanthanum Strontium Ferrite for Reduced Temperature Solid Oxide Fuel Cells. In Fourteenth International Conference on Solid State Ionics, Jun 22-27 2003, Monterey, CA., USA. Published in Solid State Ionics, 175, 73-78. Amsterdam:Elsevier.PNNL-SA-44931.