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Department of Chemical and Biomolecular Engineering, University of Pennsylvania, 220 South 33rd Street 311A Towne Building, Philadelphia, USA
; Fax: +1 215-573-2093
; Tel: +1 215-898-8351
J. Mater. Chem., 2012,22, 11396-11402
21 Mar 2012,
26 Apr 2012
First published online
27 Apr 2012
The physical and electrochemical properties of cerium vandates in which a portion of the cerium cations have been substituted with transition metals (Ce1−xTMxVO4−0.5x, TM = Ni, Co, Cu) were investigated and their suitability for use in solid oxide fuel cell (SOFC) anodes was assessed. Similar to other transition metal doped perovskites, the metals were found to move out of and into the oxide lattice in response to exposure to reducing and oxidizing conditions at elevated temperatures. This process produces nanoparticle metal catalysts that decorate the surface of the conductive cerium vanadate. Solid oxide fuel cells (SOFC) with Ce1−xTMxVO3–YSZ composite anodes exhibited high electrochemical activity. It was also demonstrated that doping with the alkaline earth ions, Ca2+ and Sr2+ enhances the electronic conductivity of the vanadate and Ce0.7Sr0.1Ni0.2VO3–YSZ composite SOFC anodes were found to have both high electrochemical activity and unusually high redox stability.
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Journal of Materials Chemistry
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