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Pure Appl. Chem., 2008, Vol. 80, No. 11, pp. 2543-2552

http://dx.doi.org/10.1351/pac200880112543

B-site substituted lanthanum strontium ferrites as electrode materials for electrochemical applications

Ulrich F. Vogt1,2, Josef Sfeir3, Joerg Richter4, Christian Soltmann4 and Peter Holtappels4

1 Laboratory of Hydrogen and Energy, EMPA, Swiss Federal Laboratories for Materials Testing and Research, Ueberlandstr. 129, 8600 Duebendorf, Switzerland
2 Department of Crystallography, University of Freiburg, D-79104 Freiburg, Germany
3 Hexis Ltd., CH 8404, Winterthur, Switzerland
4 Laboratory of High Performance Ceramics, EMPA, Swiss Federal Laboratories for Materials Testing and Research, Ueberlandstr. 129, 8600 Duebendorf, Switzerland

Abstract: For electrochemical systems such as solid oxide fuel cells (SOFCs) or solid oxide electrolyzer cells (SOECs), perovskites are widely used as cathode material for the reduction of molecular oxygen. At present, strontium-substituted lanthanum manganite, La1-xSrxMnO3-δ (LSM), is used as standard SOFC cathode material for operation at high temperatures, whereas strontium-substituted lanthanum ferrite (LSF) is alternatively explored for medium-temperature SOFCs. Moreover, LSF is considered to be a potential candidate for oxygen separation membranes as the material reported interesting electrical properties. The design of new perovskite-type La transition-metal oxides is of significant technological importance in order to reduce the operating temperature to 600-800 °C and thus to reduce the SOFC system cost. For investigations on a new material class, (La1-xSrx)yFe1-z(Ni,Cu)zO3-δ was synthesized by a spray-pyrolysis process and modified on the A-site in both stoichiometric and non-stoichiometric configurations and on the B-site by substituting Fe with Ni and Cu.