The fabrication and electrochemical activity of a type of solid oxide fuel cell (SOFC) cathode is described in this paper. In search of new cathodes a Gd0.6Sr0.4Fe0.8Co0.2O3-delta compound was synthesized using the glycine-nitrate method. It turned out that this was a two-phase compound consisting of two perovskite phases, a cubic and an orthorhombic phase, as shown by Rietveld refinements. These two phases were synthesized and a cone-shaped electrode study was undertaken. It was shown that the composite cathode had an electrochemical activity superior to that of the two single-phase perovskites, indicating that the unique microstructure of this type of cathode is essential for achieving high electrochemical activity toward the reduction of oxygen in a SOFC.
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Kammer Hansen, K., Søgaard, M., & Mogensen, M. B. (2007). Gd0.6Sr0.4Fe0.8Co0.2O3-δ: A novel type of SOFC cathode. Electrochemical and Solid-State Letters, 10(8), B119-B121. https://doi.org/10.1149/1.2743140