Abstract
Preparation, thermal expansion, electrical conductivity and polarization of A2−αAα′BO4-type oxides (A=Pr, Sm, A′=Sr, B=Fe, Co) were investigated systematically to evaluate their potential as cathode materials for IT-SOFCs. Within 0.8≤α≤1.5, A2−αSrαBO4−δ (A=Pr, Sm, B=Fe, Co) could be obtained as a single K2NiF4-structural phase. Thermal expansion coefficients (TECs) of the specimens increase with increasing Sr2+ content, TECs of cobaltites are much higher than that of ferrites. The electrical conductivity of cobaltites is in the order of 102 S cm−1 near 800 °C, which is acceptable for the cathode of IT-SOFC. Polarization measurements showed that Sm0.5Sr1.5CoO4−δ exhibited the lowest cathodic overpotential at 700–900 °C (72 mV at 500 mA/cm2 at 800 °C), being a high potential candidate of cathode material for IT-SOFCs.
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