Basic properties of low thermal expansion coefficient (Y0.5Ca0.5)1-xInxBaCo3ZnO7+? (x=0, 0.1, 0.2, 0.3) solid solutions for solid oxide fuel cell cathode materials

In this investigation, In-doped (Y0.5Ca0.5)1-xInxBaCo3ZnO7+delta (x = 0, 0.1, 0.2, and 0.3, abbreviated as YCIxBCZ) swedenborgite oxides are successfully prepared, and the effects of In-doping on phase structure, electrical conductivity, TEC, thermal stability and electrochemical properties are investigated thoroughly. The partial substitution of In for Y and Ca has a slight effect on the phase structure, electrical conductivity, TEC and area -specific resistance (ASR) of YCIxBCZ. All the YCIxBCZ samples investigated show an excellent tolerance to CO2 at 800 degrees C. Additionally, the YCI0.2BCZ phase are stable after 72 h exposure to air at 600, 700, and 800 degrees C, sepa-rately, while YCIxBCZ (x = 0, 0.1 and 0.3) show instability at 700 degrees C in air. The optimal composition, YCI0.2BCZ, exhibits a relatively low ASR value (0.048 omega cm2 at 800 degrees C) and a high power density (345 mW cm-2 at 800 degrees C). The current results demonstrate that YCI0.2BCZ is promising cathode material for IT-SOFCs.