Ba0.9Sr0.1Co0.9In0.1O3−δ perovskite as cathode material for IT-SOFC

The cubic perovskite phase, Ba0.9Sr0.1Co0.9In0.1O3−δ (BSCI), has been investigated as an alternative cathode material for intermediate-temperature solid oxide fuel cells (IT-SOFCs). The BSCI exhibited a good chemical compatibility with the Ce0.8Sm0.2O1.9 (SDC) electrolyte at 1000 °C for 5 h. The In-doping resulted in a dramatic reduced thermal expansion coefficient. Its electrical conductivity is 8.7-13.6 S cm−1 over the temperature range of 600-800 °C. The area specific polarization resistance of BSCI cathode in air are 0.079 Ω cm2, 0.151 Ω cm2, and 0.376 Ω cm2 at 700 °C, 650 °C and 600 °C, respectively. Maximum power density as high as 565 mW cm−2 at 800 °C. Preliminary results imply that BSCI is a promising cathode candidate for IT-SOFCs.