A-site deficient Ba(1_x)Co_(0.7)Fe_(0.2)Ni_(0.1)O_(3-δ) cathode for intermediate temperature SOFC

摘要

A-site cation-deficient Ba(1_x)Co_(0.7)Fe_(0.2)Ni_(0.1)O_(3-δ) (B_(1-x)CFN, x- 0.00-0.15) oxides are synthesized and evaluated as cathode materials for intermediate temperature solid oxide fuel cells (IT-SOFCs). The reactivity between B_(1_X_CFN and gadolinia doped ceria (GDC) is observed at different temperature, and no second phase is detected under 1050℃. The increasing in A-site cation deficiency results in a steady decrease in cathode polarization resistance. Among the various B_(1_x)CFN oxides test, GDC based anode supported cells with B0.9CFN cathode possess the smallest interfacial polarization resistance (R_p). The R_p is as low as 0.283 and 0.046 Ω cm~2 at 500 and 600 C, respectively. The anode supported cell with B0.9CFN provides maximum power densities of 1062 and 1139mWcm~2 at 600 and 650 ℃. respectively. The results suggest that B0.9CFN is a great potential cathode material for IT-SOFCs.