Pervoskite-type BaCo0.7Fe0.2Ta0.1O3-δ cathode for proton conducting IT-SOFC

This paper presents Pervoskite-type BaCo0.7Ta0.1Fe0.2O3-delta (BCTF) cathode for intermediate temperature proton conducting solid oxide fuel cells (SOFCs). BCTF with cubic phase shows excellent structural stability and adequate chemical stability against CO2/H2O in contrast to BaCo0.8Fe0.2O3-delta. Conductivity of BCTF reaches above 10 S cm(-1) in air at intermediate temperatures. Composite cathode polarization resistance (BCTF/BaZr0.1Ce0.7Y0.2O3-delta) in a symmetric cell based on proton conducting BaZr0.1Ce0.7Y0.2O3-delta (BCZY) electrolyte was as low as 0.1 Omega cm(2) at 700 degrees C. The maximum output of anode-supported thin-film SOFC with BCTF/BCZY composite cathode and BCZY electrolyte reaches 255 mW cm(-2) when employing humidified H-2 as fuel and static air as oxidizer. (c) 2010 Elsevier BM. All rights reserved.