An excellent bismuth-doped perovskite cathode with high activity and CO resistance for solid-oxide fuel cells operating below 700 °C.

Lowering the operating temperatures of solid-oxide fuel cells (SOFCs) is critical, although achieving success in this endeavor has proven challenging. Herein, BiSrCoFeO (BiSCF) is systematically evaluated as a carbon dioxide (CO)-tolerant and highly active cathode for SOFCs. BiSCF, which features Bi with an ionic radius similar to Ba, exhibits activity (e.