Abstract

The perovskite La_0.75Sr_0.25Cr_0.5Mn_0.3Ni_0.2O_3−δ (LSCMMn_0.30Ni_0.20) was evaluated as potential electrode for solid oxide fuel cells. The electrochemical performances of LSCMMn_0.30Ni_0.20 for hydrogen oxidation and oxygen reduction reactions were studied at 800 °C. Symmetrical cells LSCMMn_0.30Ni_0.20/YSZ/LSCMMn_0.30Ni_0.20 were studied by electrochemical impedance spectroscopy. The total conductivity of LSCMMn_0.30Ni_0.20 is 22 S cm⁻¹ in air and 0.8 S cm⁻¹ under wet 5% H₂/Ar at 800 °C. The area specific resistance (ASR) at 800 °C for hydrogen oxidation reaction is 1 Ω cm². The ASR for oxygen reduction reaction is 1.6 Ω cm². An ageing study during 24 h shows a relatively good stability of the electrochemical performances. LSCMMn_0.3Ni_0.2 seems to be a promising dual electrode for a symmetrical SOFC.