Electrochemical properties of novel SOFC dual electrode La0.75Sr0.25Cr0.5Mn0.3Ni0.2O3−δ

The perovskite La0.75Sr0.25Cr0.5Mn0.3Ni0.2O3−δ (LSCMMn0.30Ni0.20) was evaluated as potential electrode for solid oxide fuel cells. The electrochemical performances of LSCMMn0.30Ni0.20 for hydrogen oxidation and oxygen reduction reactions were studied at 800 °C. Symmetrical cells LSCMMn0.30Ni0.20/YSZ/LSCMMn0.30Ni0.20 were studied by electrochemical impedance spectroscopy. The total conductivity of LSCMMn0.30Ni0.20 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. LSCMMn0.3Ni0.2 seems to be a promising dual electrode for a symmetrical SOFC.