A cobalt-free electrode material La0.5Sr0.5Fe0.8Cu0.2O3 − δ for symmetrical solid oxide fuel cells.

Cobalt-free perovskite oxide La 0.5 Sr 0.5 Fe 0.8 Cu 0.2 O 3 − δ (LSFC) was applied as both anode and cathode for symmetrical solid oxide fuel cells (SSOFCs). The LSFC shows a reversible transition between a cubic perovskite phase in air and a mixture of SrFeLaO 4 , a K 2 NiF 4 -type layered perovskite oxide, metallic Cu and LaFeO 3 in reducing atmosphere at elevated temperature. The average thermal expansion coefficient of LSFC in air is 17.7 × 10 − 6 K − 1 at 25 °C to 900 °C. By adopting LSFC as initial electrodes to fabricate electrolyte supported SSOFCs, the cells generate maximum power output of 1054, 795 and 577 mW cm − 2 with humidified H 2 fuel (~ 3% H 2 O) and 895, 721 and 482 mW cm − 2 with humidified syngas fuel (H 2 :CO = 1:1) at 900, 850 and 800 °C, respectively. Moreover, the cell with humidified H 2 fuel demonstrates a reasonable stability at 800 °C under 0.7 V for 100 h. [ABSTRACT FROM AUTHOR]