LAUSR

Abstract A redox-stable perovskite oxide Sm0.5Sr0.5FeO3-δ (SSF) at reduced temperatures is investigated as a new promising electrode material for symmetric solid oxide fuel cells (SSOFCs). SSF exhibits well structural stability and catalytic activity in redox atmosphere at intermediate temperatures (≤750 °C), and the electrical conductivity exhibits a semiconductor behavior both in cathode and anode atmosphere. To enhance the electrochemical performance of SSF by adding oxygen-ion conductor Gd0.1Ce0.9O2-δ (GDC), the electrode polarization resistances at 750 °C are reduced from 2.86 to 0.67 Ω cm2 in air and from 4.32 to 0.91 Ω cm2 in humidified H2, respectively. Accordingly, the cell performance of SSOFCs with SSF-GDC composite electrode is almost twice (201.74 mW cm−2 at 750 °C) of those with the single-phase one. There preliminary experimental results demonstrate SSF-based electrode materials can be new promising candidates for SSOFCs at low temperatures.