LAUSR

Abstract Nb and W co-doped SrFeO3-δ perovskite SrNb0.1W0.1Fe0.8O3-δ (SNWF) is exploited as a novel cathode for intermediate temperature solid oxide fuel cells (IT-SOFCs). SNWF has a cubic structure with Pm 3 ¯ m space group. Its thermal, electrical and electrochemical properties were examined in detail. Nb/W co-doping increased the oxygen vacancy density of SNWF in comparison with that of Nb and W single-doped SrNb0.2Fe0.8O3-δ (SNF) and SrW0.2Fe0.8O3-δ (SWF) perovskites. Nb/W co-doping resulted in the decrease of electrical conductivity and the enhancement of thermal expansion coefficients (TECs) as well as the electrochemical performance. The average TEC value during 30–1000 °С is 19.6 × 10−6 K−1 for SNWF. At 750 °C, the area specific resistance (ASR) and the maximum power density are 0.113 Ω cm2 and 832 mW cm−2 for the cells based on SNWF electrode and La0.8Sr0.2Ga0.8Mg0.1O3 (LSGM) electrolyte. Good ORR activity and output performance indicate SNWF can be a good alternative cathode material for IT-SOFC.