Characterization of Ta/W co-doped SrFeO3-δ perovskite as cathode for solid oxide fuel cells

• Published in: Journal of alloys and compounds 2019-08, Vol.797, p.205-212
• Main Authors: Yao, Chuangang, Zhang, Haixia, Dong, Yujuan, Zhang, Rongyu, Meng, Jian, Meng, Fanzhi
• Format: Article
• Language: English
• Subjects: Cathodes; Co-doped perovskite; Crystal structure; Doping; Electrochemical analysis; Electrochemical performance; Electrode materials; Electrolytic cells; Maximum power density; Perovskites; Solid oxide fuel cell; Solid oxide fuel cells; Strontium ferrite cathode; Thermal expansion
• ISSN: 0925-8388; 1873-4669
• DOI: 10.1016/j.jallcom.2019.05.096

Ta5+ and W6+ co-doped perovskite SrTa0.1W0.1Fe0.8O3-δ (STWF) is studied as a novel cathode material of solid oxide fuel cells (SOFCs). The synergistic effects of Ta/W co-doping on the crystal structure, thermal, electrical and electrochemical properties of STWF were investigated systematically. Ta/W co-doping increased the concentration of oxygen vacancy in STWF, leading to the increase of thermal expansion coefficients (TECs) and electrochemical performance. The average TEC of STWF is 19.8 × 10−6 K−1 during 30–1000°С. At 800 °C, the area specific resistance (ASR) and the maximum power density are 0.074 Ω cm2 and 967 mW cm−2 for STWF cathode based on La0.8Sr0.2Ga0.8Mg0.1O3 (LSGM) electrolyte. The results reveal that high stable valence elements Ta5+ and W6+ co-doped STWF is a good cathode candidate for SOFC. [Display omitted] •Ta/W co-doped STWF perovskite is studied as SOFC cathode.•STWF exhibits good chemical compatibility with LSGM electrolyte.•Ta/W co-doping can increase the oxygen vacancy density in STWF.•STWF presents good ORR activity and fuel cell performance.