Medium-Entropy SrV 1/3 Fe 1/3 Mo 1/3 O 3 with High Conductivity and Strong Stability as SOFCs High-Performance Anode

• Published in: Materials 2022-03, Vol.15 (6)
• Main Authors: Ma, Guanjun, Chen, Dezhi, Ji, Shuaijing, Bai, Xinyun, Wang, Xinjian, Huan, Yu, Dong, Dehua, Hu, Xun, Wei, Tao
• Format: Article
• Language: English
• ISSN: 1996-1944; 1996-1944
• DOI: 10.3390/ma15062298

Perovskite oxides using solid oxide fuel cells (SOFCs) anodes should possess high chemical stability, adequate electronic conductivity and excellent catalytic oxidation for fuel gas. In this work, the medium-entropy SrV Fe Mo O (SVFMO) with Fe, V and Mo co-existing in the B site of a perovskite structure was fabricated in reducing 5% H /Ar mixed gas: (1) SVFMO demonstrates more stable physicochemical properties when using SOFCs anodes in a reducing environment; (2) the co-existence of Fe, V and Mo in SVFMO forms more small-polaron couples, demonstrating greatly enhanced electronic conductivity. With SVFMO in a porous structure (simulating the porous anode layer), its electronic conductivity can also reach 70 S cm when testing at 800 °C in an H atmosphere; (3) SVFMO with more oxygen vacancies achieves higher catalytic ability for fuel gas, as an SOFCs anode layer demonstrates 720 mW cm at 850 °C.