Variation of structure and properties of La1-xSrxCo0.2Fe0.8O3-δ with Sr content: Implications for oxidation activity

• Published in: Journal of molecular catalysis. A, Chemical Chemical, 2011-02, Vol.336 (1-2), p.23-33
• Main Authors: LAKSHMINARAYANAN, Nandita, KUHN, John N, CHOI, Hyunkyu, MILLET, Jean-Marc M, OZKAN, Umit S
• Format: Article
• Language: English
• Subjects: Applied sciences; Catalysis; Chemical Sciences; Chemistry; Energy; Energy. Thermal use of fuels; Environment and Society; Environmental Sciences; Equipments for energy generation and conversion: thermal, electrical, mechanical energy, etc; Exact sciences and technology; Fuel cells; General and physical chemistry; Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry
• ISSN: 1381-1169; 1873-314X
• DOI: 10.1016/j.molcata.2010.12.006

The bulk structure, surface characteristics and catalytic properties of Fe-based perovskite-type oxides with the formula La1-xSrxCo0.2Fe0.8O3-delta for x=0.2. 0.4, 0.6 and 0.8 have been investigated as potential anode catalysts for solid oxide fuel cells. The properties were found to strongly depend upon Sr-content, temperature, and environment. The bulk structure shifted towards being oxygen deficient and cubic under atmospheric conditions as the Sr content increased. The oxygen activation was found to be a strong function of Sr content with the catalysts being more active and having a lower activation energy for Sr-rich La1-xSrxCo0.2Fe0.8O3-delta. The materials showed good activity for methane oxidation forming only complete oxidation products and showing no propensity to coke formation, making them a stable potential anode catalyst for SOFCs. (C) 2010 Elsevier B.V. All rights reserved.