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

The bulk structure, surface characteristics and catalytic properties of Fe-based perovskite-type oxides with the formula La1−xSrxCo0.2Fe0.8O3−δ 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−δ. 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.

The bulk and surface characteristics and catalytic properties of Fe-based perovskite-type oxides with the formula La1−xSrxCo0.2Fe0.8O3−δ have been investigated as potential anode catalysts for solid oxide fuel cells.Figure optionsDownload high-quality image (79 K)Download as PowerPoint slideResearch highlights▶ The effect of Sr loading on the bulk structure, surface characteristics and catalytic properties of Fe-based perovskite-type oxides has been examined. ▶ Sr loading is shown to impact oxygen non-stoichiometry and the transition to cubic structure. ▶ These materials show high resistance to coking, making them potential candidates as SOFC anodes.