Optimized energy conversion efficiency in solid-oxide fuel cells implementing SrMo_{1鈭?span style='font-style: italic'>x}Fe_xO_{3鈭?span style='font-style: italic'>未} perovskites as anodes

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• 作者：R. Martí ; nez-Coronado^a ; J.A. Alonso^a ; ^{ja.alonso@icmm.csic.es} ; A. Aguadero^a ; ^b ; M.T. Ferná ; ndez-Dí ; az^c
• 关键词：IT-SOFC ; Anode ; Perovskite ; SrMoO3
• 刊名：Journal of Power Sources
• 出版年：2012
• 期刊代码：58_03787753
• 类别：ce
• 出版时间：15 June, 2012
• 卷：208
• 期：Complete
• 页码：153-158
• 文件大小：716 K

摘要

Oxides of composition SrMo_1鈭?em>xFe_xO_3鈭?em>未 (x = 0.1, 0.2) have been prepared, characterized and tested as anode materials in single solid-oxide fuel cells, yielding output powers close to 900 mW cm^鈭? at 850 掳C with pure H₂ as a fuel. This excellent performance is accounted for the results of an 鈥渋n situ鈥?neutron powder diffraction experiment, at the working temperature of the SOFC, showing the presence of a sufficiently high oxygen deficiency, with large displacement factors for oxygen atoms that suggest a large lability and mobility, combined with a huge metal-like electronic conductivity, as high as 340 S cm^鈭? at T = 50 掳C for x = 0.1. The magnitude of the electronic conductivity decreases with increasing Fe-doping content. An adequate thermal expansion coefficient, reversibility upon cycling in oxidizing-reducing atmospheres and chemical compatibility with the electrolyte make these oxides good candidates for anodes in intermediate-temperature SOFC (IT-SOFCs).