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Novel Mg-Doped SrMoO3 Perovskites Designed as Anode Materials for Solid Oxide Fuel Cells

AutorCascos, Vanessa; Alonso, J. A. ; Fernández-Díaz, M. T.
Fecha de publicación19-jul-2016
EditorMultidisciplinary Digital Publishing Institute
CitaciónMaterials 9(7): 588 (2016)
ResumenSrMo<sub>1−x</sub>M<sub>x</sub>O<sub>3−δ</sub> (M = Fe and Cr, x = 0.1 and 0.2) oxides have been recently described as excellent anode materials for solid oxide fuel cells at intermediate temperatures (IT-SOFC) with LSGM as the electrolyte. In this work, we have improved their properties by doping with aliovalent Mg ions at the B-site of the parent SrMoO<sub>3</sub> perovskite. SrMo<sub>1−x</sub>Mg<sub>x</sub>O<sub>3−</sub><sub>δ</sub> (x = 0.1, 0.2) oxides have been prepared, characterized and tested as anode materials in single solid-oxide fuel cells, yielding output powers near 900 mW/cm<sup>−2</sup> at 850 °C using pure H<sub>2</sub> as fuel. We have studied its crystal structure with an “in situ” neutron power diffraction (NPD) experiment at temperatures as high as 800 °C, emulating the working conditions of an SOFC. Adequately high oxygen deficiencies, observed by NPD, together with elevated disk-shaped anisotropic displacement factors suggest a high ionic conductivity at the working temperatures. Furthermore, thermal expansion measurements, chemical compatibility with the LSGM electrolyte, electronic conductivity and reversibility upon cycling in oxidizing-reducing atmospheres have been carried out to find out the correlation between the excellent performance as an anode and the structural features.
Identificadoresdoi: 10.3390/ma9070588
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