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Título: | Novel Mg-Doped SrMoO3 Perovskites Designed as Anode Materials for Solid Oxide Fuel Cells |
Autor: | Cascos, Vanessa CSIC ORCID; Alonso, J. A. CSIC ORCID; Fernández-Díaz, M. T. | Fecha de publicación: | 19-jul-2016 | Editor: | Multidisciplinary Digital Publishing Institute | Citación: | Materials 9(7): 588 (2016) | Resumen: | SrMo<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. | URI: | http://hdl.handle.net/10261/142098 | DOI: | 10.3390/ma9070588 | Identificadores: | doi: 10.3390/ma9070588 |
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