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Título: | Effect of the synthesis conditions on the properties of La0.15Sm0.35Sr0.08Ba0.42FeO3 − δ cathode material for SOFCs |
Autor: | Vidal, Karmele; Larrañaga, Aitor; Morán-Ruiz, Aroa; Laguna-Bercero, M. A. CSIC ORCID ; Baker, Robert J.; Arriortua, María Isabel | Palabras clave: | Chemical synthesis Oxygen content SOFC Cathode material Impedance spectroscopy |
Fecha de publicación: | 2017 | Editor: | Elsevier | Citación: | Powder Technology 322: 131-139 (2017) | Resumen: | The perovskite La0.15Sm0.35Sr0.08Ba0.42FeO3 − δ has been prepared by the glycine nitrate (GNC) route, varying the fuel/oxidizer ratio (glycine/nitrate, G/N = 1 and 2) and cooling rate (slow cooling and air-quenched), in order to study the influence of sample preparation on the materials' properties, in the context of their application as a cathode material for SOFCs. For this, the performance of the prepared mixed ion and electron conducting perovskite oxides is dictated by their structure, oxygen stoichiometry (3 − δ), chemical composition and thermal expansion properties. High-resolution Synchrotron X-ray powder diffraction patterns were collected at room temperature and at 700 and 800 °C. It was found that the materials had a cubic crystal structure at these temperatures. As expected, 3 − δ decreased as temperature increased, and was slightly smaller for the quenched sample. Higher electrical conductivity values were obtained for the sample with G/N = 1 (air-quenched) in the cooling rate. At 700 and 800 °C the cathode synthesized with G/N = 1 and air-quenched showed the smallest polarization resistance values in impedance spectroscopy studies. Therefore, the physicochemical and electrochemical characterization clearly demonstrated the influence of the synthetic conditions on the cathode performance. | Versión del editor: | https://doi.org/10.1016/j.powtec.2017.09.020 | URI: | http://hdl.handle.net/10261/181920 | DOI: | 10.1016/j.powtec.2017.09.020 | ISSN: | 0032-5910 | E-ISSN: | 1873-328X |
Aparece en las colecciones: | (ICMA) Artículos |
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