Effects of the electrode configuration, phase relationship and microstructure on the polarization resistance of La0.3Ba0.7CoO3−δ as cathode material for IT-SOFC
The polarization resistance of La0.3Ba0.7CoO3−δ (LBC7) as cathode material was studied by impedance spectroscopy measurements in the temperature range of 450 ≤ T ≤ 750 °C, in air, on samples prepared by the solid state reaction (SSR) method and a wet chemical (WC) route, using symmetrical cells with...
| Autores: | , , |
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| Tipo de recurso: | artículo |
| Estado: | Versión publicada |
| Fecha de publicación: | 2014 |
| País: | Argentina |
| Institución: | Consejo Nacional de Investigaciones Científicas y Técnicas |
| Repositorio: | CONICET Digital (CONICET) |
| Idioma: | inglés |
| OAI Identifier: | oai:ri.conicet.gov.ar:11336/29821 |
| Acceso en línea: | http://hdl.handle.net/11336/29821 |
| Access Level: | acceso abierto |
| Palabra clave: | Oxidos Conductores Mixtos Perovskitas Cátodos Sofc https://purl.org/becyt/ford/2.5 https://purl.org/becyt/ford/2 |
| Sumario: | The polarization resistance of La0.3Ba0.7CoO3−δ (LBC7) as cathode material was studied by impedance spectroscopy measurements in the temperature range of 450 ≤ T ≤ 750 °C, in air, on samples prepared by the solid state reaction (SSR) method and a wet chemical (WC) route, using symmetrical cells with single-layer and graded composition electrodes. While the LBC7 sample prepared by the SSR method and cooled at a rate of 10 °C/min turned out to be single phase with cubic symmetry, the sample prepared by the WC route is a mixture of the cubic phase and the 2H hexagonal phase. The lowest polarization resistance at 600 °C, Rp ∼ 0.06 Ω cm2, was obtained for the graded composition electrodes. Our results suggest that the electrode configuration is a key factor in order to reduce the polarization resistance of the LBC7 electrode material. |
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