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Conducción de protones altos en las capas octaédricas de óxidos hexagonales relacionados con la perovskita totalmente
Kohei Matsuzaki1, Kei Saito1, Yoichi Ikeda2
1Department of Chemistry, School of Science, Tokyo Institute of Technology, 2-12-1-W4-17, O-okayama, Meguro-ku, Tokyo 152-8551, Japan.
Journal of the American Chemical Society
|June 25, 2024
Resumen
Los nuevos óxidos hexagonales relacionados con la perovskita muestran una alta conductividad de protones y estabilidad química. Estos materiales son prometedores para las pilas de combustible y sensores debido a su estructura única y propiedades de hidratación.
Área de la Ciencia:
- Ciencias de los materiales
- Química del estado sólido
- La electroquímica
Sus antecedentes:
- Los conductores de protones son cruciales para aplicaciones de energía como células de combustible, células de electrólisis y sensores.
- Los materiales existentes a menudo carecen de suficiente conductividad de protones y estabilidad química a temperaturas intermedias.
- El desarrollo de nuevos materiales conductores de protones es esencial para avanzar en estas tecnologías.
Objetivo del estudio:
- Sintetizar y caracterizar una nueva serie de óxidos hexagonales relacionados con la perovskita, Ba5RE2Al2SnO13 (RE = Gd, Dy, Ho, Y, Er, Tm, Yb).
- Evaluar la conductividad de protones y la estabilidad química de estos nuevos materiales.
- Comprender la relación entre la estructura del material, la hidratación y las propiedades de transporte de protones.
Principales métodos:
- Síntesis de óxidos hexagonales relacionados con la perovskita.
- Difracción de neutrones y análisis termogravimétrico para determinar las propiedades estructurales y de hidratación.
- Mediciones de conductividad eléctrica en diversas condiciones atmosféricas para evaluar la conductividad de los protones y la estabilidad química.
Principales resultados:
- Ba5Er2Al2SnO13 demostró una alta conductividad de protones (0,01 S cm-1 a 303 °C) sin dopaje.
- La alta conductividad de protones se atribuye a la alta concentración de protones (hidratación completa y vacantes de oxígeno) y la rápida migración de protones en capas octaédricas.
- Ba5Er2Al2SnO13 exhibió una excelente estabilidad química en atmósferas húmedas de O2, aire, H2 y CO2.
Conclusiones:
- Ba5Er2Al2SnO13 se identifica como un conductor de protones superior debido a su alta conductividad y estabilidad.
- La serie de óxidos hexagonales relacionados con la perovskita (Ba5RE2Al2SnO13) muestra potencial para una alta conductividad de protones.
- El desarrollo de materiales hexagonales relacionados con la perovskita altamente deficientes en oxígeno con hidratación eficiente y migración de protones es una estrategia prometedora para los conductores de protones de próxima generación.
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