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Alta conductividad de protones en Ba5Er2Al2ZrO13, un óxido hexagonal relacionado con la perovskita con capas
Taito Murakami1, James R Hester2, Masatomo Yashima1
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
|May 16, 2020
Resumen
Un nuevo óxido hexagonal relacionado con la perovskita, Ba5Er2Al2ZrO13, muestra una excelente conductividad de protones. Este descubrimiento abre caminos para nuevos conductores de protones en aplicaciones de energía.
Área de la Ciencia:
- Ciencias de los materiales
- Química del estado sólido
- La electroquímica
Sus antecedentes:
- La conductividad de protones en electrolitos es vital para dispositivos electroquímicos como las pilas de combustible.
- Los conductores de protones existentes están limitados a familias estructurales específicas, como las perovskitas cúbicas.
- Se requiere una alta conductividad de protones a temperaturas intermedias (300-600 °C).
Objetivo del estudio:
- Para identificar y caracterizar una nueva clase de conductores de protones.
- Explorar los óxidos hexagonales relacionados con la perovskita para mejorar la conductividad de los protones.
- Para entender el mecanismo de transporte de protones en el nuevo material.
Principales métodos:
- Síntesis y caracterización de Ba5Er2Al2ZrO13.
- Difracción de neutrones con el análisis de Rietveld.
- Cálculos de energía basados en la valencia del enlace.
- Análisis termogravimétrico (TGA).
Principales resultados:
- Se sintetizó Ba5Er2Al2ZrO13, un óxido hexagonal relacionado con la perovskita.
- Se observaron conductividades de protones superiores a 10^-3 S cm^-1 entre 300 y 1200 °C.
- La difracción de neutrones y los cálculos confirmaron la incorporación de protones en la capa h' deficiente en oxígeno.
Conclusiones:
- Ba5Er2Al2ZrO13 representa una nueva familia estructural de conductores de protones.
- La capa h' deficiente en oxígeno es clave para el transporte de protones.
- Este hallazgo proporciona una estrategia para diseñar conductores de protones avanzados basados en óxidos hexagonales relacionados con la perovskita.
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