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Diseño universal de compuestos de alta entropía guiado por el marco estructural para una catálisis energética
1School of Materials Science and Engineering, Tianjin Key Laboratory of Composite and Functional Materials, Key Laboratory of Advanced Ceramics and Machining Technology (Ministry of Education), Tianjin University, Tianjin300350, P. R. China.
Journal of the American Chemical Society
|December 26, 2022
Resumen
Los investigadores desarrollaron una nueva estrategia para crear compuestos estables de alta entropía mediante el uso de sitios bimetálicos para estabilizar diversos elementos. Este enfoque permite la síntesis de materiales complejos como los hidróxidos de perovskita de alta entropía (HEPH) con potencial para la electrocatálisis.
Área de la Ciencia:
- Ciencias de los materiales
- Química
- La física
Sus antecedentes:
- Los compuestos de alta entropía (HEC) ofrecen propiedades únicas de múltiples elementos, pero se enfrentan a desafíos de síntesis y estabilidad.
- La complejidad de la mezcla multicomponente dificulta el diseño universal de HEC estables con diversas composiciones y estructuras.
Objetivo del estudio:
- Proponer una estrategia de diseño general para lograr la estabilidad y la síntesis de compuestos de alta entropía.
- Demostrar la aplicabilidad de esta estrategia en varias familias de compuestos.
Principales métodos:
- Una estrategia de diseño que utiliza sitios bimetálicos dentro de marcos compuestos para estabilizar elementos adicionales.
- Síntesis de varios compuestos metálicos típicos con sitios bimetálicos, incluidos los hidróxidos de perovskita, los hidróxidos dobles en capas, los sulfuros de espinela, los fluoruros de perovskita y los óxidos de espinela.
- Caracterización de compuestos de alta entropía sintetizados, centrándose en los hidróxidos de perovskita de alta entropía (HEPH).
Principales resultados:
- Síntesis exitosa de varios compuestos de alta entropía utilizando la estrategia de estabilización del sitio bimetálico propuesta.
- Demostración de HEPH sintetizados con una amplia gama de componentes, incluidas las composiciones septenarias.
- Se observó una actividad significativa de evolución del oxígeno en los HEPH sintetizados.
Conclusiones:
- La estrategia de diseño propuesta proporciona una plataforma general para el desarrollo de compuestos estables de alta entropía.
- Este enfoque facilita la creación de nuevos sistemas compuestos de alta entropía con un potencial significativo para aplicaciones, en particular en la electrocatálisis.
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