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BaCoO2 con coordinación de cobalto tetraédrico: el elemento que falta para comprender las aplicaciones de
Aliou Diatta1, Claire V Colin2, Romain Viennois1
1ICGM, ENSCM, Université de Montpellier, CNRS, 34293 Montpellier, France.
Journal of the American Chemical Society
|May 27, 2024
Resumen
El cobalto de bario (BaCoO3-δ) exhibe una capacidad de almacenamiento de oxígeno gigante debido a la conversión estructural reversible entre BaCoO2 y BaCoO3-δ. Esta perovskita muestra un alto potencial para dispositivos de almacenamiento y conversión de energía.
Área de la Ciencia:
- Ciencias de los materiales
- Almacenamiento de energía
- Química del estado sólido
Sus antecedentes:
- Las perovskitas de cobalto de bario (BaCoO3-δ) son cruciales para el almacenamiento de energía debido a la estequiometría flexible del oxígeno.
- Su evolución estructural durante las reacciones de oxígeno sigue siendo poco explorada.
Objetivo del estudio:
- Investigar la evolución estructural del cobalto de bario durante las reacciones de oxígeno.
- Caracterice el estado de oxidación más bajo del cobalto, BaCoO2, y sus capacidades de inserción de oxígeno.
Principales métodos:
- Síntesis y caracterización de BaCoO2.
- Análisis termogravimétrico in situ junto con difracción de neutrones.
Principales resultados:
- Sintetizó BaCoO2 con una estructura trigonal y un marco CoO4-tetraédrico.
- Se ha demostrado la inserción reversible de oxígeno en BaCoO2 para formar BaCoO3-δ (0 ≤ δ ≤ 1).
- Capacidad de almacenamiento de oxígeno gigante observada debido a configuraciones electrónicas de cobalto sintonizables.
Conclusiones:
- La conversión reversible entre BaCoO2 y BaCoO3-δ, con una conductividad sostenida superior a 900 K, pone de relieve su potencial.
- Los materiales basados en BaCoO3-δ son muy prometedores para dispositivos avanzados de almacenamiento y conversión de energía.
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