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Estabilización del hexaaminobenzeno en un marco metal-orgánico conductor 2D para el almacenamiento de sodio de alta
Jihye Park, Minah Lee, Dawei Feng
1Berzelii Centre EXSELENT on Porous Materials, Department of Materials and Environmental Chemistry , Stockholm University , Stockholm SE-106 91 , Sweden.
Journal of the American Chemical Society
|July 26, 2018
Resumen
Un nuevo marco metálico-orgánico basado en cobalto (MOF) ofrece una mayor conductividad y estabilidad para las baterías recargables. Este material permite una reacción redox de tres electrones, lo que es prometedor para aplicaciones de almacenamiento de iones de sodio de alta potencia.
Área de la Ciencia:
- Ciencias de los materiales
- La electroquímica
- Nanotecnología
Sus antecedentes:
- Los materiales orgánicos redox-activos son prometedores para las baterías recargables, pero sufren de mala conductividad y estabilidad.
- El desarrollo de materiales de electrodos estables con alta conductividad electrónica es crucial para el almacenamiento de energía avanzado.
Objetivo del estudio:
- Informar sobre un nuevo marco metal-orgánico conductor 2D basado en cobalto (MOF), Co-HAB.
- Investigar su potencial como material de electrodo de alto rendimiento para el almacenamiento de iones de sodio.
Principales métodos:
- Síntesis de un marco metal-orgánico conductor en 2D basado en cobalto (MOF) utilizando hexaaminobenzeno (HAB) y Co (II).
- Caracterización electroquímica para evaluar el comportamiento redox, la conductividad y la capacidad de tasa.
- Ajuste de las propiedades del material a través de modificaciones sintéticas.
Principales resultados:
- Se logró una conductividad eléctrica masiva de 1,57 S cm-1 en el Co-HAB sintetizado.
- Demostró una reacción redox reversible de tres electrones por HAB, una primera para este vinculante.
- Capacidad de alta velocidad exhibida con 214 mAh g-1 en 7 min y capacidad de área de 2,6 mAh cm-2 a alta carga de masa.
Conclusiones:
- Co-HAB muestra una estabilidad excepcional y sitios activos accesibles para el almacenamiento de energía.
- El material presenta un nuevo electrodo prometedor para baterías de iones de sodio de alta potencia.
- La afinidad sintética permite optimizar la conductividad y el rendimiento.
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