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C y N Complejo Co-C-N derivado de coordinación híbrido como electrocatalisador altamente eficiente para la reacción

Zhong-Li Wang¹, Xian-Feng Hao², Zheng Jiang³

¹State Key Laboratory of Rare Earth Resource Utilization, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences , Changchun, 130022, China.

Journal of the American Chemical Society

|November 12, 2015

Resumen

Un nuevo catalizador de cobalto-carbono-nitrógeno produce eficientemente hidrógeno a través de la reacción de evolución del hidrógeno (HER). Este catalizador abundante en la tierra ofrece una alta actividad y estabilidad para aplicaciones de energía renovable.

Área de la Ciencia:

Ciencias de los materiales
La electroquímica
Energía renovable

Sus antecedentes:

El desarrollo de electrocatalizadores eficientes para la reacción de evolución del hidrógeno (HER) es crucial para la división del agua y el almacenamiento de energía renovable.
Los catalizadores abundantes en la tierra son muy deseables para reemplazar a los costosos catalizadores de metales nobles.
Los catalizadores actuales a menudo enfrentan desafíos con la actividad, la estabilidad o el costo.

Objetivo del estudio:

Desarrollar un catalizador HER altamente eficiente y estable utilizando elementos abundantes en la tierra.
Para investigar un nuevo material de carbono enlazado con el complejo Co-C-N para HER.
Comprender el mecanismo catalítico a través de métodos experimentales y computacionales.

Principales métodos:

Síntesis de un material poroso tridimensional de Co-C-N autoportante.
Caracterización electroquímica del catalizador para el rendimiento de HER (sobrepotencial, estabilidad).
Cálculos de la Teoría Funcional de la Densidad (DFT) para elucidar el mecanismo de reacción.

Principales resultados:

El catalizador Co-C-N exhibió una excelente actividad de HER con un bajo sobrepotencial de 212 mV a 100 mA cm ((-2).
El catalizador demostró una estabilidad superior a largo plazo en comparación con muchos catalizadores metálicos tradicionales.
Los cálculos de DFT revelaron que la coordinación híbrida C y N optimiza la distribución de carga y la transferencia de electrones.

Conclusiones:

El material de carbono Co-C-N desarrollado representa un prometedor catalizador abundante en la tierra para una evolución eficiente del hidrógeno.
El efecto sinérgico de la coordinación híbrida de C y N es clave para mejorar el rendimiento catalítico.
Este trabajo contribuye al avance de las tecnologías de escisión del agua para la conversión y el almacenamiento de energía renovable.

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