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Acoplamiento de catalizadores híbridos de un solo átomo de Ni y Cu a nanoescala para la electrorreducción eficiente

Zhouyang Yin¹, Jiaqi Yu², Zhenhua Xie³

¹Department of Chemistry, University of Virginia, Charlottesville, Virginia 22904, United States.

Journal of the American Chemical Society

|November 16, 2022

Resumen

Un nuevo catalizador híbrido con níquel monoatómico y cobre a nanoescala aumenta la producción de etileno a partir de la reducción de CO2. Esta innovación mejora significativamente la eficiencia del acoplamiento carbono-carbono para soluciones de energía más limpias.

Área de la Ciencia:

La electroquímica
Catálisis
Ciencias de los materiales

Sus antecedentes:

La reacción electrocatalítica de reducción de CO2 (eCO2RR) es crucial para convertir el CO2 en productos valiosos.
La mejora de la selectividad y la eficiencia en el acoplamiento C-C para la producción de etileno (C2H4) sigue siendo un reto.

Objetivo del estudio:

Desarrollar un catalizador híbrido que integre un solo átomo de Ni y Cu a nanoescala para mejorar la eCO2RR.
Mejorar el acoplamiento C-C y la eficiencia de la producción de etileno.

Principales métodos:

Fabricación de un catalizador híbrido con un solo átomo de Ni en nanocables ordenados de carbono mesoporoso y Cu (NW).
Espectroscopia de absorción de infrarrojos mejorada in situ (SEIRAS) para el estudio del enriquecimiento de CO.
Estructura de absorción de rayos X cerca del borde in situ (XANES) para evaluar la estabilidad estructural.
Evaluación del rendimiento electroquímico en una célula de flujo alcalino.

Principales resultados:

El catalizador híbrido demostró una conversión selectiva de CO2 a CO de alta velocidad por un solo átomo de Ni.
La incorporación de Ni ha mejorado significativamente el enriquecimiento de CO en Cu NW para el acoplamiento C-C.
El catalizador optimizado logró una eficiencia Faradaic del 66% para la producción de C2H4 a 100 mA·cm-2.
Se observó una mejora de cinco órdenes en la selectividad de C2H4 en comparación con Cu NWs solo.

Conclusiones:

El catalizador híbrido integra efectivamente el Ni monoatómico y el Cu a nanoescala para un rendimiento eCO2RR superior.
Este enfoque ofrece una estrategia prometedora para la producción eficiente de etileno a partir de CO2.
El catalizador exhibe estabilidad estructural, lo que lo hace adecuado para aplicaciones prácticas.

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