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Políedro hueco de nanotubos de carbono con núcleo ZIF-8@ZIF-67 derivado de nanopartículas de CoP integradas para una
Yuan Pan1,2, Kaian Sun2, Shoujie Liu1,3
1Department of Chemistry, Tsinghua University , Beijing 100084, China.
Journal of the American Chemical Society
|January 18, 2018
Resumen
Los investigadores desarrollaron un nuevo catalizador de nanopartículas de fosfuro de cobalto (CoP NP) dentro de un poliedro hueco de nanotubo de carbono dopado con nitrógeno (NCNHP) para una división general eficiente del agua. Este catalizador híbrido demuestra una actividad y estabilidad excepcionales para las reacciones de evolución de hidrógeno y oxígeno.
Área de la Ciencia:
- Ciencias de los materiales
- La electroquímica
- Catálisis
Sus antecedentes:
- El desarrollo de electrocatalizadores eficientes de metales no nobles para la división general del agua es crucial para la producción sostenible de hidrógeno.
- Los catalizadores existentes a menudo sufren de baja actividad, poca estabilidad o alto costo.
Objetivo del estudio:
- Para sintetizar y caracterizar una nueva nanoestructura híbrida para mejorar la división electrocatalítica del agua.
- Investigar los efectos sinérgicos entre las nanopartículas de fosfuro de cobalto y los poliedros huecos de nanotubos de carbono dopados con nitrógeno.
Principales métodos:
- Se empleó una estrategia de pirólisis-oxidación-fosfidación utilizando el núcleo ZIF-8@ZIF-67 como precursor.
- Se caracterizaron las nanopartículas CoP (NP) resultantes incrustadas en el poliedro hueco de nanotubos de carbono N-dopado (NCNHP).
- Se evaluó el rendimiento electrocatalítico para la división general del agua, incluida la actividad y la estabilidad a largo plazo.
- Se realizaron cálculos de la teoría funcional de la densidad (DFT) para comprender el mecanismo catalítico.
Principales resultados:
- El híbrido CoP/NCNHP exhibió un rendimiento electrocatalítico bifuncional sobresaliente para la división general del agua.
- Se requería un potencial bajo de 1,64 V para lograr una densidad de corriente de 10 mA·cm-2.
- El catalizador demostró una actividad y estabilidad superiores durante más de 36 horas con un potencial de descomposición insignificante.
- Los cálculos de DFT revelaron estados electrónicos mejorados y fuerza de unión debido a la transferencia de electrones de NCNHP a CoP.
Conclusiones:
- La nanoestructura híbrida CoP/NCNHP sirve como un electrocatalizador de metales no nobles altamente activo y estable para la división general del agua.
- El efecto sinérgico entre CoP NP y NCNHP, junto con las propiedades electrónicas mejoradas, contribuye a mejorar el rendimiento catalítico y la estabilidad.
- Este trabajo ofrece una estrategia prometedora para el diseño de electrocatalizadores avanzados para aplicaciones de energía limpia.
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