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Trampas de vacío de carbono único de platino atómico para la catálisis de la evolución del hidrógeno

Qin Yang^1,2, Hanxuan Liu³, Pei Yuan¹

¹College of Chemical Engineering, Fuzhou University, Fuzhou 350002, P.R. China.

Journal of the American Chemical Society

|January 7, 2022

Resumen

Los investigadores crearon una configuración atómica única de platino (Pt-C3) dentro del grafeno defectuoso, aumentando significativamente la actividad de la reacción de evolución del hidrógeno (HER). Este avance ofrece una alternativa prometedora a los catalizadores de platino convencionales para aplicaciones de HER.

Área de la Ciencia:

Ciencias de los materiales
La electroquímica
Catálisis

Sus antecedentes:

El platino atómico (Pt) es reconocido por su alta actividad intrínseca en la reacción de evolución del hidrógeno (HER).
La optimización del entorno de coordinación de Pt es crucial para mejorar el rendimiento catalítico.

Objetivo del estudio:

Para sintetizar y caracterizar una nueva configuración Pt-C3 en una matriz de carbono defectuosa.
Evaluar la actividad HER de la configuración Pt-C3 en medios ácidos y alcalinos.
Para aclarar el mecanismo subyacente para el rendimiento HER mejorado.

Principales métodos:

Síntesis de las vacantes individuales en una matriz de carbono (grafeno defectuoso).
Atrapar Pt atómico dentro de las vacantes para formar la configuración Pt-C3.
Evaluación electroquímica de la actividad HER, incluidas las mediciones de la frecuencia de rotación (TOF) y la actividad de la masa.

Principales resultados:

La configuración Pt-C3 exhibió una reactividad excepcionalmente alta para HER tanto en soluciones ácidas como alcalinas.
La actividad intrínseca (TOF) y la actividad de masa fueron aproximadamente 18 veces más altas que el 20 por ciento Pt/C comercial.
El sitio Pt-C3 demostró una mayor capacidad de captura de electrones y una menor diferencia de energía libre de Gibbs (ΔG).

Conclusiones:

La coordinación Pt-C3 optimizada en una matriz de carbono defectuosa proporciona un rendimiento HER superior.
La mayor actividad se atribuye a la mejora de la reducción de H+ y la aceleración de la desorción de H2.
Este estudio ofrece nuevos conocimientos sobre el diseño de catalizadores Pt atómicos altamente activos y dispersos para HER.

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