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Ag@MoS₂ Heteroestructura del núcleo como plataforma SERS para revelar los sitios activos de la evolución del

Junze Chen¹, Guigao Liu¹, Yue-Zhou Zhu²

¹Center for Programmable Materials, School of Materials Science and Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798, Singapore.

Journal of the American Chemical Society

|March 26, 2020

Resumen

Los investigadores identificaron el sitio activo para la reacción electroquímica de evolución del hidrógeno (HER) en los catalizadores de disulfuro de molibdeno (MoS2). La espectroscopia de Raman mejorada in situ (SERS) reveló que los átomos de azufre en MoS2 son clave para la catálisis de HER.

Área de la Ciencia:

Ciencias de los materiales
Catálisis
La electroquímica

Sus antecedentes:

Comprender los mecanismos de reacción catalítica es crucial para el diseño de catalizadores eficientes.
El disulfuro de molibdeno (MoS2) es un catalizador prometedor para la reacción electroquímica de evolución del hidrógeno (HER), pero su mecanismo a nivel atómico sigue sin estar claro.

Objetivo del estudio:

Para aclarar el mecanismo a nivel atómico de la HER electroquímica catalizada por MoS2.
Desarrollar un método para la investigación in situ de procesos catalíticos a nivel atómico.

Principales métodos:

Las heteroestructuras de núcleo-caparazón (Ag@MoS2) de una sola capa de plata (Ag) recubierta con MoS2, sintetizadas mediante un método químico húmedo.
Utilizó las heteroestructuras de Ag@MoS2 como plataformas para la espectroscopia de Raman mejorada en superficie in situ (SERS) debido al núcleo de Ag plasmónico.

Principales resultados:

In situ SERS proporcionó evidencia espectroscópica en tiempo real de la formación de enlaces S-H en la superficie de MoS2 durante HER.
Se confirmó que los átomos de azufre (S) en la superficie de MoS2 actúan como los sitios activos para la HER electroquímica.

Conclusiones:

El estudio revela el sitio activo catalítico para el HER electroquímico en MoS2 a nivel atómico.
Demuestra la utilidad de los SERS in situ en las heteroestructuras plasmónicas para estudios mecanicistas de la catálisis.

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