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Mejora de la evolución fotocatalítica de H2 en CdS mediante la carga de MoS2 como cocatalizador bajo irradiación de

Xu Zong¹, Hongjian Yan, Guopeng Wu

¹State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China.

Journal of the American Chemical Society

|May 14, 2008

Resumen

La adición de una pequeña cantidad de disulfuro de molibdeno (MoS2) al sulfuro de cadmio (CdS) aumenta significativamente la producción de hidrógeno fotocatalítico (H2). Este catalizador MoS2 / CdS supera incluso a los catalizadores de metales nobles para la evolución de H2.

Área de la Ciencia:

Ciencia de los materiales Ciencia de los materiales.
La fotocatálisis por fotocatálisis.
Producción de hidrógeno Producción de hidrógeno.

Sus antecedentes:

La producción de hidrógeno fotocatalítico es un área clave para la energía renovable.
El sulfuro de cadmio (CdS) es un fotocatalizador conocido, pero a menudo requiere cocatalizadores para mejorar la eficiencia.

Objetivo del estudio:

Investigar el efecto de la carga de disulfuro de molibdeno (MoS2) como cocatalizador en CdS para mejorar la producción fotocatalítica de H2.
Para comparar el rendimiento de los catalizadores MoS2/CdS con CdS y CdS cargados con metales nobles.

Principales métodos:

Síntesis de fotocatalizadores compuestos de MoS2 / CdS.
Evaluación de las tasas de evolución de H2 a partir de la reformación del ácido láctico bajo irradiación de luz visible.
Comparación con catalizadores CdS y CdS modificados con metales nobles.

Principales resultados:

La carga de una pequeña cantidad (0,2 por ciento de peso) de MoS2 en CdS mejoró significativamente las tasas de producción de H2 hasta 36 veces.
El catalizador MoS2/CdS exhibió una mayor actividad que el CdS cargado con metales nobles (Pt, Ru, Rh, Pd, Au).
La irradiación de luz visible fue efectiva para la reacción fotocatalítica.

Conclusiones:

El compuesto MoS2/CdS es un fotocatalizador altamente eficiente para la producción de H2.
La mayor actividad se atribuye a la heterojunción formada entre MoS2 y CdS y las propiedades de activación H2 de MoS2.
El MoS2 es un cocatalizador prometedor para mejorar el rendimiento del fotocatalizador de semiconductores, reemplazando potencialmente a los costosos metales nobles.

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