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Separación de agua impulsada por luz roja por Au (núcleo) -CdS (concha) Nanohuevo de medio corte con unión

Shin-Ichi Naya¹, Takahiro Kume², Ryo Akashi²

¹Environmental Research Laboratory, Kindai University , 3-4-1, Kowakae, Higashi-Osaka, Osaka 577-8502, Japan.

Journal of the American Chemical Society

|January 11, 2018

Resumen

Los investigadores desarrollaron un nuevo fotocatalizador de huevo de oro y sulfuro de cadmio (HC-Au@CdS). Este material logra una división eficiente del agua bajo luz roja, demostrando un alto rendimiento cuántico externo para la fotosíntesis artificial.

Área de la Ciencia:

Ciencias de los materiales
Fotocatálisis
Fotosíntesis artificial

Sus antecedentes:

Los fotocatalizadores heteronanostructurados (HNS) son cruciales para la fotosíntesis artificial y la división del agua.
La eficiencia fotocatalítica está influenciada por la geometría del material, las dimensiones y la calidad de la unión.

Objetivo del estudio:

Para introducir un nuevo fotocatalizador plasmónico HNS, el nanohuevo Au ((core) -CdS ((shell) cortado a la mitad (HC-Au@CdS).
Para investigar su aplicación en la división del agua.

Principales métodos:

Fabricación de ZnO (Au/ZnO) cargado con nanopartículas Au (NP) mediante irradiación con luz UV.
Deposición selectiva de CdS hexagonal en las superficies Au con una relación epitaxial (EPI).
Disolución selectiva del soporte de ZnO para obtener HC-Au@CdS.
La división del agua bajo la irradiación de luz roja (λex = 640 nm).

Principales resultados:

Síntesis exitosa de nanohuevos HC-Au@CdS que mantienen el tamaño de Au NP y las uniones EPI.
Se ha logrado la división estequiométrica continua del agua bajo la irradiación de luz roja.
Obtuvo un rendimiento cuántico externo sin precedentes del 0,24%.

Conclusiones:

Los nanohuevos HC-Au@CdS representan una nueva clase prometedora de fotocatalizadores plasmónicos HNS.
El material desarrollado demuestra una alta eficiencia para la división del agua, avanzando en la investigación de la fotosíntesis artificial.

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