期刊
NANOSCALE
卷 5, 期 22, 页码 11291-11297出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c3nr03969b
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资金
- 973 Program of Ministry of Science and Technology of China [2012CB934103]
- 100-Talents Program of the Chinese Academy of Sciences [Y1172911ZX]
A novel ZnO/reduced graphene oxide (RGO)/CdS heterostructure was successfully synthesized via a facile three-step solution method. RGO serves as an interlayer between ZnO nanowires and CdS quantum dots (QDs), which provides a high speed charge transfer channel, leading to an enhanced charge separation efficiency. Under UV light irradiation, the photocatalytic activity of the ZnO/RGO/CdS heterostructure is 4.0 times and 1.9 times as high as those of pure ZnO and ZnO/RGO, respectively. Under visible light irradiation, the ZnO/RGO/CdS heterostructure shows a dramatic visible light photocatalytic activity which is 2.3 times higher than that of the ZnO/CdS photocatalyst. The photocurrent of the ZnO/RGO/CdS heterostructure under UV light irradiation was greatly enhanced and a photocurrent under visible light irradiation was observed. The enhanced photocatalytic activity and the extended light adsorption spectrum originate from the type-II ZnO/CdS band alignment and the introduction of RGO as a charge mediator. Our results might open up a promising way to develop novel and highly efficient RGO-based heterostructure photocatalysts.
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