Composite structures for enhanced photoelectrochemical activity: WS2 quantum dots with oriented WO3 arrays
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Novel visible-light-driven WO3 nanorod arrays with oriented (200) facet were successfully synthesized via a facile solvothermal process using mixed ethanol and water as solvents. Subsequently, WS2 quantum dots (QDs) derived from bulk WS2 powder via ultrasonication were interspersed on WO3 nanorod arrays. The presence of suitable volume ratio of ethanol is a key factor to achieve greater exposure of the WO3 (200) facet. The morphologies, microstructures and optical properties of the prepared samples were systematically explored. The results illustrated that the preferential exposure on the (200) facet of WO3 nanorods as well as the efficient relative electrochemically active surface areas provided by WS2 QDs could facilitate the charge transfer between WS2 QDs and the (200) facet of WO3 nanorods. This study provides a promising approach to design high performance photoanodes for photoelectrochemical water splitting.
This work was financially supported by National Natural Science Foundation of China (21773074) and Guangdong Natural Science Foundation (2014A030311039).
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