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《Optoelectronics Letters》 2019年04期
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Improved photoelectrochemical performance by forming a ZnO/ZnS core/shell nanorod array

隋美蓉  顾修全  时梅林  王永  刘琳琳  
【摘要】:ZnO nanorod arrays(NRAs) were prepared via a facile hydrothermal method for photoelectrochemical(PEC) applications.Then, ZnS thin shell layers were deposited onto them via a facile hydrothermal treatment process for constructing a ZnO/ZnS core/shell structure. It was demonstrated that the PEC activity of a ZnO NRA is enhanced significantly after the surface modification, although there weren't any obvious changes in the visible-light harvesting efficiency.Both the Nyquist and Mott-Schottky(M-S) plots were employed to reveal the reason, which was attributed to higher electrocatalytic activity of ZnS than that of ZnO and the resulting higher charge transfer efficiency across the solid/liquid interfaces. Finally, a schematic band model was proposed for clarifying the charge carrier transfer mechanism occurred at the interfaces.

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