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Improved photoelectrochemical performance by forming a ZnO/ZnS core/shell nanorod array

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 act...

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Published in:	Optoelectronics letters 2019-07, Vol.15 (4), p.241-244
Main Authors:	Sui, Mei-rong, Gu, Xiu-quan, Shi, Mei-lin, Wang, Yong, Liu, Lin-lin
Format:	Article
Language:	English
Subjects:	Arrays Charge efficiency Charge transfer Core-shell structure Current carriers Hydrothermal treatment Lasers Nanorods Optical Devices Optics Photonics Physics Physics and Astronomy Shells Thin films Thin walled shells Zinc oxide Zinc sulfide
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creator	Sui, Mei-rong Gu, Xiu-quan Shi, Mei-lin Wang, Yong Liu, Lin-lin
description	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.
doi_str_mv	10.1007/s11801-019-8162-x
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subjects	Arrays Charge efficiency Charge transfer Core-shell structure Current carriers Hydrothermal treatment Lasers Nanorods Optical Devices Optics Photonics Physics Physics and Astronomy Shells Thin films Thin walled shells Zinc oxide Zinc sulfide
title	Improved photoelectrochemical performance by forming a ZnO/ZnS core/shell nanorod array
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