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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Bibliographic Details
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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Summary: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.
ISSN:1673-1905
1993-5013
DOI:10.1007/s11801-019-8162-x