期刊
ELECTROCHIMICA ACTA
卷 337, 期 -, 页码 -出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2020.135763
关键词
Heterojunction photoanode; Visible light; PEC water splitting; p-n junction; Type II band alignment
资金
- National Natural Science Foundation of China [61575225, 11074312, 11374377, 11474174, 11404414]
- Undergraduate Research Training Program of Minzu University of China [URTP2019110017]
In this study, a novel three-dimensional (3D) CdS@NKOH)(2) nanorod array (NRA) photoanode with a type-II band alignment and a p-n junction has been designed and constructed via a simple electrochemical deposition of hierarchical beta-Ni(OH)(2) nanosheets onto the surfaces of the CdS NRAs. The 3D CdS@Ni(OH)(2) NRA photoanode fabricated under the optimal deposition current exhibits remarkably improved photoelectrochemical water splitting performance, and obtains a photocurrent density of up to 1.1 mA/cm(2), 5-fold that of the pure CdS NRA photoanode. Most importantly, the solar-to-hydrogen conversion efficiency of the 3D CdS@Ni(OH)(2) NRA photoanode is 3.3-fold higher than that of the pure CdS NRA photoanode at 0.67 V vs. RHE. The electrochemical and photoluminescence emission measurements confirm that the enhanced PEC water splitting capability of the prepared 3D CdS@NKOH)(2) NRA photoanode is attributed to the efficient charge separation, which is achieved by the synergistic action of the type-II energy alignment and the p-n junction. (C) 2020 Elsevier Ltd. All rights reserved.
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