期刊
RENEWABLE ENERGY
卷 148, 期 -, 页码 380-387出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.renene.2019.10.044
关键词
Photoelectrochemical water splitting; Bismuth vanadate; Cuprous oxide; n-n heterojunctions; Graphene
资金
- National Key R&D Program of China [2016YFB0301600]
- National Natural Science Foundation of China [21627813, 51772015]
- Guangxi Natural Science Foundation [2017GXNSFAA198289, 2018GXNSFAA294001]
- Chongzuo Science Foundation [FA2017004FA2017003, FA2018002]
The BiVO4 was firstly prepared by modification's metal organic decomposition method followed by electrodepositing rGO and Cu2O on BiVO4 to construct the rGO decorated BiVO4/Cu2O n-n heterojunction triadic photoanode for photoelectrochemical (PEC) water splitting. The structure and PEC properties of the photoanode were characterized and measured by various spectral analysis and three electrode system. The highest photocurrent density of the triadic photoanode achieves 2.2 mA/cm(2) at 1.8 V (vs. RHE) that is closely 2 folds of single BiVO4 photoanode. The photoanode has the highest IPCE value of 42.0% at 400 nm. The enhanced PEC properties come from the valid separation of the photogenerated electron-hole pair and enhancement of surface oxidation kinetics due to the formation of n-n heterojunction and rGO act as the role of electronic migration mediator accelerates charge carrier transfer, which has been demonstrated by calculated the decrease of charge transfer resistance at electrode/electrolyte interface and prolonging of charge carriers lifetimes. (C) 2019 Elsevier Ltd. All rights reserved.
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