Journal
RARE METALS
Volume 41, Issue 11, Pages 3795-3802Publisher
NONFERROUS METALS SOC CHINA
DOI: 10.1007/s12598-022-02014-0
Keywords
BiVO4; Water splitting; Charge extraction; Oxygen evolution catalyst; Graphene oxide
Funding
- National Natural Science Foundation of China [22172077]
- Natural Science Foundation of Jiangsu Province of China [BK20211573]
- Jiangsu International Science and Technology Cooperation Program [BZ2020063]
- Fundamental Research Funds for the Central Universities [30921011216]
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This study reports a graphene oxide (GO) layer that promotes charge transfer from BiVO4 to NiOOH catalyst and improves stability. The rationally designed photoanode achieves high photocurrent density at 1.23 V, providing a low-cost auxiliary material for enhancing photoelectrochemical water splitting.
The tailor-made oxygen evolution catalysts (OECs) paired with photoanodes offer a path to promote water oxidation kinetics; however, the unsatisfied interface between OECs and photoanode sets a barrier for efficient charge transfer. Herein, a graphene oxide (GO) layer to promote the charge transfer from BiVO4 (BVO) to NiOOH OEC is reported. It is found that GO layer inserted between BVO and NiOOH can not only serve as hole extraction layer due to its hole storage capability, but also improve the stability. Finally, the rationally designed NiOOH/GO/BVO photoanode achieves a photocurrent density of 3.81 mA center dot cm(-2) at 1.23 V (vs. reversible hydrogen electrode (RHE)), which is 3.85 times as high as that of bare BVO. This work opens up low-cost auxiliary materials for enhancing photoelectrochemical water splitting.
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