期刊
JOURNAL OF PHYSICAL CHEMISTRY C
卷 125, 期 23, 页码 12672-12681出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.jpcc.1c02991
关键词
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资金
- National Key Research and Development Program of China [2016YFA0200602, 2018YFA0208603, 2017YFA0303500, 2018YFA0208702]
- National Natural Science Foundation of China [22025304, 22033007, 21790350, 21573211, 21633007, 21803067, 91950207, U2004214]
- DNL Cooperation Fund of Chinese Academy of Sciences [DNL201913]
- Anhui Initiative in Quantum Information Technologies [AHY090200]
- USTC-NSRL Joint Funds
- USTC Center for Micro-and Nanoscale Research and Fabrication
- Steady High Magnetic Field Facilities
- High Magnetic Field Laboratory
- Fundamental Research Funds for Central Universities of China
This study demonstrates the potential of hydrogenated MoO3 (HMO) as an excellent cocatalyst for the ZnIn2S4 photocatalyst, significantly improving the H-2 production rate. The efficient charge transfer from ZnIn2S4 to HMO and the lowered overpotential of the H-2 evolution reaction contribute to this enhancement.
The frequent use of noble metals such as Pt as a cocatalyst to improve photocatalytic performance has stimulated an extensive search for cost-effective materials as alternative cocatalysts. Here we report the use of hydrogenated MoO3 (HMO) with a unique quasi-metallic property as an excellent cocatalyst for the ZnIn2S4 photocatalyst. The HMO-ZnIn2S4 composite with an optimized ratio realizes a H-2 production rate of 1564 mu mol h(-1) g(-1) under visible light (lambda >= 420 nm) excitation. It not only significantly surpasses the performance of pristine ZnIn2S4 (327 mu mol h(-1) g(-1)), but also outperforms the 1 wt % Pt-decorated ZnIn2S4 (1308 mu mol h(-1) g(-1)). The reasons for this improvement, as disclosed by photoelectrochemical characterization, ultrafast laser spectroscopy, and density functional calculation, is that the efficient charge transfer from ZnIn2S4 to HMO facilitates electron-hole separation after photoexcitaiton, and HMO substantially lowers the overpotential of the H-2 evolution reaction. This work thus demonstrates the potential of quasi-metallic hydrogenated metal oxide as an alternative to noble metal cocatalyst for photocatalytic application.
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