Journal
CHEMICAL ENGINEERING JOURNAL
Volume 430, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2021.132770
Keywords
Thermal solubility properties; Doped-ZIS; S-scheme heterojunction; DFT; HER
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Funding
- National Natural Science Foundation of China [21978106, 21878112]
- National Key Research and Development Program of China Plan [2018YFB1501701-1, 2018YFB1501503]
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A direct Step-scheme heterostructure of in-situ Mo doped ZnIn2S4 wrapped MoO3 (MoO3@Mo-ZIS) was prepared in this study, and it exhibited excellent photocatalytic activity. The enhanced H-2 evolution rate of the photocatalyst was attributed to the Mo doping and formation of Mo-S species. The direct S-scheme heterojunction of MoO3@Mo-ZIS promoted photogenerated carrier separation and improved the performance of photocatalytic hydrogen evolution reaction.
The construction of ZnIn2S4 based heterogeneous structure combined with in-situ relatively metal doping remains a great challenge. A direct Step-scheme (S-scheme) of in-situ Mo doped ZnIn2S4 wrapped MoO3 (MoO3@Mo-ZIS) was prepared in this work based on the thermal solubility properties of MoO3. The optimized photocatalyst of MoO3@Mo-ZIS exhibits superior H-2 evolution rate of 5.5 mmol/g/h without co-catalysts, which is the 6.5 and 1.3 times of ZIS and 40 Mo doped ZIS (40 Mo-ZIS), respectively. The excellent photocatalytic activity was attributed to the Mo doping and formation of Mo-S species. The density functional theory (DFT) calculations demonstrate that the Mo-S species would form a new hybridized state near the Fermi level, reducing the Delta GH* to enhance photocatalytic hydrogen evolution reaction (HER). Furthermore, the direct S-scheme heterojunction of MoO3@Mo-ZIS confirmed by Electron paramagnetic resonance (EPR) and Kelvin probe force microscopy (KPFM) promotes photogenerated carrier separation, thus enhancing the performance of photocatalytic HER.
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