Interfacial Charge Transfer in MoS2/TiO2 Heterostructured Photocatalysts: The Impact of Crystal Facets and Defects
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Beijing Computational Science Research Center, Beijing 100193, China
2
Center for Green Innovation, School of Mathematics and Physics, University of Science & Technology Beijing, Beijing 100083, China
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Center for Water and Ecology, State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing 100084, China
4
Beijing Key Laboratory of Materials Utilization of Nonmetallic Minerals and Solid Wastes, National Laboratory of Mineral Materials, School of Materials Science and Technology, China University of Geosciences, Beijing 100083, China
*
Authors to whom correspondence should be addressed.
Academic Editor: Jonathan Albo
Molecules 2019, 24(9), 1769; https://doi.org/10.3390/molecules24091769
Received: 25 March 2019
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Revised: 22 April 2019
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Accepted: 23 April 2019
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Published: 7 May 2019
(This article belongs to the Special Issue Photo- and Photoelectro-Chemical Processes for Energy Applications)
One of the most challenging issues in photocatalytic hydrogen evolution is to efficiently separate photocharge carriers. Although MoS2 loading could effectively improve the photoactivity of TiO2, a fundamental understanding of the charge transfer process between TiO2 and MoS2 is still lacking. Herein, TiO2 photocatalysts with different exposed facets were used to construct MoS2/TiO2 heterostructures. XPS, ESR, together with PL measurements evidenced the Type II electron transfer from MoS2 to {001}-TiO2. Differently, electron-rich characteristic of {101}-faceted TiO2 were beneficial for the direct Z-scheme recombination of electrons in TiO2 with holes in MoS2. This synergetic effect between facet engineering and oxygen vacancies resulted in more than one order of magnitude enhanced hydrogen evolution rate. This finding revealed the elevating mechanism of constructing high-performance MoS2/TiO2 heterojunction based on facet and defect engineering.
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Keywords:
crystal facets; oxygen vacancy; molybdenum sulfide; titanium dioxide; photocatalysts; charge transfer
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MDPI and ACS Style
Wei, T.; Lau, W.M.; An, X.; Yu, X. Interfacial Charge Transfer in MoS2/TiO2 Heterostructured Photocatalysts: The Impact of Crystal Facets and Defects. Molecules 2019, 24, 1769. https://doi.org/10.3390/molecules24091769
AMA Style
Wei T, Lau WM, An X, Yu X. Interfacial Charge Transfer in MoS2/TiO2 Heterostructured Photocatalysts: The Impact of Crystal Facets and Defects. Molecules. 2019; 24(9):1769. https://doi.org/10.3390/molecules24091769
Chicago/Turabian StyleWei, Tingcha, Woon M. Lau, Xiaoqiang An, and Xuelian Yu. 2019. "Interfacial Charge Transfer in MoS2/TiO2 Heterostructured Photocatalysts: The Impact of Crystal Facets and Defects" Molecules 24, no. 9: 1769. https://doi.org/10.3390/molecules24091769
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