WS2 sensitized mesoporous TiO2 for efficient photocatalytic hydrogen production from water under visible light irradiation |
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| Affiliation: | 1. The Institute of Scientific and Industrial Research (SANKEN), Osaka University, Mihogaoka 8-1, Ibaraki, Osaka 567-0047, Japan;2. School of Materials Science and Chemical Engineering, Ningbo University, Ningbo 315211, PR China;1. School of Chemistry and Chemical Engineering, Jiangsu University, Zhenjiang 212013, China;2. Institute for Energy Research, Jiangsu University, Zhenjiang 212013, China;1. School of Materials Science and Engineering, Ocean University of China, Qingdao 266100, PR China;2. National Supercomputer Research Center of Advanced Materials, Advanced Materials Institute, Qilu University of Technology(Shandong Academy of Sciences), Jinan 250014, PR China;3. Aramco Research Center-Boston, Aramco Services Company, Cambridge, MA 02139, USA;1. College of Physics, Hebei Key Laboratory of Photophysics Research and Application, Hebei Advanced Thin Films Laboratory, Hebei Normal University, Shijiazhuang 050024, China;2. School of Mechanical, Electrical & Information Engineering, Shandong University, Weihai 264209, China |
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| Abstract: | Nanosized WS2 sensitized mesoporous titanium dioxide (TiO2) was prepared to extend the adsorption of the wide band gap TiO2 into visible light region. Compared with TiO2 substrate without mesopores, it was found that the mesoporous substrate is beneficial for larger amount of WS2 loading and inhibition of the light-induced detachment of WS2 particles from the substrate during photocatalytic reaction, which leads to higher photocatalytic activity and better stability. We also found that the rate-determining step for photocatalytic hydrogen production is the transfer of electrons from TiO2 substrate to H+ in solution, when the recombination between electrons and holes within TiO2 could be neglected. In this case, deposition of Pt at the surface of semiconductor is indispensable for efficient hydrogen production. |
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