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    The advanced photocatalytic performance of V doped CuWO4 for water splitting to produce hydrogen

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    Date
    2020-07-17
    Author
    Le Minh Tri, Nguyen
    Trung, Do Quang
    Van Thuan, Doan
    Dieu Cam, Nguyen Thi
    Al Tahtamouni, Talal
    Pham, Thanh Dong
    Duc, Dao Sy
    Thanh Tung, Mai Hung
    Van Ha, Hoang
    Anh Thu, Ngo Hong
    Trang, Hoang Thu
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    Abstract
    In the study, we successfully conducted vanadium doping to improve photocatalytic performance of the CuWO4 for water splitting to produce hydrogen. The doping mechanism, optimal doping ratio and material stability were investigated by various characterization methods and water splitting experiments. We found that the V substituted several W elements of the CuWO4 crystal. In the V–CuWO4, V dopant existed in form of the V5+, which created new energy level between the conduction band (CB) and the valence band (VB) of the CuWO4 to improve charge transfer as well as to prevent the e− and h+ recombination of the material. The substitution of W by V dopant also led the formation of Cu+ and W5+ in the CuWO4 crystal. The formation of Cu+ and W5+ in the CuWO4 crystal not only narrowed the energy band gap but also increased the CB potential of the material. Therefore, the V–CuWO4 generated significant amount of e− under visible light and the generated e− was strong enough to react with H+ to produce H2. The optimal V/W ratio for maximum improving photocatalytic performance of the CuWO4 was 6 wt%. Finally, we investigated that our prepared V–CuWO4 showed high stability during long-term water splitting process.
    URI
    https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85068888665&origin=inward
    DOI/handle
    http://dx.doi.org/10.1016/j.ijhydene.2019.06.132
    http://hdl.handle.net/10576/46752
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