Citation: Lun Pan, Jingwen Zhang, Xu Jia, Yu-Hang Ma, Xiangwen Zhang, Li Wang, Ji-Jun Zou. Highly efficient Z-scheme WO_3-x quantum dots/TiO₂ for photocatalytic hydrogen generation[J]. Chinese Journal of Catalysis, ;2017, 38(2): 253-259. doi: 10.1016/S1872-2067(16)62576-7 shu

Highly efficient Z-scheme WO_3-x quantum dots/TiO₂ for photocatalytic hydrogen generation

Lun Pan ^a,b, ,
Jingwen Zhang ^a,b ,
Xu Jia ^a,b ,
Yu-Hang Ma ^a ,
Xiangwen Zhang ^a,b ,
Li Wang ^a,b ,
Ji-Jun Zou ^a,b

a Key Laboratory for Green Chemical Technology of Ministry of Education, School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China;
b Collaborative Innovative Center of Chemical Science and Engineering(Tianjin), Tianjin 300072, China

Received Date: 28 August 2016
Revised Date: 15 October 2016

Fund Project: This work was supported by the National Natural Science Foundation of China (21506156, 21676193) and the Tianjin Municipal Natural Science Foundation (15JCZDJC37300, 16JCQNJC05200).

Z-scheme semiconductors are a promising class of photocatalysts for hydrogen generation. In this work, Z-scheme semiconductors composed of WO_3-x quantum dots supported on TiO₂ (WO_3-x QDs/TiO₂) were fabricated by solvothermal and hydrogen-reduction methods. Characterization by transmission electron microscopy and X-ray diffraction indicated that the amount and size of the WO_3-x QDs could be tuned by modulating the addition of the W precursor. Evidence from X-ray photoelectron spectroscopy and photoluminescence spectroscopy suggested that the hydrogen reduction of the composite induced the formation of oxygen vacancy (W⁵⁺/VO) defects in WO₃. These defects led to ohmic contact between WO_3-x and TiO₂, which altered the charge-transfer pathway from type II heterojunction to Z-scheme, and maintained the highly reductive and oxidative ability of TiO₂ and WO_3-x, respectively. Therefore, the Z-scheme sample showed 1.3-fold higher photoactivity than pure TiO₂ in hydrogen generation. These results suggest that the formation of W⁵⁺/VO defects at the interface is highly beneficial for the fabrication of Z-scheme photocatalysts.
- WO_3-x,
- Titanium oxide,
- Hydrogen generation,
- Quantum dots,
- W⁵⁺/oxygen vacancy defect
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Highly efficient Z-scheme WO_3-x quantum dots/TiO₂ for photocatalytic hydrogen generation