Chinese Journal of Catalysis ›› 2018, Vol. 39 ›› Issue (3): 472-478.DOI: 10.1016/S1872-2067(17)62961-9

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Zinc-doped g-C3N4/BiVO4 as a Z-scheme photocatalyst system for water splitting under visible light

Zhen Qin, Wenjian Fang, Junying Liu, Zhidong Wei, Zhi Jiang, Wenfeng Shangguan   

  1. Research Center for Combustion and Environmental Technology, School of Mechanical Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
  • Received:2017-09-28 Revised:2017-10-29 Online:2018-03-18 Published:2018-03-10
  • Contact: 10.1016/S1872-2067(17)62961-9
  • Supported by:

    This work was supported by the National Natural Science Foundation of China (21773153).

Abstract:

A two-step photocatalytic water splitting system, termed a "Z-scheme system", was achieved using Zn-doped g-C3N4 for H2 evolution and BiVO4 for O2 evolution with Fe2+/Fe3+ as a shuttle redox mediator. H2 and O2 were evaluated simultaneously when the doping amount of zinc was 10%. Moreover, Zn-doped (10%) g-C3N4 synthesized by an impregnation method showed superior active ability to form the Z-scheme with BiVO4 than by in-situ synthesis. X-ray diffraction, UV-Vis spectroscopy, scanning electron microscopy, and X-ray photoelectron spectroscopy were used to characterize the samples. It was determined that more Zn-N bonds could be formed on the surface of g-C3N4 by impregnation, which could facilitate charge transfer.

Key words: g-C3N4, BiVO4, Z-scheme, Shuttle redox mediator, Water splitting