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.
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