Abstract
In this work, a series of WS2/ZnIn2S4 composite photocatalysts containing different WS2 cocatalyst amounts were prepared through a facile hydrothermal approach. The prepared WS2/ZnIn2S4 composite photocatalysts were characterized by means of X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and UV–vis diffuse reflectance spectra (DRS), and their visible-light driven photocatalytic hydrogen evolution performances were also investigated. It was revealed that the loading of WS2 cocatalyst could greatly boost the photocatalytic hydrogen evolution activity of ZnIn2S4, and the 3% WS2/ZnIn2S4 sample achieved the highest hydrogen production rate of 199.1 μmol/h/g, which was nearly 6 times higher than ZnIn2S4 and was even comparable to the conventional Pt/ZnIn2S4 photocatalyst. The improved photocatalytic performance of WS2/ZnIn2S4 could be ascribed to the promotion of separation and migration of photogenerated charge carriers derived from the heterostructure formed at the interface between ZnIn2S4 and WS2. Thus, this work proves a great potential of WS2 as a cost-effective cocatalyst for semiconductor-based photocatalytic hydrogen production.
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