Abstract
Zn(O,S)-based materials have been studied for the last few years but only could be driven under ultraviolet (UV) light due to its high bandgap energy. Herein, we transform Zn(O,S) from UV to a visible-light-driven catalyst. (Zn,In)(O,S) material system at different In contents was prepared by adding indium precursor into the hydrothermal process. With increasing the In content from 0%, 10%, 50%, 67%, and 100% the Zn(O,S), (Zn,In)(O,S) solid solution, (Zn,In)(O,S)/In(OH)3 composite, ZnIn2(O,S)4, and In2(O,S)3 appeared in sequence. (Zn,In)(O,S) prepared with 50 mol% indium precursor was a ZI-50 composite powder and showed the optimum hydrogen evolution reaction (HER) rate under visible light illumination. A kinetic mechanism for enhancing photocatalytic hydrogen evolution based upon heterojunction was proposed and explained.
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