Visible light driven photocatalytic H2 generation property of trigonal ZnIn2S4 prepared by high temperature solid state reaction

For the first time, we prepared the trigonal ZnIn2S4 (in the space group R-3m) by typical solid state reaction at 700 degrees C in an evacuated quartz tube. It has a high crystallinity indicated by sharp reflection peaks in X-ray diffraction pattern, and its suitable band structure ensure the visible light driven photocatalytic H-2 generation in Na2S and Na2SO3 aqueous solution. The as-prepared ZnIn2S4 possesses a constant photocatalytic H-2 generation rate of similar to 32 mu mol/g/h after 5 cycles, which could be significantly enhanced to 1582 mu mol/g/h by co-loading 0.5 wt% Pt and 0.5 wt% Pd. By varying the incident beam intensity, the apparent quantum yield of photocatalytic water reduction was evaluated and optimized to 3.57(1)% at 405 nm. (C) 2019 Elsevier B.V. All rights reserved.