Abstract
For the first time, we prepared the trigonal ZnIn2S4 (in the space group R-3m) by typical solid state reaction at 700 °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 H2 generation in Na2S and Na2SO3 aqueous solution. The as-prepared ZnIn2S4 possesses a constant photocatalytic H2 generation rate of ∼32 μmol/g/h after 5 cycles, which could be significantly enhanced to 1582 μmol/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.
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