Polyoxo-titanium clusters dually functionalized ZnIn_2S_4/MIL-101 catalyst for photocatalysis of aquatic hydrogen production

摘要

Herein, we have extended a reasonable strategy to design and prepare a series of photo-catalysts ZIS/MIL-101/PTCs (ZIS = ZnIn2S4, MIL = Materials of Institute Lavoisier, PTCs = Polyoxo-titanium clusters) with evidently enhanced photocatalytic activity for H-2 evolution. The synthesis of all photocatalysts was carried out by traditional step-by-step in situ reaction method without special treatment. As expected, the photocatalytic H-2 production rates by the three PTCs hybrid catalysts (ZIS/MIL-101/PTCs), namely ZIS/MIL-101/PTC-3, ZIS/MIL-101/PTC-7 and ZIS/MIL-101/PTC-9, were approximately 4, 7 and 12 times higher than that of ZIS/MIL-101, respectively. The results of UV-Vis diffuse reflectance spectroscopy and photoelectric responses show the reasons for boosting photocatalytic activity are that introduction of PTCs can well match energy gap and accelerate the photogenerated charge carriers transfer. This dual functionalization of PTCs can also be further confirmed by the photocatalytic activities of three La-ZIS/MIL-101/PTCs (La-ZIS/MIL-101/PTC-3, La-ZIS/MIL-101/PTC-7 and La-ZIS/MIL-101/PTC-9) photocatalysts doped with the La element. (C) 2020 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.