Abstract
Ni2+ doped ZnIn2S4 microsphere with flower-like nanoscale petals were prepared by a hydrothermal method. There was an optimal Ni doping content of 0.3 wt% where hydrogen production reached the maximum. Higher Ni2+ doping can hardly dope into the ZnIn2S4 lattice and just stay at ZnIn2S4 surface, leading to decreased activity. It was determined that Ni2+ entering the ZnIn2S4 lattice instead of surface NiS dominated the enhanced photocatalytic activity. The experimental results were rationalized by assuming Ni2+ serving as shallow trapping sites, greatly enhancing the activity of the photocatalyst.
Graphical Abstract
Ni2+ doped ZnIn2S4 microsphere with flower-like nanoscale petals were prepared by a hydrothermal method. There is an optimal Ni doping content of 0.3 wt% where hydrogen production reached the maximum. It is assumed that Ni2+ serving as shallow trapping sites can separate the arrival time of e−/h+ pairs at the petal surface of ZnIn2S4, so as to greatly reduce their surface recombination and which, in turn, leads to improved hydrogen production.
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The authors gratefully acknowledge the financial supports from the National Natural Science Foundation of China (No. 50821604, 20906074) and National Basic Research Program of China (No. 2009CB220000).
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Jing, D., Liu, M. & Guo, L. Enhanced Hydrogen Production from Water over Ni Doped ZnIn2S4 Microsphere Photocatalysts. Catal Lett 140, 167–171 (2010). https://doi.org/10.1007/s10562-010-0442-9
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DOI: https://doi.org/10.1007/s10562-010-0442-9