Journal
NANO ENERGY
Volume 39, Issue -, Pages 513-523Publisher
ELSEVIER
DOI: 10.1016/j.nanoen.2017.07.030
Keywords
Quantum dots; ZnS/CdIn2S4/rGO; Nanosheet arrays; Charge separation; Photocatalytic hydrogen evolution
Categories
Funding
- National Natural Science Foundation of China (NSFC) [21303130]
- Natural Science Basic Research Plan in Shaanxi Province of China [2017JZ001]
- State Key Laboratory of Heavy Oil Processing [SKLOP201602001]
- Fundamental Research Funds for the Central Universities
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In this paper, we report a vertical self-assembly of ultrathin CdIn2S4 nanosheet arrays on the conductive substrate of the reduced graphene oxide (rGO) by the facile hydrothermal process, during which ZnS quantum dots (QDs) were in-situ deposited on the gap of CdIn2S4 nanosheet arrays to form the intimate interfacial contact between ZnS/CdIn2S4 and rGO. The unique structural configuration of this well-ordered three-dimensional (3D) ZnS/CdIn2S4/rGO nanosheet arrays were very beneficial for the visible-light absorption, thus strongly improving the light-harvesting. Moreover, the as-prepared 3D nanosheet arrays architecture with the GO content of 13 wt% exhibited the highest photocurrent transient response (107.4 mu A cm(-2)), which corresponding to the highest hydrogen generation of 6.82 mmol g(-1) h(-1) and a relatively high apparent quantum efficiency of 19.34% under visible light irradiation. The enhanced photocatalytic hydrogen production activities can be attribute to the synergistic effects of the favorable light trapping ability, more exposed activity sites and efficient spatial charge separation as well as faster electron transfer between ZnS QDs and CdIn2S4 nanosheet arrays through the conductive network of rGO. This work presents a new strategy to reasonably design and fabricate the next generation ultrathin nanosheet arrays architecture for practical applications in efficient photocatalytic water splitting.
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