摘要
Metal nanoparticles (NPs)@MoS2core-shell nanostructures as plasmon-enhanced photocatalysts have been studied recently for efficiently photocatalytic water splitting. However, there is few reports about the effect of coverage of MoS2on the photocatalytic water splitting. Here, we systematically study the effect of the MoS2coverage on the photocatalytic water splitting in the Au NPs@MoS2core-shell hybrid structures. The different MoS2coverage on the Au NPs can be obtained through tuning the hydrothermal reaction time from 3 h to 18 h. We find that the moderate MoS2coverage (i.e. 12 h) can ensure the H2O molecules penetrating the MoS2shell and reaching to the Au-MoS2junctions. In addition, the moderate MoS2coverage is beneficial for the incident light to excite the strong plasmonic effect around the Au NPs core. The most efficient separation efficiency of electron–hole pairs in the Au NPs@MoS2core-shell structure with the moderate MoS2coverage is also possible reason for the high performance photocatalytic water splitting. As a result, the moderate MoS2coverage shows the largest yield of hydrogen gas production (2110.7 μmol) among the Au NPs@MoS2core-shell structures. In addition, the yield of hydrogen gas production is also obvious higher than that of the pure MoS2spheres (880.0 μmol/g) and simple mixture of Au NPs and MoS2sphere (1380.3 μmol/g). Our study strengthens the significance of the moderate MoS2coverage in the Au NPs@MoS2core-shell structures for high-performance photocatalytic water splitting.
源语言 | 英语 |
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页(从-至) | 82-88 |
页数 | 7 |
期刊 | Journal of Alloys and Compounds |
卷 | 706 |
DOI | |
出版状态 | 已出版 - 2017 |