Au nanoparticles@MoS2 core-shell structures with moderate MoS2 coverage for efficient photocatalytic water splitting
Au nanoparticles@MoS2 core-shell structures with moderate MoS2 coverage for efficient photocatalytic water splitting
复制标题
Au纳米颗粒@MoS2核壳结构，具有适度的MoS2覆盖度，可实现高效光催化水分解
DOI：
10.1016/j.jallcom.2017.02.240
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发表时间：
2017-06-05
影响因子：
6.2
通讯作者：
Li, Xuanhua
中科院分区：
文献类型：
--
作者：
Yang, Lin;Guo, Shaohui;Li, Xuanhua
金属纳米颗粒（NPs）@MoS2核壳结构作为等离子体增强的光催化剂，近年来被研究用于高效光催化分解水。然而，关于MoS 2的覆盖度对光催化分解水的影响的报道很少。本文系统地研究了在Au NPs@MoS2核壳杂化结构中MoS 2的覆盖度对光催化分解水的影响。通过调节水热反应时间（3 h ~ 18 h），可以获得不同的MoS 2在Au纳米颗粒上的覆盖率。我们发现，适度的MoS 2覆盖（即12 h）可以保证H2O分子穿透MoS 2壳层到达Au-MoS 2结。此外，适度的MoS 2覆盖有利于入射光激发Au NPs核周围的强等离子体激元效应。具有中等MoS 2覆盖度的Au NPs@MoS2核壳结构中最有效的电子空穴对分离效率也是高性能光催化水裂解的可能原因。结果，在Au NPS@MoS2核-壳结构中，中等MoS 2覆盖率显示出最大的氢气产生产率（2110.7 μ mol）。此外，氢气产率也明显高于纯MoS 2球（880.0 μ mol/g）和Au NPs与MoS 2球的简单混合物（1380.3 μ mol/g）。我们的研究加强了Au NPs@MoS2核壳结构中适度MoS 2覆盖对于高性能光催化水裂解的意义。(C)2017爱思唯尔B. V.保留所有权利。
Metal nanoparticles (NPs)@MoS2 core-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 MoS2 on the photocatalytic water splitting. Here, we systematically study the effect of the MoS2 coverage on the photocatalytic water splitting in the Au NPs@MoS2 core-shell hybrid structures. The different MoS2 coverage on the Au NPs can be obtained through tuning the hydrothermal reaction time from 3 h to 18 h. We find that the moderate MoS2 coverage (i.e. 12 h) can ensure the H2O molecules penetrating the MoS2 shell and reaching to the Au-MoS2 junctions. In addition, the moderate MoS2 coverage is beneficial for the incident light to excite the strong plasmonic effect around the Au NPs core. The most efficient separation efficiency of electronehole pairs in the Au NPs@MoS2 core-shell structure with the moderate MoS2 coverage is also possible reason for the high performance photo-catalytic water splitting. As a result, the moderate MoS2 coverage shows the largest yield of hydrogen gas production (2110.7 mu mol) among the Au NPs@MoS2 core-shell structures. In addition, the yield of hydrogen gas production is also obvious higher than that of the pure MoS2 spheres (880.0 mu mol/g) and simple mixture of Au NPs and MoS2 sphere (1380.3 mu mol/g). Our study strengthens the significance of the moderate MoS2 coverage in the Au NPs@MoS2 core-shell structures for high-performance photocatalytic water splitting. (C) 2017 Elsevier B.V. All rights reserved.