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Combining ZnS with WS2 Nanosheets to Fabricate a Broad-spectrum Composite Photocatalyst for Hydrogen Evolution

Abstract

Since hydrogen storage methods are flourishing, “hydrogen economy” attracts a lot of scientists’ attentions. Photocatalytic hydrogen evolution (PHE) in efficient and stable ways are necessary. Although some photocatalysts are highly efficient, they are containing noble metals or heavy metals which are either expensive or environment-unfriendly. Therefore, fabricating economical and environmental-friendly photocatalysts are still challenges now. ZnS is not an efficient photocatalyst for hydrogen evolution, because of the ultraviolet absorption only, the high recombination rate of photoinduced electron-holes, and the photocorrosion by photogenerated holes. WS2 nanosheets are known as excellent cocatalysts. It is the frist time to combine ZnS with WS2 nanosheet (with several layers) together to fabricate economical and environmental-friendly ZnS/WS2 nanocomposites. Combining ZnS with WS2 nanosheets together can broaden the absorption spectrum and benefit for improving the electron-hole pairs separation efficiency. WS2 nanosheets serve as electron transporter, PHE activity sites, and also as ZnS nanoparticles immobilization scaffold in the composite. The PHE activity of ZnS/WS2 nanocomposite is three times higher than that of pure ZnS nanoparticles under Xe lamp (300 W) irradiation, and the catalyst shows excellent photostability. The strategy presented in this study may have potential use in preparing economical and environmental-friendly photocatalysts.

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Publication details

The article was received on 08 Jul 2017, accepted on 14 Sep 2017 and first published on 14 Sep 2017


Article type: Paper
DOI: 10.1039/C7NJ02474F
Citation: New J. Chem., 2017, Accepted Manuscript
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    Combining ZnS with WS2 Nanosheets to Fabricate a Broad-spectrum Composite Photocatalyst for Hydrogen Evolution

    Y. Zhong, Y. Shao, B. Huang, X. Hao and Y. Z. Wu, New J. Chem., 2017, Accepted Manuscript , DOI: 10.1039/C7NJ02474F

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