Lin, L., Miao, N., Huang, J. et al. (6 more authors) (2017) A photocatalyst of sulphur depleted monolayered molybdenum sulfide nanocrystals for dye degradation and hydrogen evolution reaction. Nano Energy, 38. pp. 544-552. ISSN 2211-2855
Abstract
Molybdenum disulfide (MoS2) has a theoretical catalytic activity comparable to Pt but in practice is a poor catalyst in bulk form due to the scarcity of metal edge sites and low electrical conductivity. Recent developments on MoS2 monolayers (MLs) are more encouraging in developing cheap and efficient catalysts, but the majority metal atoms are on the basal plane and catalytically inactive. The rapid recombination of the electron-hole pairs and electronic band structure of the most stable 2H-MoS2 MLs are also unsuitable for efficient photocatalysis, especially for solar-driven water splitting. Here, we show that reducing the lateral size and creating sulphur (S) vacancies of MoS2 MLs not only increases dramatically the density of catalytically active sites, but also adjusts the band structure to become highly suitable for solar-driven catalysis. In addition, this preparation efficiently avoids fast charge recombination associated with MoS2, improves light harvesting, and gives a newly formed metallic state to transfer electrons for photocatalytic reactions. By way of example, we have demonstrated remarkable photocatalytic degradation of methylene blue (MB) and methylene orange (MO) dyes using the S-depleted Mo-S nanocrystals (NCs, 2–25 nm). The NCs are also promising to efficiently generate hydrogen (H2) from water with sacrificial reagents and solar light irradiation. Our study shows how careful design and modification of materials can result in highly efficient photocatalysts, which give considerable opportunities of the transition metal dichalcogenides (TMDs) beyond just MoS2 to develop highly efficient and economic catalysts.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | © 2017 Elsevier. This is an author produced version of a paper subsequently published in Nano Energy. Uploaded in accordance with the publisher's self-archiving policy. Article available under the terms of the CC-BY-NC-ND licence (https://creativecommons.org/licenses/by-nc-nd/4.0/). |
Keywords: | Monolayered molybdenum disulfide; Nanocrystals; Photocatalyst; Electronic structure; Hydrogen evolution reaction |
Dates: |
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Institution: | The University of Sheffield |
Academic Units: | The University of Sheffield > Faculty of Engineering (Sheffield) > Department of Materials Science and Engineering (Sheffield) |
Depositing User: | Symplectic Sheffield |
Date Deposited: | 12 Jul 2017 14:25 |
Last Modified: | 09 Jun 2019 00:40 |
Published Version: | https://doi.org/10.1016/j.nanoen.2017.06.008 |
Status: | Published |
Publisher: | Elsevier |
Refereed: | Yes |
Identification Number: | 10.1016/j.nanoen.2017.06.008 |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:118937 |