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    Synergistic Interlayer and Defect Engineering in VS2 Nanosheets toward Efficient Electrocatalytic Hydrogen Evolution Reaction

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    Small-2017-Chenhui-Zhang.pdf
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    Description:
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    Type
    Article
    Authors
    Zhang, Junjun
    Zhang, Chenhui cc
    Wang, Zhenyu
    Zhu, Jian cc
    Wen, Zhiwei
    Zhao, Xingzhong
    Zhang, Xixiang cc
    Xu, Jun
    Lu, Zhouguang
    KAUST Department
    Material Science and Engineering Program
    Physical Science and Engineering (PSE) Division
    Date
    2017-12-27
    Online Publication Date
    2017-12-27
    Print Publication Date
    2018-03
    Permanent link to this record
    http://hdl.handle.net/10754/626739
    
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    Abstract
    A simple one-pot solvothermal method is reported to synthesize VS2 nanosheets featuring rich defects and an expanded (001) interlayer spacing as large as 1.00 nm, which is a ≈74% expansion as relative to that (0.575 nm) of the pristine counterpart. The interlayer-expanded VS2 nanosheets show extraordinary kinetic metrics for electrocatalytic hydrogen evolution reaction (HER), exhibiting a low overpotential of 43 mV at a geometric current density of 10 mA cm-2 , a small Tafel slope of 36 mV dec-1 , and long-term stability of 60 h without any current fading. The performance is much better than that of the pristine VS2 with a normal interlayer spacing, and even comparable to that of the commercial Pt/C electrocatalyst. The outstanding electrocatalytic activity is attributed to the expanded interlayer distance and the generated rich defects. Increased numbers of exposed active sites and modified electronic structures are achieved, resulting in an optimal free energy of hydrogen adsorption (∆GH ) from density functional theory calculations. This work opens up a new door for developing transition-metal dichalcogenide nanosheets as high active HER electrocatalysts by interlayer and defect engineering.
    Citation
    Zhang J, Zhang C, Wang Z, Zhu J, Wen Z, et al. (2017) Synergistic Interlayer and Defect Engineering in VS2 Nanosheets toward Efficient Electrocatalytic Hydrogen Evolution Reaction. Small: 1703098. Available: http://dx.doi.org/10.1002/smll.201703098.
    Sponsors
    This work was financially supported by the National Natural Science Foundation of China (No. 21671096), the Shenzhen Key Laboratory Project (No. ZDSYS201603311013489), the Natural Science Foundation of Shenzhen (Nos. JCYJ20170412153139454, JCYJ20150630145302231, JCYJ20150331101823677), and the Fundamental Research Funds for the Central Universities (No. JZ2016HGTB0725).
    Publisher
    Wiley
    Journal
    Small
    DOI
    10.1002/smll.201703098
    PubMed ID
    29280269
    Additional Links
    http://onlinelibrary.wiley.com/doi/10.1002/smll.201703098/full
    ae974a485f413a2113503eed53cd6c53
    10.1002/smll.201703098
    Scopus Count
    Collections
    Articles; Physical Science and Engineering (PSE) Division; Material Science and Engineering Program

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