Synergistic Interlayer and Defect Engineering in VS2 Nanosheets toward Efficient Electrocatalytic Hydrogen Evolution Reaction
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ArticleAuthors
Zhang, JunjunZhang, Chenhui

Wang, Zhenyu
Zhu, Jian

Wen, Zhiwei
Zhao, Xingzhong
Zhang, Xixiang

Xu, Jun
Lu, Zhouguang
KAUST Department
Material Science and Engineering ProgramPhysical Science and Engineering (PSE) Division
Date
2017-12-27Online Publication Date
2017-12-27Print Publication Date
2018-03Permanent link to this record
http://hdl.handle.net/10754/626739
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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
WileyJournal
SmallPubMed ID
29280269Additional Links
http://onlinelibrary.wiley.com/doi/10.1002/smll.201703098/fullae974a485f413a2113503eed53cd6c53
10.1002/smll.201703098
Scopus Count
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