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

Author:

Zhang Junjun12,Zhang Chenhui3ORCID,Wang Zhenyu1,Zhu Jian1ORCID,Wen Zhiwei1,Zhao Xingzhong2ORCID,Zhang Xixiang3,Xu Jun4,Lu Zhouguang1

Affiliation:

1. Shenzhen Key Laboratory of Hydrogen Energy and Department of Materials Science and Engineering Southern University of Science and Technology Shenzhen 518055 P. R. China

2. School of Physics and Technology Wuhan University Wuhan 430072 P. R. China

3. Physical Sciences and Engineering Division King Abdullah University of Science and Technology Thuwal 23955‐6900 Saudi Arabia

4. School of Electronic Science and Applied Physics Hefei University of Technology Hefei 230009 P. R. China

Abstract

AbstractA 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.

Funder

National Natural Science Foundation of China

Publisher

Wiley

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