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Vanadium-doping in interlayer-expanded MoS2 nanosheets for efficient electrocatalytic hydrogen evolution reaction

Abstract

Two-dimensional layered MoS2 nanosheets are regarded as a promising catalyst for electrocatalytic hydrogen generation but suffer from limitations of catalytically inert basal planes and poor intrinsic conductivity. In this work, we report a simple hydrothermal method to synthesize the defect-rich MoS2 nanosheets featuring vanadium (V) doping, widely expanded interlayer spacings, and high content of metallic 1T-phase towards efficient hydrogen evolution reaction (HER). The structural characteristics of V(IV)&V(II) co-doping, mixed 1T&2H phases and wide interlayer expansion endow the nanosheets with plentiful disorders and rich defects, thereby resulting in abundant active sites. Furthermore, the V(IV)&V(II) co-doping brings in electronic benefits of narrowed bandgap, improved intrinsic conductivity and optimized hydrogen adsorption free energy of basal planes. By tuning the V dopant content, the 10%V-MoS2 catalyst shows an optimized HER performance with a low overpotential of 146 mV at 10 mA cm-2, and a small Tafel slope of 48 mV dec-1, long operation stability of 80 h. Our work opens up new opportunities for improving electrochemical HER performance of layered transition metal dichalcogenides (TMDs) by synergistic structural and compositional modulations.

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Supplementary files

Article information


Submitted
03 Feb 2020
Accepted
16 May 2020
First published
18 May 2020

Inorg. Chem. Front., 2020, Accepted Manuscript
Article type
Research Article

Vanadium-doping in interlayer-expanded MoS2 nanosheets for efficient electrocatalytic hydrogen evolution reaction

T. Liu, C. Fang, B. Yu, Y. You, H. Niu, R. Zhou, J. Zhang and J. Xu, Inorg. Chem. Front., 2020, Accepted Manuscript , DOI: 10.1039/D0QI00135J

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