Hydrothermally grown MoS2 nanosheets under non-equilibrium condition and its electrocatalytic hydrogen evolution performance

被引:4
作者
Shaikh, Naznin [1 ]
Mukhopadhyay, Indrajit [1 ,2 ]
Ray, Abhijit [1 ,2 ]
机构
[1] Pandit Deendayal Energy Univ, Sch Technol, Dept Solar Energy, Raisan 382426, Gandhinagar, India
[2] Pandit Deendayal Energy Univ, Solar Res & Dev Ctr, Raisan 382426, Gandhinagar, India
关键词
ACTIVE EDGE SITES; GRAIN-BOUNDARIES; HIGHLY EFFICIENT; DEFECTS; MONOLAYERS; IDENTIFICATION; NANOPARTICLES; ADSORPTION; GRAPHENE;
D O I
10.1557/s43578-022-00601-6
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
Molybdenum disulphide (MoS2) is a potential noble metal-free electrocatalyst for the Hydrogen Evolution Reaction (HER). However, it's HER activity is largely governed by the existence of edge sites created by the sulphur non-stoichiometry. Herein we report synthesis of highly disordered 2D-MoS2 nanosheets by simple hydrothermal route under a non-equilibrium growth condition. Excess sulphur content in the precursor than that required to synthesize stoichiometric MoS2 causes wide variation in their morphologies and physico-chemical properties. The sulphur enriched MoS2+delta nanosheets with high density of ripples and wrinkles show the lowest overpotential of 234 mV at a current density of 10 mA/cm(2) and also low Tafel slope of 82 mV/dec in acidic electrolyte. Further, a Density Functional Theory-based formalism is employed to mimic various possible configuration of sulphur addition within the supercell and to understand its role over hydrogen absorption and desorption processes.
引用
收藏
页码:1892 / 1903
页数:12
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