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Conductive Molybdenum Sulfide for Efficient Electrocatalytic Hydrogen Evolution.

Xueqing Gao1, Jing Qi1, Shanhong Wan1

  • 1Key Laboratory of Applied Surface and Colloid Chemistry Ministry of Education, School of Chemistry and Chemical Engineering, Shaanxi Normal University, Xi'an, 710119, China.

Small (Weinheim an Der Bergstrasse, Germany)
|October 11, 2018
PubMed
Summary
This summary is machine-generated.

Ultrathin molybdenum sulfide (MoS2) nanosheets on reduced graphene oxide boost hydrogen evolution reaction (HER) performance. Bent layers and expanded spacing enhance electrical conductivity and activity for efficient electrolysis.

Keywords:
electrocatalysiselectrochemistryhydrogen evolutionmolybdenum sulfidewater splitting

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Nanotechnology

Background:

  • Molybdenum sulfide (MoS2) is a promising electrocatalyst for the hydrogen evolution reaction (HER).
  • High electrical resistance between MoS2 layers limits charge transfer and catalytic performance.
  • Reduced graphene oxide (RGO) is a conductive support material.

Purpose of the Study:

  • To develop ultrathin MoS2 nanosheets with enhanced properties for electrocatalytic HER.
  • To investigate the effect of bent layers and expanded inter-layer spacing on MoS2 performance.
  • To improve the electrical conductivity and active site accessibility of MoS2 for electrolysis.

Main Methods:

  • Synthesis of ultrathin MoS2 nanosheets with bent layers on RGO.
  • Characterization of MoS2 morphology, layer number, and inter-layer spacing.
  • Computational studies to understand the electronic and catalytic properties.
  • Electrocatalytic testing for HER performance.

Main Results:

  • MoS2 nanosheets were predominantly 1-2 layers thick with significantly expanded inter-layer distances (≈1 nm).
  • Bent single layers exhibited enhanced electrical conductivity and intrinsic activity compared to flat single layers.
  • The hybrid material demonstrated high activity for HER, achieving 10 mA cm-2 at a low overpotential of 66 mV.
  • Confined sizes and distorted lattices increased active sites and improved mass diffusion.

Conclusions:

  • The developed MoS2/RGO hybrid material significantly enhances electrocatalytic HER performance.
  • Bent layers and expanded inter-layer spacing are key factors for improved conductivity and activity.
  • This approach offers a promising strategy for designing efficient electrocatalysts for hydrogen production.