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Interface Modulation of MoS2 /Metal Oxide Heterostructures for Efficient Hydrogen Evolution Electrocatalysis.

Jue Hu1, Chengxu Zhang1, Yizhen Zhang2

  • 1Faculty of Science, Kunming University of Science and Technology, Kunming, 650093, China.

Small (Weinheim an Der Bergstrasse, Germany)
|June 9, 2020
PubMed
Summary

This study developed earth-abundant molybdenum disulfide (MoS2) based electrocatalysts decorated with metal oxides for efficient hydrogen evolution reaction (HER) in alkaline media. The MoS2/Ni2O3H catalyst shows excellent performance and stability.

Keywords:
MoS2/metal oxides heterostructuresalkaline environmenthydrogen evolution reactioninterface modulationreaction kinetics

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Catalysis

Background:

  • Developing efficient earth-abundant electrocatalysts for the hydrogen evolution reaction (HER) in alkaline media is crucial.
  • Molybdenum disulfide (MoS2) based catalysts face challenges due to sluggish kinetics in alkaline environments.

Purpose of the Study:

  • To fabricate high-performance MoS2-based HER electrocatalysts by modulating interface electronic structure using metal oxides.
  • To investigate the role of metal oxides in enhancing HER activity in alkaline media.

Main Methods:

  • Fabrication of MoS2/metal oxide heterostructures.
  • Electrocatalytic activity testing for HER in 1 m KOH.
  • Electrochemical impedance spectroscopy to determine charge-transfer resistance.
  • Chronopotentiometry for long-term stability assessment.
  • Density functional theory (DFT) calculations to understand electronic structure and reaction mechanisms.

Main Results:

  • MoS2/metal oxide heterostructures significantly improved HER electrocatalytic activities.
  • The MoS2/Ni2O3H catalyst achieved an overpotential of 84 mV at 10 mA cm-2 with a low charge-transfer resistance of 1.5 Ω.
  • MoS2/Ni2O3H demonstrated a current density 24 times higher than bare MoS2 at 200 mV overpotential.
  • Catalysts exhibited outstanding long-term stability.
  • DFT calculations revealed Ni-3d band activation in Ni2O3H facilitates fast electron transfer.

Conclusions:

  • Metal oxide decoration effectively enhances HER kinetics in MoS2-based catalysts by promoting water dissociation.
  • MoS2/Ni2O3H is a highly efficient and stable electrocatalyst for HER in alkaline media.
  • Interface electronic structure modulation is a viable strategy for designing advanced HER electrocatalysts.