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MoSe₂-GO/rGO Composite Catalyst for Hydrogen Evolution Reaction.

Wenwu Guo1, Quyet Van Le2,3, Amirhossein Hasani4

  • 1School of Chemical Engineering and Materials Science, Chung-Ang University, 84 Heukseok-ro, Dongjak-gu, Seoul 06974, Korea. guowenwu95@gmail.com.

Polymers
|April 10, 2019
PubMed
Summary

This study engineered molybdenum selenide (MoSe₂) nanosheet composites with graphene oxide (GO) and reduced graphene oxide (rGO). These composites significantly enhance electrocatalytic hydrogen evolution reaction performance by preventing aggregation and improving carrier transfer.

Keywords:
electrocatalysthydrogen evolution reactionmolybdenum selenide compositestransition metal dichalcogenides

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Nanotechnology

Background:

  • Transition metal dichalcogenides (TMDs) are actively researched for catalytic applications.
  • Engineering TMD composites aims to enhance their catalytic efficiency.
  • Molybdenum selenide (MoSe₂) shows promise but can suffer from aggregation issues.

Purpose of the Study:

  • To develop a modified solution-processed method for MoSe₂ nanosheets.
  • To create MoSe₂ composites with graphene oxide (GO) and reduced graphene oxide (rGO).
  • To improve the electrocatalytic hydrogen evolution reaction (HER) performance of MoSe₂.

Main Methods:

  • Solution-processed synthesis of MoSe₂ nanosheets.
  • Composite formation of MoSe₂ with GO and rGO at varying ratios.
  • Characterization using XRD, Raman, XPS, TEM, EDX, and SEM.
  • Electrocatalytic performance evaluation for HER.

Main Results:

  • Pure MoSe₂ nanosheets had a high Tafel slope (80 mV/dec).
  • MoSe₂-GO composites showed a reduced Tafel slope of 57 mV/dec (6:4 ratio).
  • MoSe₂-rGO composites exhibited a Tafel slope of 67 mV/dec (4:6 ratio).

Conclusions:

  • MoSe₂-GO and MoSe₂-rGO composites effectively prevent MoSe₂ aggregation.
  • Composites demonstrate improved electrocatalytic HER performance compared to pure MoSe₂.
  • Enhanced catalytic activity is attributed to improved interfacial contact and carrier transfer.