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Updated: Jul 8, 2025

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Molybdenum/selenium based heterostructure catalyst for efficient hydrogen evolution: Effects of ionic dissolution and

Mameng Yang1, Weiwei Bao1, Junjun Zhang2

  • 1National and Local Joint Engineering Laboratory for Slag Comprehensive Utilization and Environmental Technology, School of Materials Science and Engineering, Shaanxi University of Technology, Hanzhong 723000, Shaanxi, PR China.

Journal of Colloid and Interface Science
|December 13, 2023
PubMed
Summary

Investigating transition metal chalcogenides for water electrolysis, this study reveals that dissolved Mo and Se species re-adsorb to form new active sites, enhancing hydrogen evolution reaction (HER) activity and durability.

Keywords:
Heterojunction structureHydrogen evolutionIn situ RamanSurface reconstructionTransition metal selenides

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Catalysis

Background:

  • Transition metal chalcogenides (TMCs) are promising electrocatalysts for water electrolysis.
  • The precise active sites and reaction mechanisms of TMCs, particularly during alkaline hydrogen evolution, remain unclear.

Purpose of the Study:

  • To elucidate the species evolution of Molybdenum (Mo) and Selenium (Se) in MoSe2@CoSe2 heterostructures during alkaline hydrogen evolution.
  • To identify the real catalytic species and understand their role in enhancing electrocatalytic performance.

Main Methods:

  • In situ Raman spectroscopy was employed to monitor the real-time evolution of Mo and Se species.
  • Theoretical calculations were performed to assess the catalytic activity of newly formed species.

Main Results:

  • Mo and Se dissolved as MoO4^2- and SeO3^2- and re-adsorbed to form Mo2O7^2- and SeO4^2-.
  • These new species significantly enhanced the hydrogen evolution reaction (HER) catalytic activity of Cobalt hydroxide (Co(OH)2).
  • The addition of MoO4^2- and SeO3^2- improved both the activity and durability of Co(OH)2 electrodes.

Conclusions:

  • The study clarifies the dynamic species evolution of Mo and Se during HER.
  • Newly formed Mo and Se species act as crucial active sites, boosting catalytic efficiency and stability.
  • This research provides fundamental insights into catalyst surface transformations and their impact on electrocatalytic mechanisms.