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Related Experiment Video

Updated: Jun 5, 2026

Protein Film Infrared Electrochemistry Demonstrated for Study of H2 Oxidation by a [NiFe] Hydrogenase
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All-Edge MoS2 by Ultramicrotomy for Hydrogen Evolution.

Ankit Bhardwaj1,2, Abdulghani Ismail1,2, Kalluvadi Veetil Saurav2,3

  • 1Department of Physics and Astronomy, School of Natural Sciences, University of Manchester, Manchester M13 9PL, United Kingdom.

ACS Nano
|October 27, 2025
PubMed
Summary

Precision slicing of molybdenum disulfide (MoS2) creates all-edge structures for enhanced hydrogen evolution reaction (HER) catalysis. Performance depends on edge accessibility and structure, not just abundance.

Keywords:
2D materialsedgeselectrocatalysishydrogen evolution reactionmolybdenum disulfideultramicrotomy

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Catalysis

Background:

  • Molybdenum disulfide (MoS2) is a key catalyst for the hydrogen evolution reaction (HER).
  • Edge sites are more catalytically active than basal planes, but precise control over MoS2 structure is limited.
  • Existing methods produce mixed basal plane and edge sites, hindering controlled active site exposure.

Purpose of the Study:

  • To develop a precise method for fabricating MoS2 structures with exclusively edge terminations.
  • To investigate the influence of edge morphology, alignment, and accessibility on HER performance.
  • To understand the relationship between structure, electron transport, and catalytic activity.

Main Methods:

  • Fabrication of MoS2 structures using an ultramicrotomy slicing technique.
  • Creation of all-edge MoS2 terminations with tunable spacing and electrode distance.
  • Electrochemical benchmarking of HER performance on glassy carbon electrodes.
  • Decoration with gold (Au) nanoparticles to assess performance enhancement.

Main Results:

  • Precision-sliced all-edge MoS2 structures showed tunable morphology and alignment.
  • Thinner, disordered, and open-edge structures outperformed thicker, compact, and aligned ones.
  • Catalytic performance is influenced by edge accessibility, geometric openness, and basal plane electron transfer resistance.
  • Pristine vMoS2-⊥ had an overpotential of ~300 mV at 10 mA cm-2; Au decoration reduced it to 180 mV.

Conclusions:

  • The study provides a platform for rational edge engineering in 2D electrocatalysts.
  • Findings offer mechanistic insights into HER activity in MoS2.
  • The slicing technique shows potential for scalable production of tailored MoS2 catalysts.