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Facile Spin-Coated MoS2 Thin Films from a Single-Source Precursor for HER Activity.

Talha Nisar1,2, Muhammad Adeel Asghar3, Abu Nasar Siddique4

  • 1School of Science, Constructor University, Campus Ring 1, 28759 Bremen, Germany.

ACS Applied Energy Materials
|July 18, 2025
PubMed
Summary

Molybdenum disulfide (MoS2) thin films were synthesized for hydrogen evolution reaction (HER) catalysis. Thinner MoS2 films exhibited superior HER activity due to beneficial sulfur vacancies, outperforming thicker films and other 2D materials.

Keywords:
2D-materialMoS2electrocatalysthydrogen evolution reaction (HER)single source precursorsolution-based depositiontransition metal dichalcogenide (TMD)

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Catalysis

Background:

  • The hydrogen evolution reaction (HER) is crucial for clean energy production, requiring efficient catalysts.
  • Molybdenum disulfide (MoS2) is a promising, earth-abundant alternative to platinum for HER catalysis.
  • Engineering MoS2 thin films can create active sites for enhanced HER performance.

Purpose of the Study:

  • To synthesize large-area MoS2 thin films for HER applications.
  • To investigate the effect of film thickness on HER activity.
  • To understand the role of sulfur vacancies in HER performance.

Main Methods:

  • Preparation of MoS2 thin films via spin coating of MoCl5 precursor followed by sulfurization annealing.
  • Characterization using Raman spectroscopy, X-ray diffraction (XRD), UV-vis, and X-ray photoelectron spectroscopy (XPS).
  • Electrochemical testing to evaluate HER activity and Tafel slope.

Main Results:

  • Successfully synthesized MoS2 thin films with controllable thickness.
  • Demonstrated HER activity in synthesized MoS2 films, with thinner films (10 nm) showing better performance (290 mV overpotential) than thicker films (50 nm at 369 mV).
  • XPS analysis revealed sulfur vacancies, which positively correlate with enhanced HER activity. A Tafel slope of 80 mV/decade was achieved.

Conclusions:

  • MoS2 thin films are effective catalysts for the hydrogen evolution reaction.
  • Film thickness and sulfur vacancy concentration are critical factors influencing HER performance.
  • The synthesized MoS2 films offer a cost-effective and efficient alternative to platinum-based catalysts for HER.