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An amorphous MoS modified g-C3N4 composite for efficient photocatalytic hydrogen evolution under visible light.

Xia Li1, Bo Wang1, Xia Shu1

  • 1School of Material Sciences and Engineering, Hefei University of Technology Hefei 230009 China ycwu@hfut.edu.cn lvjun117@126.com.

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Summary

A novel molybdenum disulfide (MoS )/graphitic carbon nitride (g-C3N4) composite photocatalyst was synthesized for enhanced hydrogen production. The composite achieved a significantly higher H2-evolution rate, 70 times that of pure g-C3N4, under visible light irradiation.

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Area of Science:

  • Materials Science
  • Photocatalysis
  • Renewable Energy

Background:

  • Graphitic carbon nitride (g-C3N4) is a promising metal-free semiconductor photocatalyst.
  • Enhancing the photocatalytic activity of g-C3N4 for hydrogen evolution remains a key challenge.
  • Molybdenum disulfide (MoS ) has shown potential in improving photocatalytic performance.

Purpose of the Study:

  • To fabricate a novel MoS /g-C3N4 composite photocatalyst.
  • To investigate the hydrogen-evolution performance of the composite under visible light.
  • To understand the mechanism behind the enhanced photocatalytic activity.

Main Methods:

  • Sonochemical synthesis of MoS /g-C3N4 composite.
  • Hydrothermal method for amorphous MoS synthesis.
  • Two-step thermal polycondensation for g-C3N4 nanosheet production.
  • Visible light photocatalytic hydrogen evolution testing.

Main Results:

  • The MoS /g-C3N4 (7 wt%) composite exhibited a maximum H2-evolution rate of 1586 μmol g-1 h-1.
  • This rate is approximately 70 times higher than that of pure g-C3N4 nanosheets.
  • The composite demonstrated enhanced photoinduced electron-hole pair separation and provided numerous active sites.

Conclusions:

  • The fabricated MoS /g-C3N4 composite significantly enhances visible-light-driven hydrogen evolution.
  • The improved performance is attributed to the formation of intimate heterojunctions and efficient charge separation.
  • MoS acts as an effective co-catalyst, boosting the H+ to H2 conversion efficiency.