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Graphene Quantum Dot-Mediated Atom-Layer Semiconductor Electrocatalyst for Hydrogen Evolution.

Bingjie Hu1, Kai Huang2, Bijun Tang3

  • 1Institute of Nanochemistry and Nanobiology, School of Environmental and Chemical Engineering, Shanghai University, 99 Shangda Road, BaoShan District, Shanghai, 200444, People's Republic of China.

Nano-Micro Letters
|September 28, 2023
PubMed
Summary
This summary is machine-generated.

Functionalized graphene quantum dots (GQDs) enhance molybdenum disulfide (MoS2) for improved hydrogen evolution reaction (HER) performance. This GQD-induced strategy creates thinner, more active MoS2 nanosheets for catalysis.

Keywords:
Atom-layerGraphene quantum dotsHydrogen evolution reactionMoS2 nanosheetsSemiconductor electrocatalysts

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Area of Science:

  • Materials Science
  • Catalysis
  • Nanotechnology

Background:

  • Semiconducting 2H-phase molybdenum disulfide (2H-MoS2) shows promise for hydrogen evolution reaction (HER) but faces performance limitations.
  • Enhancing HER activity in MoS2 is crucial for its practical applications.

Purpose of the Study:

  • To theoretically predict and experimentally validate functionalized graphene quantum dots (GQDs) for enhancing MoS2 HER performance.
  • To develop a GQD-induced in-situ bottom-up strategy for fabricating near atom-layer MoS2 nanosheets.

Main Methods:

  • Theoretical calculations to predict GQD functionalization for HER enhancement.
  • In-situ bottom-up synthesis of MoS2 nanosheets mediated by functionalized GQDs.
  • Modulation of electron withdrawing/donating functional groups on GQDs to control MoS2 structure and activity.

Main Results:

  • Functionalized GQDs significantly enhance the HER activity of bulk MoS2.
  • The concentration and electron-withdrawing strength of functional groups on GQDs correlate with MoS2 nanosheet thickness and activity.
  • Near atom-layer MoS2 nanosheets mediated with SO3-functionalized GQDs (ALQD-SO3) exhibit markedly improved HER performance.

Conclusions:

  • The GQD-induced strategy offers a simple and efficient method to improve MoS2 catalytic applications.
  • This approach has potential for developing nanosheets in other transition-metal dichalcogenide materials.
  • Functionalized GQDs are effective in tailoring MoS2 properties for advanced catalytic applications.