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Interlayer Delocalized Electrons Activate Basal Plane for Ultrahigh-Current-Density Hydrogen Evolution.

Jianqiang Chen1, Sirui Huang1, Yang Yang1

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Researchers enhanced the hydrogen evolution reaction (HER) on transition metal dichalcogenides (TMDCs) by incorporating copper atoms. This strategy boosts electron transfer, significantly improving catalytic efficiency for clean hydrogen production.

Keywords:
delocalized electronshydrogen evolutionlayer-dependent catalystsvertical conduction

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Catalysis

Background:

  • The basal plane of transition metal dichalcogenides (TMDCs) exhibits poor efficiency for the hydrogen evolution reaction (HER) due to slow charge transfer kinetics.
  • Improving charge transport is crucial for unlocking the catalytic potential of TMDCs.

Purpose of the Study:

  • To develop a strategy for enhancing HER activity on the inert basal plane of TMDCs.
  • To enable efficient vertical electron transfer within the van der Waals (vdW) layers.

Main Methods:

  • Density functional theory (DFT) calculations guided the strategy.
  • Copper (Cu) atoms were incorporated into the interlayer of tantalum disulfide (TaS2).
  • On-chip microcell was used to measure HER activity.

Main Results:

  • Incorporating Cu atoms created vertical charge transfer pathways via d-orbital delocalization.
  • Vertical conductivity of TaS2 increased by two orders of magnitude.
  • HER current density on the TaS2 basal plane increased 20-fold, reaching 800 mA cm-2 at -0.4 V.

Conclusions:

  • Delocalized electrons in vdW gaps effectively overcome hopping limitations.
  • This approach significantly enhances the HER performance of TMDC basal planes.
  • The strategy offers a promising route for developing efficient electrocatalysts.