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Surface-Electron Coupling for Efficient Hydrogen Evolution.

Weiwei Fu1, Yanwei Wang1, Jisong Hu2

  • 1The School of Chemistry and Chemical Engineering, State Key Laboratory of Power Transmission Equipment & System Security and New Technology, Chongqing University, 174 Shazheng Street, Shapingba District, Chongqing City, 400044, P. R. China.

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Summary
This summary is machine-generated.

Nitrogen modification of graphene/vanadium carbide heterostructures enhances alkaline hydrogen evolution. This surface engineering approach improves material activity and stability for catalysis.

Keywords:
N modificationalkaline hydrogen evolutionelectronic couplingepitaxial growthsynergistic catalysis

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Catalysis

Background:

  • Achieving high activity and stability in materials for the alkaline hydrogen evolution reaction (HER) under working conditions is crucial.
  • Surface modification of materials is a key strategy to optimize their catalytic properties.

Purpose of the Study:

  • To report the first controllable surface modification of graphene/vanadium carbide (G/V8C7) heterostructures using nitrogen.
  • To investigate the synergistic catalytic effects of nitrogen modification on the G/V8C7 heterostructures for alkaline HER.

Main Methods:

  • Controllable surface modification of G/V8C7 heterostructures with nitrogen.
  • Experimental observations and density-functional-theory (DFT) calculations to study multi-regional synergistic catalysis.
  • Analysis of electronic coupling between nitrogen and vanadium atoms and its effect on water adsorption/dissociation.

Main Results:

  • Introduced nitrogen atoms electronically couple with vanadium atoms, lowering the energy barrier for water adsorption and dissociation.
  • Increased electron density on epitaxial graphene enhances its suitability for H* adsorption and subsequent reaction.
  • Nitrogen-modified G/V8C7 exhibits improved activity and stability for the alkaline hydrogen evolution reaction.

Conclusions:

  • Surface engineering via nitrogen modification is an effective strategy to enhance the HER performance of G/V8C7 heterostructures.
  • The findings provide insights into multi-regional synergistic catalysis and can be extended to other transition-metal carbides.