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N-Modified NiO Surface for Superior Alkaline Hydrogen Evolution.

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Summary
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Nitrogen atoms precisely modulate nickel oxide surfaces, enhancing alkaline hydrogen evolution kinetics. This breakthrough accelerates electrolysis for clean hydrogen production with improved efficiency and stability.

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Area of Science:

  • Electrochemistry
  • Materials Science
  • Catalysis

Background:

  • Sluggish hydrogen evolution reaction (HER) kinetics in alkaline media hinder efficient water-alkali and chlor-alkali electrolysis.
  • Developing advanced electrocatalysts is crucial for large-scale green hydrogen production.

Purpose of the Study:

  • To enhance alkaline HER kinetics by precisely modulating nickel oxide (NiO) surfaces using nitrogen doping.
  • To investigate the role of low-coordinated oxygen atoms and surface charge redistribution in accelerating the HER.

Main Methods:

  • Nitrogen modulation of nickel oxide surfaces.
  • Electrochemical characterization (e.g., overpotential, current density, stability tests).
  • Theoretical calculations (e.g., density functional theory) to understand reaction mechanisms.

Main Results:

  • Nitrogen-modulated NiO (N-NiO) exhibits significantly enhanced HER activity.
  • Achieved an overpotential of -100 mV at -10 mA/cm² in 1.0 M KOH.
  • Demonstrated robust stability for over 90 hours.

Conclusions:

  • Surface charge redistribution in N-NiO facilitates water dissociation and H recombination/OH desorption.
  • Nitrogen modulation of NiO is a promising strategy for efficient alkaline hydrogen evolution.