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Ru-doping modulated cobalt phosphide nanoarrays as efficient electrocatalyst for hydrogen evolution rection.

Yu Liu1, Shengjie Xu1, Xinyu Zheng1

  • 1School of Chemistry and Chemical Engineering, Jiangsu University, Zhenjiang 212013, China.

Journal of Colloid and Interface Science
|June 23, 2022
PubMed
Summary
This summary is machine-generated.

Researchers developed ruthenium-doped cobalt phosphide nanoarrays for efficient hydrogen production via electrochemical water splitting. This catalyst accelerates the hydrogen evolution reaction (HER) in alkaline solutions, offering a promising pathway for clean energy.

Keywords:
ElectrocatalysisHeteroatom dopingHydron evolution reactionMetal phosphide

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Catalysis

Background:

  • Electrochemical water splitting is a key technology for hydrogen (H2) production.
  • The hydrogen evolution reaction (HER) faces challenges in alkaline media due to insufficient active sites and slow kinetics.
  • Developing efficient electrocatalysts is crucial for advancing HER.

Purpose of the Study:

  • To design and synthesize a novel electrocatalyst for enhanced HER performance in alkaline conditions.
  • To investigate the effect of ruthenium (Ru) doping on cobalt phosphide (CoP) for HER.
  • To understand the mechanism behind the improved catalytic activity.

Main Methods:

  • Fabrication of leaf-like cobalt phosphide nanoarrays on carbon cloth via a MOF-derived route.
  • Doping cobalt phosphide with ruthenium (Ru-CoP NAs).
  • Electrochemical characterization of HER performance in 1 M KOH.
  • Density functional theory (DFT) calculations to study electronic structure and adsorption energies.

Main Results:

  • The optimized Ru-CoP-2.5 NAs demonstrated excellent HER activity with a low overpotential of 52 mV at 10 mA cm-2.
  • A low Tafel slope of 39.7 mV dec-1 was achieved, indicating efficient reaction kinetics.
  • Hierarchical structure facilitated electrolyte diffusion and gas bubble release.
  • DFT calculations confirmed that Ru doping optimizes H* adsorption and accelerates reaction kinetics.

Conclusions:

  • Ruthenium-doped cobalt phosphide nanoarrays are highly effective electrocatalysts for HER in alkaline media.
  • The hierarchical structure and electronic modulation by Ru doping significantly enhance catalytic activity.
  • This study offers valuable insights for designing advanced metal phosphide electrocatalysts for hydrogen production.