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NiCoP-nanocubes-decorated CoSe

Xinyu Zheng1, Ying Peng1, Shengjie Xu1

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

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|June 9, 2023
PubMed
Summary

A novel 3D/2D electrocatalyst using nickel cobalt phosphide (NiCoP) and cobalt selenide (CoSe2) was developed for efficient oxygen evolution reaction (OER) in water electrolysis, showing superior performance.

Keywords:
Cobaltous selenideElectrocatalysisHeterostructureOxygen evolution reaction (OER)Synergistic effectTransition metal phosphides

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Catalysis

Background:

  • Effective catalysts for oxygen evolution reaction (OER) are crucial for water electrolysis but remain challenging to develop.
  • Existing catalysts often face limitations in cost, robustness, and efficiency.

Purpose of the Study:

  • To design and synthesize a novel 3D/2D electrocatalyst for efficient OER.
  • To investigate the synergistic effects between NiCoP and CoSe2 for enhanced catalytic activity.

Main Methods:

  • A combined selenylation, co-precipitation, and phosphorization method was employed.
  • The electrocatalyst, NiCoP-nanocubes-decorated CoSe2 nanowires arrays (NiCoP-CoSe2-2), was characterized.
  • Density functional theory (DFT) calculations were used to understand the mechanism.

Main Results:

  • The NiCoP-CoSe2-2 electrocatalyst demonstrated a low overpotential (202 mV at 10 mA cm-2) and a small Tafel slope (55.6 mV dec-1).
  • Performance surpassed most reported CoSe2 and NiCoP-based heterogeneous electrocatalysts.
  • Interfacial coupling between CoSe2 and NiCoP enhanced charge transfer, reaction kinetics, and electronic structure.

Conclusions:

  • The developed NiCoP-CoSe2-2 catalyst offers superior OER performance in alkaline media.
  • Interfacial synergy is key to optimizing transition metal phosphide/selenide catalysts.
  • This work provides insights for developing advanced electrocatalysts for energy storage and conversion.