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Phosphate ion functionalized CoP nanowire arrays for efficient alkaline hydrogen evolution.

Dongdong Zhu1, Liang Wang, Man Qiao

  • 1School of Chemistry and Materials Science, Nanjing University of Information Science and Technology, Nanjing, 210044, China. dd.zhu@nuist.edu.cn.

Chemical Communications (Cambridge, England)
|May 29, 2020
PubMed
Summary

Phosphate ion functionalization of cobalt phosphide (CoP) nanowires enhances alkaline hydrogen evolution. This method provides high activity and stability for efficient hydrogen production.

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Catalysis

Background:

  • Transition metal phosphides are promising electrocatalysts for hydrogen evolution.
  • Improving the activity and stability of these catalysts in alkaline media is crucial for practical applications.

Purpose of the Study:

  • To investigate the effect of phosphate ion functionalization on cobalt phosphide (CoP) nanowire arrays for hydrogen evolution reaction (HER).
  • To evaluate the electrocatalytic performance and stability of the functionalized CoP nanowires in an alkaline environment.

Main Methods:

  • Synthesis of CoP nanowire arrays.
  • Phosphate ion functionalization of CoP nanowires.
  • Electrochemical characterization using techniques like linear sweep voltammetry and electrochemical impedance spectroscopy.

Main Results:

  • Phosphate ion functionalized CoP nanowire arrays demonstrated high HER activity, requiring an overpotential of 112 mV to achieve a current density of 100 mA cm-2.
  • The catalyst exhibited a low Tafel slope of 49 mV dec-1, indicating efficient hydrogen evolution kinetics.
  • The functionalized CoP nanowires showed outstanding stability in 1.0 M KOH solution over extended operation.

Conclusions:

  • Phosphate ion functionalization is an effective strategy to boost the alkaline hydrogen evolution performance of transition metal phosphides.
  • The developed CoP nanowire arrays show great potential as efficient and stable electrocatalysts for hydrogen production in alkaline media.