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CoNi2Se4 as an efficient bifunctional electrocatalyst for overall water splitting.

Bahareh Golrokh Amin1, Abdurazag T Swesi, Jahangir Masud

  • 1Department of Chemistry, Missouri University of Science & Technology, Rolla, MO 65409, USA. nathm@mst.edu.

Chemical Communications (Cambridge, England)
|April 29, 2017
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Summary

Cobalt nickel selenide (CoNi2Se4) exhibits outstanding bifunctional electrocatalytic activity for water splitting. This material achieves 10 mA cm-2 at 1.61 V, with a low oxygen evolution reaction overpotential of 160 mV.

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Catalysis

Background:

  • Efficient electrocatalysts are crucial for water splitting technologies.
  • Developing cost-effective and high-performance catalysts remains a challenge.

Purpose of the Study:

  • To investigate the electrocatalytic properties of CoNi2Se4 with a vacancy-ordered spinel structure.
  • To evaluate its potential for bifunctional water splitting in alkaline media.

Main Methods:

  • Synthesis of CoNi2Se4 with a vacancy-ordered spinel structure.
  • Electrochemical characterization of the catalyst for oxygen evolution reaction (OER) and hydrogen evolution reaction (HER).

Main Results:

  • CoNi2Se4 demonstrated excellent bifunctional electrocatalytic activity for water splitting.
  • Achieved a current density of 10 mA cm-2 at a cell voltage of 1.61 V.
  • Required an overpotential of only 160 mV for OER at 10 mA cm-2, among the lowest reported.

Conclusions:

  • CoNi2Se4 is a highly promising bifunctional electrocatalyst for alkaline water splitting.
  • Its low OER overpotential suggests significant potential for efficient hydrogen production.