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Updated: Dec 11, 2025

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Morphologically controlled cobalt oxide nanoparticles for efficient oxygen evolution reaction.

Bappi Paul1, Piyali Bhanja2, Sachin Sharma3

  • 1Department of Pure and Applied Sciences, University of Tsukuba, Tsukuba, Ibaraki 305-8573, Japan; Catalytic Conversion & Processes Division, CSIR-Indian Institute of Petroleum, Dehradun 248005, India.

Journal of Colloid and Interface Science
|August 23, 2020
PubMed
Summary

Researchers synthesized tunable morphology spinel cobalt oxides (Co3O4) for efficient electrochemical water oxidation. The 24-hour synthesized catalyst demonstrated superior oxygen evolution reaction activity and stability.

Keywords:
ElectrocatalystNanocubeNanosphereOxygen evolution reactionSpinel Co(3)O(4)

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Nanotechnology

Background:

  • Electrochemical water oxidation is crucial for addressing energy and environmental challenges.
  • Morphological control of nanomaterials is key to designing efficient electrocatalysts for the oxygen evolution reaction (OER).

Purpose of the Study:

  • To demonstrate a facile and cost-effective synthesis of spinel cobalt oxides (Co3O4) with tunable morphology.
  • To explore the catalytic activity of Co3O4 nanomaterials with varying morphologies towards OER.

Main Methods:

  • One-pot hydrothermal synthesis of Co3O4 nanomaterials.
  • Systematic variation of reaction time to control morphology (nanospheres, hexagon, nanocubes).
  • Electrocatalytic activity testing for OER in 1.0 M KOH solution.

Main Results:

  • Co3O4 nanoparticles synthesized in 24 hours (Co3O4-24h) exhibited the lowest overpotential (296 mV at 10 mA cm-2) for OER.
  • The Co3O4-24h catalyst showed superior performance compared to catalysts synthesized for 6h and 12h, and commercial IrO2.
  • The Co3O4-24h sample demonstrated excellent electrochemical stability for up to 25 hours.

Conclusions:

  • Facile synthesis of Co3O4 with tunable morphology is achievable via a one-pot hydrothermal method.
  • Morphology significantly influences the OER catalytic activity of Co3O4 nanomaterials.
  • The 24-hour synthesized Co3O4 nanoparticles represent a promising electrocatalyst for efficient and stable electrochemical water splitting.