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Efficient tri-metallic oxides NiCo2O4/CuO for the oxygen evolution reaction.

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This study presents earth-abundant NiCo2O4/CuO composites for oxygen evolution reaction (OER) catalysis. Sample 2 demonstrated excellent durability and efficiency for water splitting applications.

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Catalysis

Background:

  • Developing efficient and stable electrocatalysts for the oxygen evolution reaction (OER) is crucial for renewable energy technologies.
  • Nonprecious, earth-abundant materials are highly sought after to replace expensive noble metal catalysts.
  • Nickel-cobalt oxides and copper oxides are promising candidates for OER catalysis.

Purpose of the Study:

  • To synthesize and characterize NiCo2O4/CuO nanocomposites for efficient OER in alkaline media.
  • To investigate the effect of CuO addition on the morphology and catalytic performance of NiCo2O4.
  • To evaluate the stability and electrochemical properties of the developed composite materials.

Main Methods:

  • A low-temperature aqueous chemical growth method was employed for nanocomposite synthesis.
  • NiCo2O4/CuO composites were loaded onto glassy carbon electrodes via drop casting.
  • Electrochemical techniques including cyclic voltammetry, linear sweep voltammetry, and electrochemical impedance spectroscopy (EIS) were utilized.

Main Results:

  • The addition of CuO altered the nanostructure from nanowires to porous structures.
  • The NiCo2O4/CuO composite (sample 2) exhibited a low OER onset potential of 1.46 V vs. RHE.
  • Sample 2 achieved a current density of 10 mA cm-2 at an overpotential of 230 mV and showed 35 hours of durability.
  • EIS revealed a low charge transfer resistance of 77.46 ohms for sample 2, indicating favorable OER kinetics.

Conclusions:

  • NiCo2O4/CuO nanocomposites are effective, stable, and environmentally friendly electrocatalysts for OER.
  • The optimized composite (sample 2) shows significant potential for applications in water splitting and energy storage.
  • The facile synthesis method and excellent performance encourage further exploration of these materials.