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An Fe-V@NiO heterostructure electrocatalyst towards the oxygen evolution reaction.

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A new nonprecious electrocatalyst, Fe-V@NiO/NF, demonstrates excellent performance for the oxygen evolution reaction (OER). In situ oxidation significantly enhances its activity and stability, making it a promising material for energy applications.

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Catalysis

Background:

  • Developing efficient, Earth-abundant electrocatalysts for the oxygen evolution reaction (OER) is crucial for energy technologies.
  • Nonprecious metal-based catalysts are highly sought after to overcome the limitations of noble metal catalysts.

Purpose of the Study:

  • To design and synthesize a novel, nonprecious electrocatalyst for enhanced OER performance.
  • To investigate the effect of in situ oxidation on the electrocatalytic activity and stability of the proposed material.

Main Methods:

  • Facile synthesis of ultrathin NiO nanosheets decorated with Fe-V nanoparticles on nickel foam (Fe-V@NiO/NF).
  • Electrochemical characterization of the Fe-V@NiO/NF catalyst for OER.
  • In situ oxidation via galvanostatic electrolysis in an alkaline solution.

Main Results:

  • The Fe-V@NiO/NF heterostructure exhibited excellent electrocatalytic activity for OER.
  • In situ oxidation significantly boosted OER performance, achieving a current density of 50 mA cm⁻² at a low overpotential of 271.1 mV after 10 h.
  • Oxidation led to the formation of active α-FeOOH and amorphous (oxy)-hydroxide layers, reducing charge transfer resistance.

Conclusions:

  • The developed Fe-V@NiO/NF catalyst is a highly effective and stable electrocatalyst for OER.
  • In situ oxidation is a viable strategy to optimize the performance of nonprecious metal electrocatalysts.
  • This work provides a promising pathway for designing advanced electrocatalysts for energy conversion applications.