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A new iron-doped cobalt oxyhydroxide (Fe-CoOOH) electrocatalyst shows excellent performance for the oxygen evolution reaction (OER) in water electrolysis. This catalyst demonstrates high activity and remarkable stability, paving the way for efficient hydrogen production.

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Catalysis

Background:

  • Developing efficient electrocatalysts for the oxygen evolution reaction (OER) is crucial for water electrolysis.
  • Current OER catalysts face challenges in activity and long-term stability.

Purpose of the Study:

  • To synthesize a highly active and ultra-stable Fe-CoOOH electrocatalyst for the oxygen evolution reaction.
  • To investigate the surface reconstruction and doping mechanisms influencing catalyst performance.

Main Methods:

  • In situ solution combustion synthesis assisted by galvanic replacement reaction.
  • Electrochemical reconstruction of a CoFeOₓ pre-catalyst.
  • In/ex situ electrochemical analysis and physicochemical characterizations.
  • Theoretical calculations (DFT) to understand doping effects.

Main Results:

  • The synthesized Fe-CoOOH exhibits a semi-crystalline nanosheet structure with short-range ordering.
  • Achieved low overpotentials of 271 mV at 500 mA cm⁻² and 291 mV at 1000 mA cm⁻².
  • Demonstrated remarkable stability, maintaining performance at 1000 mA cm⁻² for over 700 hours.
  • Fe doping was confirmed to facilitate surface reconstruction and enhance OER activity and stability.

Conclusions:

  • Fe-CoOOH is a highly active and stable electrocatalyst for the oxygen evolution reaction.
  • Surface reconstruction and Fe doping are key factors for improved OER performance.
  • This study provides valuable insights into catalyst design for efficient water electrolysis.