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Highly-active oxygen evolution electrocatalyzed by a Fe-doped NiSe nanoflake array electrode.

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Developing a novel iron-doped nickel selenide (Fe-NiSe) electrode on iron-nickel foam significantly enhances hydrogen production via alkaline water electrolysis by boosting oxygen evolution reaction kinetics.

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Renewable Energy

Background:

  • Alkaline water electrolysis is key for hydrogen production.
  • The oxygen evolution reaction (OER) is a bottleneck due to sluggish kinetics.
  • There is a need for efficient, low-cost, and durable OER electrocatalysts.

Purpose of the Study:

  • To develop a highly active and robust electrocatalyst for the oxygen evolution reaction (OER).
  • To improve hydrogen production efficiency in alkaline media.

Main Methods:

  • In situ hydrothermal growth of an Fe-doped NiSe nanoflake array on macroporous FeNi foam.
  • Electrocatalytic testing of the Fe-NiSe/FeNi foam electrode in 1.0 M and 30 wt% KOH.

Main Results:

  • The Fe-NiSe/FeNi foam electrode exhibited low onset overpotential (200 mV) for OER.
  • Achieved high current densities (50 and 100 mA cm(-2)) at low overpotentials (245 and 264 mV in 1.0 M KOH).
  • Demonstrated remarkable robustness, driving 500 and 1000 mA cm(-2) at 246 and 263 mV overpotentials in 30 wt% KOH.

Conclusions:

  • The developed Fe-NiSe/FeNi foam is a highly active and robust electrocatalyst for OER.
  • This advancement significantly improves hydrogen production via alkaline water electrolysis.
  • The in situ growth method offers a promising route for scalable catalyst fabrication.