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Ni/Fe Fluorides (Hydroxide) Nanocomposite as Efficient OER Catalyst.

Yanli Zhang1, Liangliang Dong1, Qiang Zhang1

  • 1School of Materials Science and Engineering, Shenyang University of Chemical Technology, Shenyang, Liaoning, 110142, China.

Chemphyschem : a European Journal of Chemical Physics and Physical Chemistry
|November 27, 2024
PubMed
Summary

This study introduces a novel Ni/Fe fluoride (hydroxide) nanocomposite catalyst for efficient oxygen evolution reactions (OER) in water splitting. The developed catalyst significantly reduces overpotential, paving the way for enhanced hydrogen production.

Keywords:
Ni4OHF7NiFeF5 ⋅ 2H2Ocatalystoxygen evolution reaction

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Catalysis

Background:

  • Efficient oxygen evolution reaction (OER) catalysts are critical for electrolytic water splitting and hydrogen production.
  • Reducing overpotential and enhancing catalyst stability are key challenges in this field.

Purpose of the Study:

  • To design and synthesize a novel Ni/Fe fluoride (hydroxide) nanocomposite OER catalyst.
  • To evaluate the catalytic performance and stability of the synthesized nanocomposite for water splitting.

Main Methods:

  • A two-step synthesis method was employed to prepare the Ni/Fe fluoride (hydroxide) nanocomposite.
  • Electrochemical characterization, including overpotential, Tafel slope, and stability tests, was performed.

Main Results:

  • The optimal Ni:Fe precursor ratio of 9:1 yielded a nanocomposite with nanoparticle morphology (~100 nm).
  • This optimal nanocomposite exhibited low OER overpotentials (208 mV at 10 mA/cm², 349 mV at 100 mA/cm²) and a Tafel slope of 53.1.
  • Outstanding stability was demonstrated for 10 hours at 100 mA/cm².

Conclusions:

  • The superior OER performance is attributed to the synergistic effects of multiple Ni and Fe active sites from Ni₄OHF₇, NiFeF₅·2H₂O, and Fe₁.₉F₄.₇₅·0.95H₂O phases.
  • The Ni/Fe fluoride (hydroxide) nanocomposite is a promising candidate for OER catalysts in electrolytic water splitting for hydrogen production.