MOF-Derived CoSe₂@NiFeOOH Arrays for Efficient Oxygen Evolution Reaction

Area of Science:

• Electrochemistry
• Materials Science
• Catalysis

Background:

• Water electrolysis is crucial for green hydrogen production.
• Efficient oxygen evolution reaction (OER) catalysts are vital for water electrolysis.
• Developing stable and active OER catalysts is an ongoing research challenge.

Purpose of the Study:

• To introduce a novel and highly effective catalyst for the oxygen evolution reaction (OER).
• To demonstrate a new fabrication method for advanced OER catalysts.
• To evaluate the catalytic performance and stability of the developed material.

Main Methods:

• Fabrication of CoSe2@NiFeOOH arrays on nickel foam (NF) via a two-step process.
• Selenidation of a cobalt-based porous metal-organic framework.
• Electrochemical deposition of NiFeOOH on the CoSe2 precursor.
• Electrochemical testing in an alkaline electrolyte to assess OER performance.

Main Results:

• The CoSe2@NiFeOOH/NF catalyst exhibited outstanding OER activity.
• Achieved a low overpotential of 254 mV at 100 mA cm⁻².
• Demonstrated a small Tafel slope of 73 mV dec⁻¹ and excellent long-term stability.

Conclusions:

• The CoSe2@NiFeOOH/NF catalyst is a highly promising material for efficient OER.
• Synergistic effects between CoSe2 and NiFeOOH, along with high conductivity, contribute to its performance.
• The study presents an effective strategy for fabricating high-performance OER catalysts.