Improving the Oxygen Evolution Reaction on Fe₃O₄(001) with Single-Atom Catalysts

Area of Science:

• Materials Science
• Catalysis
• Electrochemistry

Background:

• The oxygen evolution reaction (OER) is crucial for water electrolysis and hydrogen production.
• Doping magnetite (Fe3O4) surfaces with transition metals is a strategy to enhance OER catalytic performance.
• The Fe3O4(001) surface is explored as a support for single-atom catalysts.

Purpose of the Study:

• To investigate transition-metal-doped Fe3O4(001) surfaces as single-atom catalysts for the OER.
• To evaluate the structural, electronic, magnetic, and catalytic properties of Ti, Co, Ni, and Cu dopants.
• To identify the most promising dopant for improved OER performance.

Main Methods:

• Computational modeling of transition-metal atoms (Ti, Co, Ni, Cu) on the Fe3O4(001) surface.
• HSE06 hybrid functional calculations for structural, electronic, and magnetic property analysis.
• Assessment of OER catalytic performance using the computational hydrogen electrode model.

Main Results:

• Cobalt-doped Fe3O4(001) systems exhibited the most promising electrocatalytic activity for the OER.
• Calculated overpotential values for cobalt-doped systems were approximately 0.35 V.
• These values are consistent with experimentally reported overpotentials for mixed Co/Fe oxides (0.2–0.5 V).

Conclusions:

• Cobalt doping of the Fe3O4(001) surface significantly enhances OER catalytic performance.
• The findings suggest that Co-doped Fe3O4 is a viable candidate for efficient electrocatalysts in water electrolysis.
• This study provides a computational basis for designing advanced single-atom catalysts for hydrogen production.