An Fe-doped Co-oxide electrocatalyst synthesized through a post-modification method toward advanced water oxidation

Area of Science:

• Materials Science
• Electrochemistry
• Renewable Energy

Background:

• The global energy crisis necessitates clean energy solutions like electrocatalytic water splitting.
• The oxygen evolution reaction (OER) is a critical but kinetically slow step in water splitting, limiting overall efficiency.
• Developing efficient electrocatalysts is key to overcoming OER limitations.

Purpose of the Study:

• To synthesize and characterize a novel Fe-doped Co-oxide electrocatalyst for enhanced OER performance.
• To investigate the effect of iron doping on the structural and electronic properties of cobalt oxide.
• To evaluate the catalytic activity, efficiency, and stability of the prepared electrocatalyst.

Main Methods:

• Solvothermal synthesis to dope iron into a cobalt-containing hydroxide precursor.
• Electrochemical characterization including overpotential and Tafel slope measurements.
• BET surface area analysis and X-ray photoelectron spectroscopy (XPS) for material characterization.

Main Results:

• Successfully prepared Fe-doped Co-oxide electrocatalyst (Co3-xFexO4-0.01).
• Achieved low overpotential (294 mV at 10 mA cm-2) and Tafel slope (47.3 mV dec-1) for OER.
• Demonstrated excellent long-term stability with no significant performance degradation over 20 hours.
• Fe doping increased mesopores and oxygen bridges, facilitating active site construction and electronic regulation.

Conclusions:

• Fe doping in cobalt oxide is an effective strategy to boost OER performance.
• The developed Co3-xFexO4-0.01 catalyst shows promising potential for efficient and stable electrocatalytic water splitting.
• This research provides insights for designing advanced bimetallic electrocatalysts for clean energy applications.