Easy conversion perovskite fluorides KCo_1-FeF₃ for efficient oxygen evolution reaction.

Area of Science:

• Electrochemistry
• Materials Science
• Catalysis

Background:

• The oxygen evolution reaction (OER) is critical for renewable energy technologies.
• Developing efficient and cost-effective OER catalysts is a significant challenge.
• Perovskite materials offer tunable properties for catalytic applications.

Purpose of the Study:

• To synthesize and characterize a novel Co-Fe perovskite fluoride catalyst.
• To investigate the catalytic performance of the material for the oxygen evolution reaction.
• To elucidate the role of fluoride in the catalytic mechanism.

Main Methods:

• Synthesis of Co-Fe perovskite fluoride.
• Electrochemical characterization, including cyclic voltammetry and chronoamperometry.
• In situ Raman spectroscopy to study catalyst evolution.

Main Results:

• The Co-Fe perovskite fluoride exhibits excellent OER activity, achieving 10 mA cm^-2 at an overpotential of 118 mV in 1 M KOH.
• In situ Raman spectroscopy revealed that fluoride promotes the formation of highly active (Co³⁺Fe³⁺)OOH species.
• The catalyst demonstrates good stability and efficiency for the oxygen evolution reaction.

Conclusions:

• Co-Fe perovskite fluoride is a highly efficient catalyst for the oxygen evolution reaction.
• Fluoride plays a crucial role in the catalyst's reconstruction and enhanced activity.
• This study provides insights into fluoride-mediated OER catalysis for future catalyst design.