Iron-Cobalt Phosphomolybdate with High Electrocatalytic Activity for Oxygen Evolution Reaction

Area of Science:

• Materials Science
• Electrochemistry
• Catalysis

Background:

• The oxygen evolution reaction (OER) is crucial for energy conversion technologies.
• Developing efficient and stable electrocatalysts for OER is a significant challenge.
• Existing catalysts like RuO₂ have limitations in cost and stability.

Purpose of the Study:

• To synthesize and characterize novel iron-cobalt phosphomolybdate (FeCoPM₁₂) nanoparticles.
• To evaluate the electrocatalytic activity and stability of FeCoPM₁₂ for OER.
• To understand the structural properties contributing to the enhanced OER performance.

Main Methods:

• Coprecipitation route for nanoparticle synthesis.
• Electrochemical characterization including overpotential and Tafel slope measurements.
• Long-term stability testing at a constant potential.

Main Results:

• FeCoPM₁₂ nanoparticles exhibited superior OER activity compared to iron-cobalt hydroxide and RuO₂.
• Achieved a low overpotential of 258 mV at 10 mA cm^-2 and a Tafel slope of 33 mV dec^-1.
• Demonstrated excellent stability with only an 8.3% degradation after 10 hours at 1.52 V.

Conclusions:

• FeCoPM₁₂ nanoparticles are highly efficient and stable electrocatalysts for OER in alkaline media.
• The small porous structure and high electrochemical stability of FeCoPM₁₂ contribute to its catalytic performance.
• This material offers a promising alternative for OER applications.