Multishelled FeCo@FeCoP@C Hollow Spheres as Highly Efficient Hydrogen Evolution Catalysts

Area of Science:

• Materials Science
• Electrochemistry
• Catalysis

Background:

• Nonprecious metal electrocatalysts are crucial for sustainable hydrogen generation via the hydrogen evolution reaction (HER).
• Developing efficient and stable HER electrocatalysts remains a significant challenge in clean energy technologies.

Purpose of the Study:

• To synthesize and characterize novel multishelled FeCo@FeCoP@C hollow spheres as advanced HER electrocatalysts.
• To investigate the structure-activity relationship and understand the catalytic mechanism.

Main Methods:

• Synthesis of FeCo@FeCoP@C hollow spheres using a carbonization and phosphorization strategy on a FeCo-MIL-88 metal-organic framework precursor.
• Electrochemical characterization of HER performance in acidic media.
• Density functional theory (DFT) calculations to elucidate hydrogen adsorption energies.

Main Results:

• The FeCo@FeCoP@C catalyst exhibited excellent HER activity with a low overpotential of 65 mV at 10 mA cm⁻².
• The multishelled hollow sphere structure and FeCoP composition provided superior catalytic performance and stability.
• DFT calculations confirmed optimal hydrogen absorption energy for FeCoP compared to FeP and CoP.

Conclusions:

• The synthesized FeCo@FeCoP@C multishelled hollow spheres are highly effective nonprecious metal electrocatalysts for HER.
• The unique morphology and composition contribute to enhanced catalytic activity and durability.
• This work presents a promising strategy for designing advanced catalysts for hydrogen production.