Manipulating the Second Coordination Shell of Single-Atom Fe for Enhanced Fenton Reaction

Area of Science:

• Catalysis
• Materials Science
• Electrochemistry

Background:

• Conventional Fenton catalysts rely on oxidizable metals, leading to irreversible oxidation and reduced catalyst lifespan.
• Efficient regeneration of active iron species (Fe2+) is crucial for sustained catalytic activity in Fenton-like reactions.

Purpose of the Study:

• To engineer a stable single-atom iron catalyst with enhanced longevity by modifying its second coordination shell.
• To utilize hydrogen peroxide (H2O2) as an electron source for efficient Fe2+ regeneration.
• To investigate the catalytic mechanism of the engineered Fe1/B-graphene catalyst.

Main Methods:

• Synthesis of a single-atom iron catalyst doped with boron on a graphene support (Fe1/B-graphene).
• Experimental characterization of the catalyst's structure and performance.
• Theoretical calculations (e.g., DFT) to elucidate the reaction mechanism and electron transfer pathways.

Main Results:

• The Fe-O-B motif acts as a micro galvanic cell, facilitating electron transfer.
• Boron doping enables efficient H2O2 oxidation at lower activation energy, regenerating Fe2+ at the Fe1 sites.
• The engineered catalyst demonstrates enhanced stability and catalytic performance compared to conventional methods.

Conclusions:

• Precise regulation of the second coordination shell is a viable strategy for designing robust Fenton catalysts.
• The Fe1/B-graphene catalyst offers a promising approach for sustainable and efficient catalytic applications.
• Tailoring the outer coordination environment of single-atom catalysts can significantly enhance their performance.