Ters sp2 C-F Bağları Geri Dönüştürülebilir Oksijen-Peroksit Elektrokatalizini Sağlar

Özet (abstract)

ABSTRACT Rechargeable zinc‐air batteries are fundamentally limited by the sluggishness of four‐electron (4e − ) oxygen electrocatalysis and by bifunctional catalysts that rarely combine high activity with long‐term durability, resulting in substantial polarization and poor reversibility. Replacing this chemistry with O 2 –H 2 O 2 interconversion offers a compelling alternative, because two‐electron (2e − ) oxygen electrocatalysis features intrinsically more reversible pathways and faster kinetics. Herein, fluorine‐doped graphene is established as a programmable electrocatalytic platform for O 2 ‐H 2 O 2 interconversion, where tailored sp 2 ‐C─F bonding acts as a precise electronic lever to regulate OOH* intermediate binding and thereby steer O 2 –H 2 O 2 redox selectivity and kinetics. By controlling fluorine incorporation, the local electronic environment of graphene is delicately engineered without sacrificing electrical conductivity. The optimized catalyst exhibits outstanding bifunctional activity for 2e − oxygen reduction reaction (2e – ‐ORR) and peroxide oxidation reaction (POR), translating into rechargeable zinc‐based batteries with high power output and robust long‐term durability. Mechanistic studies reveal that sp 2 ‐C─F bonding induces localized electrostatic polarization at neighboring carbon sites, selectively stabilizing OOH* intermediates, lowering the kinetic barrier for 2e – ‐ORR, and concurrently facilitating POR while minimizing parasitic reactions. These findings demonstrate a fundamental structure‐property principle linking fluorine‐induced polarization with O 2 –H 2 O 2 redox kinetics, and position fluorinated carbon frameworks as a versatile foundation for next‐generation reversible energy storage.

Yazarların özeti; kaynağından alınmıştır. Angewandte Chemie International Edition, 2026 · DOI ↗