Electron Bridge Effect Induced by Oxygen‐Bridged Co on MnFe Core‐Shell Sphere for Boosting Catalytic Ozonation of 1,2‐Dichloroethane

ABSTRACT Catalytic ozonation technology occupies a pivotal position in the treatment of chlorinated volatile organic compounds (Cl‐VOCs) owing to its mild reaction conditions and exceptional efficiency. However, the efficacy of catalytic ozonation remains governed by the electronic properties and interfacial interactions of the catalyst. It constitutes a formidable challenge to improve chlorine poisoning resistance while preserving efficient electron transfer. In this study, cobalt (Co) was introduced into the MnFeO framework via in situ engineering to yield a MnFeO‐Co 0.02 (F) catalyst with Co–O–Mn/Fe. Through catalytic ozonation, the catalyst maintained 100% 1,2‐DCE conversion and over 95% mineralization within 50 h, outperforming reported catalysts. Mechanistic studies showed that Co–O–Mn/Fe modulated the local electronic environment, inducing differentiated shifts in the d‐ and p‐band centers and forming an interfacial electron bridge between the Mn‐rich shell and Fe‐rich core. This accelerated electron transfer reduced the energy barrier of the rate‐determining step in O 3 activation and promoted reactive oxygen species generation. Additionally, the Co–O–Mn/Fe stabilized the catalyst surface, facilitated chlorine species migration, and suppressed metal chloride formation, thereby enhancing chlorine resistance. This work provides insights into designing high‐performance catalysts with efficient O 3 activation and durability, promoting practical catalytic ozonation of Cl‐VOCs.