Self‐Promoted Hydroxyl Radical Releasing Magnetic Zn@Fe Particles

Abstract Semiconductor photocatalysts, such as TiO₂ and ZnO, have garnered significant attention for their ability to generate hydroxyl radicals, offering various practical applications. However, the reliance on UV light to facilitate electron‐hole separation for hydroxyl radical production poses limitations. In this study, a novel approach is presented utilizing Zn@Fe core/shell particles capable of generating hydroxyl radicals without external energy input. The generation process involves electron donation from Zn to O₂, resulting in the formation of radical species ^.O₂⁻/H₂O₂, followed by Fe‐catalyzed conversion of H₂O₂ into hydroxyl radicals through the Fenton reaction. The release of ^.OH imparts good antimicrobial and antiviral properties to the Zn@Fe particles. Furthermore, the inclusion of Fe confers magnetic properties to the material. This dual functionality holds promise for diverse potential applications for the Zn@Fe particles.