Zeolitic Imidazolate Framework Film Derived CoFe‐N‐C Nanofoams for Reliable Zn‐air Batteries

Abstract The design of the efficient, flexible air electrode for enhancing Zn‐air batteries (ZABs) performance is vital in developing a new portable rechargeable power supply. Emerging research indicates that non‐precious metal materials have promising activity oxygen reduction/evolution alkaline conditions while constructing high‐performance and reliable still big challenge at present stage. In this work, bimetal doped zeolitic imidazolate framework (ZIF) film synthesized by fast current‐driven synthesis (FCDS) on thin carbon nanotube (CNTF). After carbonization 950 °C, CoFe‐N‐C nanofoam formed CNTF, resulting binder‐free, electrodes. It exhibits excellent stability toward reduction evolution. CoFe‐N‐C/CNTF‐based liquid‐state ZAB shows an output density 294 mW cm −2 . When applied solid‐state ZAB, battery high cycling stability.