Facile construction of hierarchically porous carbon nanofibers modified by an FeCu/FeF 3 heterojunction for oxygen electrocatalysis in liquid and flexible Zn–air batteries

A novel strategy for the structural design and heterojunction material modification, which involves the FeCu/FeF 3 @HPCNFs as an efficient bi-functional oxygen electrocatalyst, is proposed, prepared and applied for high-performance ZABs.