Densely accessible Fe/Co–Nx dual-atom site coupled core–shell Co3Fe7@C as an efficient bifunctional oxygen electrocatalyst for rechargeable zinc–air batteries

The symmetric electronic structure of an Fe single-atom site catalyst was effectively regulated by incorporating Co–N x sites and core–shell Co 3 Fe 7 @C nanoparticles, resulting in high performance towards the ORR and Zn–air batteries.