Hollow polyhedral Fe single-atom catalysts with S/N dual coordination boosting oxygen and iodide redox for high-efficiency zinc–air/iodide hybrid batteries

A hollow polyhedral Fe SAC with a dual S/N coordinated Fe–N 3 S 1 structure is designed to simultaneously catalyze oxygen and iodide redox reactions in zinc–air–iodide hybrid batteries to boost energy efficiency and cycling stability.