Optimizing electronic synergy of atomically dispersed dual-metal Ni–N4 and Fe–N4 sites with adjacent Fe nanoclusters for high-efficiency oxygen electrocatalysis

The electronic synergy of Fe nanoclusters and Ni/Fe–N 4 single-atomic sites optimizes the adsorption/desorption of oxygenated intermediates and reduces the energy barrier of the oxygen electrocatalysis, boosting the Zn–air batteries performance.