Promoting oxygen reduction kinetics of single Fe sites for robust neutral Zn-air batteries via engineering synergistic Fe nanocluster as proton-feeding center

The synergistic effect of atomic FeN4 sites and neighboring Fe nanoclusters in the FeSA+NC@NMPC guarantees both efficient electron transfer for rapid intermediates conversion and fast water activations for protons supplying, which endows the FeSA+NC@NMPC with superior oxygen reduction reaction activities in the neutral electrolyte, thus achieving excellent recycling stability in neutral zinc-air batteries.