Identification of binuclear Co2N5 active sites for oxygen reduction reaction with more than one magnitude higher activity than single atom CoN4 site

A novel binuclear site, Co2N5 active site structure, has been rational designed and successfully synthesized for the first time. Electrochemical tests reveal that the contribution of this novel site to the whole ORR activity dominates among the various active sites and exhibits approximately 12 times higher intrinsic activity than the single atom CoN4 site.104