The operation active sites of O 2 reduction to H 2 O 2 over ZnO

ZnO@ZnO 2 shows ∼100% 2e − ORR selectivity in neutral media and a rate of 5.47 mol g cat −1 h −1 and an FE of 95.5% in bulk H 2 O 2 production. The in situ growth of ZnO 2 on ZnO restructures the operation active sites to facilitate a superior 2e − ORR activity.