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Oxygen-vacancy-rich CoFe/CoFe2O4 embedded in N-doped hollow carbon spheres as a highly efficient bifunctional electrocatalyst for Zn–air batteries

Materials ScienceOxygen Reduction ReactionChemical EngineeringEngineeringBattery Electrode MaterialsZn–air BatteriesAdvanced Electrode MaterialEnergy StorageElectrochemical Energy StorageBatteriesChemistrySolid-state BatteryN-doped Hollow CarbonOxygen-vacancy-rich Cofe/cofe2o4Electrochemistry