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N-doped hollow carbon spheres intercalated graphene film induced macroporous frameworks for ultrahigh volumetric energy density supercapacitor

Materials ScienceSupercapacitorsEngineeringPorous CarbonCarbon-based MaterialNanomaterialsGraphene FilmGrapheneEnergy StorageSupercapacitorMacroporous FrameworksChemistryElectrochemical Double Layer Capacitor