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Polyaniline–derived metal–free hollow nitrogen–doped carbon microspheres as an efficient electrocatalyst for supercapacitors and oxygen reduction

Chemical EngineeringSupercapacitorsEngineeringNitrogen–doped Carbon MicrospheresEnergy StorageSupercapacitorEfficient ElectrocatalystCatalysisChemistryOxygen ReductionElectrochemical Double Layer CapacitorElectrochemistry