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1、ResearchArticlewww.acsami.orgGrapheneQuantumDotHybridsasEfficientMetal-FreeElectrocatalystfortheOxygenReductionReactionYongLiuandPeiyiWu*StateKeyLaboratoryofMolecularEngineeringofPolymers,DepartmentofMacromolecularScience,andLaboratoryofAdvancedMaterials,Fud
2、anUniversity,Shanghai200433,People’sRepublicofChina*SSupportingInformationABSTRACT:Thedopingofheteroatomsintographenequantumdotnanostructuresprovidesanefficientwaytotunetheelectronicstructuresandmakemoreactivesitesforelectro-catalysis,photovoltaic,orlightemi
3、ttingapplications.Otherthanthemodificationofchemicalcomposition,novelarchitectureisverydesirabletoenrichtheresearchareaandprovidesawiderangeofchoicesforthediverseapplications.Herein,weshowanovellotusseedpodsurface-likepatternofzero-dimension(0D)seed-likeN-G
4、ODsofca.3nmembeddedonthesurfaceofatwo-dimension(2D)N-GQDsheetofca.35nm.Itisdemonstratedthatdifferentphotoluminescence(PL)couldbetunedeasily,andthenovelmultidimensionalstructuredisplaysexcellentperformancetowardoxygenreductionreactioninalkalinesolutions.Thus
5、,thefabricatedN-GQDhybridsshowbrightperspectiveinbiomedicalimaging,biosensors,andconversionandstorageofenergy.KEYWORDS:graphenequantumdots,architecture,photoluminescence,oxygenreductionreaction■INTRODUCTIONontheGQDsurfacehavebeenwidelystudiedexperimentally
6、17,18andtheoreticallyoverthelastseveralyears,thesignificantThedevelopmentoflow-toxic,eco-friendly,andchemicallyinertfluorescentmaterials1isintegraltotheprogressoftechnologicalpotentialsofGQDshavejuststartedto19−21emergingfieldssuchasnanobiomedicine,2biotechno
7、logy,3fuelTherefore,toexplorethepotentialapplicationcells,4andoptoelectronics.5Inthisaspect,graphenequantumanddiscovernewphenomenaandunexpectedpropertiesofdots(GQDs),6arisingstarinthegraphenefamily,haveGQDs,onepossiblerouteistomodulateitspropertyby22recent
8、lybeensubjectedtoextensiveresearchinmaterialschemicaldopingandmodification.Quetal.electrochemicallyscienceandengineering.Incontrasttoquasi-sphericalcarbonpreparedN-functionedGQDswithN/Catomicratioofca.dotswith
