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1、CARBON48(2010)3825–3833availableatwww.sciencedirect.comjournalhomepage:www.elsevier.com/locate/carbonFastandreversiblesurfaceredoxreactionofgrapheneMnO2compositesassupercapacitorelectrodesaa,*ababJunYan,ZhuangjunFan,TongWei,WeizhongQian,MilinZhang,FeiWeiaKeyL
2、aboratoryofSuperlightMaterialsandSurfaceTechnology,MinistryofEducation,CollegeofMaterialScienceandChemicalEngineering,HarbinEngineeringUniversity,Harbin150001,ChinabBeijingKeyLaboratoryofGreenChemicalReactionEngineeringandTechnology,DepartmentofChemicalEngine
3、ering,TsinghuaUniversity,Beijing100084,ChinaARTICLEINFOABSTRACTArticlehistory:WepresentaquickandeasymethodtosynthesizegrapheneMnO2compositesthroughReceived4February2010theself-limitingdepositionofnanoscaleMnO2onthesurfaceofgrapheneundermicro-Accepted21June201
4、0waveirradiation.ThesenanostructuredgrapheneMnO2hybridmaterialsareusedforAvailableonline25June2010investigationofelectrochemicalbehaviors.GrapheneMnO2composite(78wt.%MnO2)dis-1111playsthespecificcapacitanceashighas310Fgat2mVs(even228Fgat500mVs),1whichisal
5、mostthreetimeshigherthanthatofpuregraphene(104Fg)andbirnessite-1typeMnO2(103Fg).Interestingly,thecapacitanceretentionratioishighlykeptovera11widerangeofscanrates(88%at100mVsand74%at500mVs).Theimprovedhigh-rateelectrochemicalperformancemaybeattributedtothei
6、ncreasedelectrodeconductiv-ityinthepresenceofgraphenenetwork,theincreasedeffectiveinterfacialareabetweenMnO2andtheelectrolyte,aswellasthecontactareabetweenMnO2andgraphene.Ó2010ElsevierLtd.Allrightsreserved.1.Introductionnanometersthick)oftendeliververyhighspe
7、cificcapaci-1tancesrangingfrom700to1380Fg[10].WhenpreparedSupercapacitors,ascharge-storagedevicesexhibitinghigh-asmicrometer-thickdepositsorincompositeelectrodeformspowerdensity,excellentreversibilityandcycleability,haveat-containingcarbonandbinders,however,M
8、nO2usuallydeliv-1tractedtremendousattentionduetothegrowingdemandforersaspecificcapacitanceofonly150250Fgduetothepoorpowersystemsdeliveringsignificantenergyinthehigh-electricalconductivityo
