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1、SubscriberaccessprovidedbyUniv.ofTexasLibrariesLetterGraphene-BasedUltracapacitorsMerylD.Stoller,SungjinPark,YanwuZhu,JinhoAn,andRodneyS.RuoffNanoLett.,2008,8(10),3498-3502•DOI:10.1021/nl802558y•PublicationDate(Web):13September2008Downloadedfromhttp://pubs.acs.orgonJanuary15,2009More
2、AboutThisArticleAdditionalresourcesandfeaturesassociatedwiththisarticleareavailablewithintheHTMLversion:•SupportingInformation•Accesstohighresolutionfigures•Linkstoarticlesandcontentrelatedtothisarticle•Copyrightpermissiontoreproducefiguresand/ortextfromthisarticleNanoLettersispublis
3、hedbytheAmericanChemicalSociety.1155SixteenthStreetN.W.,Washington,DC20036NANOLETTERSGraphene-BasedUltracapacitors2008Vol.8,No.103498-3502MerylD.Stoller,SungjinPark,YanwuZhu,JinhoAn,andRodneyS.Ruoff*DepartmentofMechanicalEngineeringandTexasMaterialsInstitute,UniVersityofTexasatAustin
4、,OneUniVersityStationC2200,Austin,Texas,78712-0292ReceivedAugust22,2008ABSTRACTThesurfaceareaofasinglegraphenesheetis2630m2/g,substantiallyhigherthanvaluesderivedfromBETsurfaceareameasurementsofactivatedcarbonsusedincurrentelectrochemicaldoublelayercapacitors.Ourgrouphaspioneeredanew
5、carbonmaterialthatwecallchemicallymodifiedgraphene(CMG).CMGmaterialsaremadefrom1-atomthicksheetsofcarbon,functionalizedasneeded,andherewedemonstrateinanultracapacitorcelltheirperformance.Specificcapacitancesof135and99F/ginaqueousandorganicelectrolytes,respectively,havebeenmeasured.Inad
6、dition,highelectricalconductivitygivesthesematerialsconsistentlygoodperformanceoverawiderangeofvoltagescanrates.Theseencouragingresultsillustratetheexcitingpotentialforhighperformance,electricalenergystoragedevicesbasedonthisnewclassofcarbonmaterial.Ultracapacitorsbasedonelectrochemi
7、caldoublelayerca-asenunciatedbytheU.S.DepartmentofEnergy,forpacitance(EDLC)areelectricalenergystoragedevicesthatincreasingtheenergydensityofultracapacitorstobecloserstoreandreleaseenergybynanoscopicchargeseparationattotheenergydensityofbatteries.4InadditiontotheEDLCstheelectrochemica
8、linterfacebe
