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1、CTAB-PromotedPrussianBlue-ModifiedElectrodeandItsCationTransportCharacteristicsforK+,Na+,Li+,andNH4+IonsR.Vittal,*,²,§Kang-JinKim,³H.Gomathi,²andV.Yegnaraman²DepartmentofChemistry,KoreaUniVersity,Seoul,136-713,Korea,andCentralElectrochemicalResearchInstitute,Karaikudi630006,IndiaR
2、eceiVed:June27,2007;InFinalForm:October12,2007APrussianblue(PB)filmwasdepositedonaglassycarbon(GC)electrodebycyclicvoltammetryinthepresenceofthecationicsurfactantcetyltrimethylammoniumbromide(CTAB).Theelectrodethusformedshowed4-foldenhancementsinredoxcurrentandchargevaluesinpureKC
3、lelectrolyteaswellasgreaterstabilitythananelectrodepreparedintheabsenceofCTAB.ThisimprovedperformanceofaPB+CTABelectrodeversusaPBelectrodewasfurtherdemonstratedusingSEM,XRD,andelectrochemicalimpedancespectroscopy(EIS)measurements.Acomparativestudywasundertakenonthecationtransportc
4、haracteristicsofPBandPB+CTABelectrodesforNa+,Li+,andNH+4ions.WeobtainedaCVpatternforaCTAB-promotedPBfilm,whichshowedidealNernstianbehavioratallscanratesfrom5to140mVs-1.ConditionsfortheformationandpreservationoftheseidealandstablePBfilmsarediscussed.Possiblemechanismsforthebenefici
5、aleffectsofCTABareproposed.1.Introductionplicationsarealsovalidforelectrocatalyticapplications.ThebeneficialroleofCTABinthemodificationofabareelectrodePrussianblue(PB)(iron(III)hexacyanoferrate(II))isthewithPBfilmisemphasized.TheimprovedPB-modifiedprototypetransitionmetalhexacyani
6、de;itwasthefirstcoordina-1electrodeisexpectedtofindapplicationsinotherbranchesoftioncompoundreportedinthescientificliterature.Moreover,electrochemistry.WedemonstrateinthispapersymmetricredoxPBhasattractedtheinterestofelectrochemistsduetoitspeaksforaPB+CTABfilm,whichshowedidealNern
7、stianapplications,asathinfilmonabareelectrode,forthebehavioratallscanratesfrom0.005to0.14Vs-1.Webelieveelectroanalysisofvarioussubstances(e.g.,alkaliions,2potas-siumion,3-5ammonium,6hydrogenperoxide,7thiol,8oxidasethisrepresentsanidealCVpatternforaPB-modifiedelectrode,enzyme,9lact
8、icacid,10ascorbicacid,11electroin
