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1、ElectrochimicaActa108(2013)203–210ContentslistsavailableatScienceDirectElectrochimicaActajournalhomepage:www.elsevier.com/locate/electactaEnhancedphotoelectrocatalyticperformancefordegradationofdiclofenacandmechanismwithTiO2nano-particlesdecoratedTiO2nano-tubesarraysphotoelectrodeXiuwen∗Cheng,Hu
2、ilingLiu,QinghuaChen,JunjingLi,PuWangStateKeyLaboratoryofUrbanWaterResourcesandEnvironment(SKLUWRE),DepartmentofEnvironmentalScienceandEngineering,HarbinInstituteofTechnology,HuangheRoad73,NangangDistrict,Harbin150090,PRChinaarticleinfoabstractArticlehistory:Inthisstudy,TiO2nano-particlesdecorat
3、edTiO2nano-tubesarrays(TiO2NPs/TiO2NTAs)photoelec-Received3May2013trodeshavebeensuccessfullypreparedthroughanodization,combinedwithultrasonicstrategy,followedReceivedinrevisedform12June2013by15annealingpost-treatment.Themorphologyandstructureoftheas-preparedTiO2NPs/TiO2NTAsJune2013Acceptedphotoe
4、lectrodesAvailableonline2July2013werecharacterizedbyscanningelectronsmicroscopy(SEM),N2adsorption/desorptionisotherms,X-raydiffraction(XRD)andUV–visiblelightdiffusereflectionspectroscopy(DRS).Inaddi-tion,•Keywords:thegenerationofhydroxylradicals(OH)wasdetectedbyaphotoluminescence(PL)spectrausingt
5、erephthalicTiONPs/TiONTAsacid(TA)asaprobemolecule.Furthermore,thephotoelectrochemical(PECH)properties22photoelectrodeofPhotoanodeTiO2NPs/TiO2NTAsphotoanodewereinvestigatedthroughtransientopencircuitpotential(OCP),photocurrentAnodizationresponse(PCR)andelectrochemicalimpedancespectroscopy(EIS).It
6、wasfoundthatTiO2NPs/TiONTAs−2Photoelectrocatalysis2photoelectrodeexhibitedadistinctdecreaseofOCPof−0.219mVcmandPCRof0.049−2DiclofenacmAcm,whileasignificantlyenhancedphotoelectrocatalytic(PEC)efficiencyof63.6%(0.4Vvs.SCE)forthedegradationofdiclofenac.Moreover,theenhancedPECmechanismofTiO2NPs/TiO2NT
7、Asphotoanodewasproposed.ThehighPECperformancecouldbeattributedtothedecorationofTiO2NPs,whichcouldimprovethemobilityandseparationefficiencyofphotoinducedchargecarriersunderexternalpotential.©2013ElsevierLtd.Allrightsreserved.1
