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1、ARTICLESimultaneousEtchingandDopingofTiO2NanowireArraysforEnhancedPhotoelectrochemicalPerformance???????YongchengWang,Yue-YuZhang,JingTang,HaoyuWu,MingXu,ZhengPeng,Xin-GaoGong,andGengfengZheng?,*??LaboratoryofAdvancedMaterials,DepartmentofChemistry,Fu
2、danUniversity,Shanghai,200433,People'sRepublicofChinaandKeyLaboratoryofComputationalPhysicalSciences,MinistryofEducation,StateKeyLaboratoryofSurfacePhysics,andDepartmentofPhysics,FudanUniversity,Shanghai,200433,People'sRepublicofChinaABSTRACTWedevelop
3、edapostgrowthdopingmethodofTiO2nanowirearraysbyasimultaneoushydrothermaletchinganddopinginaweaklyalkalinecondition.Theobtainedtungsten-dopedTiO2coreshellnanowireshaveanamorphousshellwitharoughsurface,inwhichWspeciesareincorporatedintotheamorphousTiO2
4、shellduringthissimultaneousetching/regrowthstepfortheoptimizationofphotoelectrochemicalperformance.PhotoanodesmadeoftheseW-dopedTiO2coreshellnanowiresshowa2muchenhancedphotocurrentdensityof～1.53mA/cmat0.23VvsAg/AgCl(1.23Vvsreversiblehydrogenelectrode
5、),almost225%ofthatofthepristineTiO2nanowirephotoanodes.TheelectrochemicalimpedancespectroscopymeasurementandthedensityfunctionaltheorycalculationdemonstratethatthesubstantiallyimprovedperformanceofthedualW-dopedandetchedTiO2nanowiresisattributedtothee
6、nhancementofchargetransferandtheincreaseofchargecarrierdensity,resultingfromthecombinatione?ectofetchingandW-doping.Thisunconventional,simultaneousetchinganddopingofpregrownnanowiresisfacileandtakesplaceundermoderateconditions,anditmaybeextendedforoth
7、erdopantsandhostmaterialswithincreasedphotoelectrochemicalperformances.KEYWORDS:photoelectrochemical.TiO2.nanowires.doping.etching.densityfunctionaltheory1314hecontinuingandincreasingfocus(NPs)andmesoporousstructures,TiO2onsolarenergy-drivenphotoelect
8、ro-NWsandNTshavelowerspeci?csurfaceTchemical(PEC)conversionhasin-areas,thuslimitingtheelectrode/electrolytespiredsubstantialresearchdevelopmentofinterfacefortheelectrochemicalreactions.newsemiconductingmaterialsandstructuresThechemicaldopingof
