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Self-doped Ti02 Nanotube Arrays for Supercapacitors

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PDF文件

關鍵詞：

Titanium dio xide Nanotube arrays Self-doped Supercapacitors

資料大小：

79K

所屬學科：

分子表征

來源：

第六屆亞歐研討會上處理和性能增強聚合物會議文集（2013.6.2-6 武漢）

簡介：

Self-dopedTi02nanotubearrays(denotedasSTNTs)forsupercapacitorsapplicationwerepreparedbytreatingtheTi02nanotubearrays(denotedasTNTs)withafacilecathodicreductionprocesstotailoritssemiconductorcharacteristic.TheTNTswerepreparedbyanelectrochemicalanodizationprocessinatwo-electrodesystem.Inshort,cleaned,polishedtitaniummetalstripswereanodizedat20VDCfortwohoursinasolutionof0.5wt%NH4Fand10wt%H20inethyleneglycol.Aftercalcinedat4500Cfor2hrs,theas-preparedTNTswerepolarizedatanegativepotentialintherangesof-1Vto-2Vfor10minutesinathree-electrodesystemusingtheTNTs,saturatedcalomelelectrode(SCE)andPtmeshastheworking,reference,andcounterelectrodes,respectively.Preliminarystudiesindicate-1.4Vistheoptimumappliedpotential.ThestructureoftheSTNTsconsistsofhighlyorderedtubeswithinnerdiameterof50一80nm,wallthicknessof10-15nmandtubelengthofl.8～2ym,whichareinidenticaldimensionwiththatofTNTs.TheXPSpeaksoftheSTNTscenteredatabout458.5and464.3eV(correspondtothecharacteristicofTi2plt2andTi2p3t2peaks)showanegativeshiftcomparedtoTNTsandindicatethepresenceofTi3+intheSTNTs.TheformationofoxygenvacanciesisfurtherconfirmedbytheRamanspectrawiththepeaksoftheSTNTsnegativelyshiftedandbroadencomparedtoTNTssample.Theelectrochemicalpropertiesofthesampleswereinvestigatedwithelectrochemicalimpedancespectroscopy(EIS),cyclicvoltammetry(CV)andgalvanostaticcharge-dischargetestsbyanelectrochemicalworkstation.Asresultsofself-doped,theelectrochemicalactivityandconductivityoftheTi02nanotubearrayswerehighlyimproved.ComparedtopristineTNTs,theSTNTssampledeliversaCVcurveclosetoanidealrectangularshapeandshowsexcellentcapacitivecharacteristic.TheareacapacitanceoftheSTNTsis27timeslargerthanthepristineTNTs.Inconclusion,afacilecathodicreductionmethodwasproposedtointroduceoxygenvacanciesintotheTi02nanotubearrays.Improvedelectrochemicalactivity,higherconductivityandenhancedcapacitanceweredemonstratedfortheself-dopedTNTs.

作者：

H. Zhou, Y. R. Zhang

上傳時間：

2013-07-03 13:51:50

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