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1、CorrosionScience69(2013)376–388ContentslistsavailableatSciVerseScienceDirectCorrosionSciencejournalhomepage:www.elsevier.com/locate/corsciCorrosionofconductivepolypyrrole:Effectsofcontinuouscathodicandanodicpolarisationaa,?a,ba,b,?KaiQi,YubingQiu,ZhenyuChen,XingpengGuoaSchoolofChemistryandC
2、hemicalEngineering,HuazhongUniversityofScienceandTechnology,Wuhan430074,PRChinabHubeiKeyLaboratoryofMaterialsChemistryandServiceFailure,Wuhan430074,PRChinaarticleinfoabstractArticlehistory:Theeffectsofcontinuouscathodicandanodicpolarisationonthecorrosionofpolypyrrole(PPy)?lmsReceived25Augus
3、t2012wereinvestigatedinneutral0.1MNaClwithvariouselectrochemicalmethodsandspectroscopicanaly-Accepted2January2013ses.Withcontinuouscathodicpolarisation,thePPy?lmnearlymaintainstheconjugatedstructureofPPyAvailableonline10January2013chains,butlosesitselectroactivityslightly.Withincreasesinano
4、dicpolarisationpotentialandpolarisa-tiontime,theelectroactivitylossofthepolarisedPPy?lmincreasesrapidlyespeciallyatahigheranodicKeywords:potential;whilethedamagetotheconjugatedstructureofPPychainsalsobecomessevererwithincreas-A.Polymeringpolarisationtime.Themechanismsinvolvedwerediscussed.B
5、.Cyclicvoltammetryó2013ElsevierLtd.Allrightsreserved.B.XPSC.PotentialparametersC.Oxygenreduction1.IntroductionAsearlyas1982,Bardetal.foundthatanirreversiblechangeofPPyoccurredatpotentialshigherthan0.6Vvs.saturatedcalomelPolypyrrole(PPy)isoneofthemostextensivelystudiedandelectrode(SCE)leadin
6、gtoanirreversibledecreaseinitsredoxusedconductivepolymersowingtoitsadvantageousphysicalactivityandelectronicconductivity[27],whichisalsocalledove-andchemicalproperties,suchasrelativelyhighconductivity,novelroxidationofPPy.Geetal.measuredXPSspectraofPPybeforeelectrochemicalandopticalproperti
7、es,goodbiocompatibility,andandafteroveroxidationandfoundthattheb-Cofpyrrolewasoxi-easeofsynthesisbychemicalorelectrochemicalmethods[1–6].disedtoC@Oduringtheoveroxidation[28].Pereiraetal.foundaPPyhasbeenwidelyusedasarti?cialmuscles[7,8],electrodehugeincre
