Al／Pb-Ag阳极在锌电积过程中的阳极行为和微观结构.pdf

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1、TransactionsofNonfc}rrousMetals黉Av·ailable：o，nSlinecaitewnwwc．secieDnceidrierect．ctomSocietyofChinaPressTrans．NonferrousMet．Soc．China24(2014)893-899www．tnmsc．crlAnodicbehaviorandmicrostructureofA1／Pb—AganodeduringzincelectrowinningYong—chunZHANG，Bu—r

2、uingCHEN，Hai．taoYANG，Zhong—chengGUO，，Rui．dongXU1．FacultyofMetallurgyandEnergyEngineering，KunmingUniversit)，ofScienceandTechnology,Kunming650093，China；2．KunmingHenderaofScienceandTechnologyCo．Ltd，Kunming650106，ChinaReceived6March2013；accepted5November

3、2013Abstract：AnodicbehaviorsandoxygenevolutionkineticsofPb—O．8％AgandA1／Pb-0．8％Aganodesduringtheinitial24hzincelectrowinningwereinvestigatedwithcyclicvoltammetry(Cv)curvesandelectrochemicalimpedancespectroscopy(EIS)．Theresultsrevealthattheanodiebehavi

4、orsandreactionkineticsofthetwoano~svaryalotduringtheanodicpolarizationwhichindicatetheformationandstabilizationofanodiclayer．ComparedwithconventionalPb-0．8％Aganode．Al门Pb-0．8％Aganodehaslongertimeofanodicpolarization．Attheverybeginningofanodicpolarizat

5、ion，thetwoanodesallexhibithigherpotentialofoxygenevolutionreaction(OER)sincethereactioniscontrolledbythetransformationstepofintermediates．Then，its0ERpotentialislargelydiminishedandOERrateisdeducedfromtheformationandadsorptionofthefirstintermediatefS—

6、OHaas)．Intheprolongedanodicpolarization。theanodicpotentialofAl／Pb—O．8％AggraduallydecreasesandthefinalvalueismorestablethanthatofconventionalPb-0．8％Aganode．Ontheanodiclayerafter24hofanodicpolarization．the0ERpotentialiscontrolledbytheformationandadsorp

7、tionofintermediate．ThemicrostructuresofAvP_o．8％AgandPl卜O．8％Aganodesafter24hofanodicpolarizationwereanalyzedbyscanningelectronmicroscope(SEM1．Keywords：zincelectrowinning；oxygenevolutionkinetics；electrochemicalimpedancespectroscopy；oxygenevolutionreact

8、ionpotentialanodes，showingthatpropertiesofconventionalPb_Ag1IntroductionanodesdependontheirAgcontent．Theshapeofanodesalsocaninfluencetheirproperties．Forinstance，Thedemandforenergy—savingandhigherstandardcomparedwithconventionalPb-Aganodes．porousofcat