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1、Int.J.Electrochem.Sci.,7(2012)8420-8435InternationalJournalofELECTROCHEMICALSCIENCEwww.electrochemsci.orgProtonandOxygenIonicConductivityofDopedCeria-CarbonateCompositebyModifiedWagnerPolarization1,2,§1,§1,*112,*LiangdongFan,GuoquanZhang,MingmingChen,ChengyangWang,JingDi,BinZhu1KeyLabo
2、ratoryforGreenChemicalTechnologyofMinistryofEducation,SchoolofChemicalEngineeringandTechnology,TianjinUniversity,Tianjin300072,PRChina2DepartmentofEnergyTechnology,RoyalInstituteofTechnology,SE-10044Stockholm,Sweden§bothauthorscontributeequallytothisarticle*E-mail:chmm@tju.edu.cn;binzh
3、u@kth.seReceived:6June2012/Accepted:15July2012/Published:1September2012Theimpressiveionicconductivityandtunableconductionbehaviorshavemadetheceria-carbonatecompositeanattractiveelectrolyteforlowtemperatureceramicfuelcells.However,theconductionmechanismisnotyetwellstudied.Inthepresentst
4、udy,bothprotonandoxygenionconductivityaswellasthetransportpropertiesofsamaria-dopedceria/sodium-lithium-carbonate(denotedasSDCLN)compositeareinvestigatedbythefuelcellstudyandthemodifiedHebb-Wagnerpolarizationmeasurements.Themulti-ionicpolarizationbehaviorsandthetransferprocessesincompo
5、site-2electrolyteunderexternalelectricalfieldareanalyzed.Amaximumpowerdensityof780mWcm-1andacalculatedtotalion(protonandoxygenion)conductivityof0.153ScmareobtainedunderH2/oairconditionat550C.TheWagnerDCpolarizationmeasurementsshowthattheprotonconductiondominatesthetotalionicconductivit
6、y.Asynergisticeffectexistsbetweenthechargecarriersinthedopedceria-carbonatecompositesystem.Anidealinterfacialconductionmodelisalsoproposedbasedontheobtainedresults.Keywords:Solidoxideorceramicfuelcell;Ceria-carbonatecompositeelectrolyte;Protonandoxygenionconductivity;Wagerpolarization;
7、Synergisticeffect1.INTRODUCTIONInrecentyears,Ceria-basedcompositematerialshavebeenextensivelystudiedastheelectrolyteforlowtemperaturesolidoxidefuelcells(SOFCs)orceramicfuelcells[1-22].Ithasbeen-2-1demonstratedwithmanyadvantagesoversingle-phaseelectrolytes:i)higherconductivityof10-10-
