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1、ARTICLEINPRESSPhysicaB387(2007)302–312www.elsevier.com/locate/physbCO2sensorstudiedbyimpedancespectroscopyM.Wierzbicka,P.Pasierb,M.RekasAGHUniversityofScienceandTechnology,FacultyofMaterialsScienceandCeramics,Al.Mickiewicza30,30-059Cracow,PolandReceived21December2005;receivedinrevisedform3Apri
2、l2006;accepted11April2006AbstractElectrochemicalimpedancespectroscopy(EIS)wasappliedtostudytheeffectofheattreatmentconditions(temperatureandtimeofheating)onelectricalpropertiesofelectrochemicalgassensors.TheuseofEISmethodallowedobservingtheeffectofundesirablechemicalreactioninelectrochemicalcel
3、ls(sensors)bythedetectionofchangeofelectricalpropertiesattheveryearlystageofsuchreaction.Additionofbariumcarbonatetolithiumcarbonateresultedinlong-termstabilizationofelectricalpropertiesofthesystemcarbonatephasesolidelectrolyte.Itwasfoundthatimpedancespectraofthecell:carbonate
4、Au
5、YSZ
6、Ptwithinne
7、rAuelectrodeprovidedthemostusefulinformationaboutreactivityprogressbetweenbothphases.r2006ElsevierB.V.Allrightsreserved.PACS:82.47.Rs;84.37.+qKeywords:Electrochemicalgassensors;Solidelectrolytes;Yttria-stabilizedzirconia;Impedancespectroscopy1.Introductionreaction:2MttCOt1Ot2eDMCO.(2)Yttria-st
8、abilizedzirconia,YSZ,isawellknownsolid22223electrolyteandhasbeenthesubjectofnumerousstudies.ItAtthereferenceelectrode(right-sideelectrode)theisastrategicfunctionalmaterialwhichhasfoundextensivefollowingreactiontakesplace:applicationinelectrochemicaldevicessuchassolidoxide2O2DOt4e.(3)fuelcells
9、,oxygensensorsandpumps.Recently,yttria2stabilizedzirconiaoritscloseanalogouscalcia-orTocloseanelectrochemicalcircuitbetweenM2CO3andmagnesia-stabilizedzirconiawereusedinconstructionofYSZ,Miuraetal.[1]assumedthatadditionalphaseCO2orSOxpotentiometricsensors[1–4].ThestructureofM2ZrO3isformedasaprod
10、uctoftheinterfacereactionsuchCO2sensorinvolvingthestabilizedzirconiaasthebetweencarbonateandYSZphasesplayingtheroleofthesolidelectrolytecanbeexpressedasionicbridge:Au;CO2epCOT;O2jM2CO3jYSZjO2;Pt;(1)2MttO2tZrODMZrO.(4)2223Withthes
