CO2 sensor studied by impedance spectroscopy

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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:2MþþCOþ1Oþ2eÐMCO.(2)Yttria-st

8、abilizedzirconia,YSZ,isawellknownsolid22223electrolyteandhasbeenthesubjectofnumerousstudies.ItAtthereferenceelectrode(right-sideelectrode)theisastrategicfunctionalmaterialwhichhasfoundextensivefollowingreactiontakesplace:applicationinelectrochemicaldevicessuchassolidoxide2O2ÐOþ4e.(3)fuelcells

9、,oxygensensorsandpumps.Recently,yttria2stabilizedzirconiaoritscloseanalogouscalcia-orTocloseanelectrochemicalcircuitbetweenM2CO3andmagnesia-stabilizedzirconiawereusedinconstructionofYSZ,Miuraetal.[1]assumedthatadditionalphaseCO2orSOxpotentiometricsensors[1–4].ThestructureofM2ZrO3isformedasaprod

10、uctoftheinterfacereactionsuchCO2sensorinvolvingthestabilizedzirconiaasthebetweencarbonateandYSZphasesplayingtheroleofthesolidelectrolytecanbeexpressedasionicbridge:Au;CO2ðpCOÞ;O2jM2CO3jYSZjO2;Pt;(1)2MþþO2þZrOÐMZrO.(4)2223Withthes