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1、SensorsandActuatorsB119(2006)398408MixedpotentialNOxsensorsusingthinfilmelectrodesandelectrolytesforstationaryreciprocatingenginetypeapplicationsEricL.Brosha∗,RangacharyMukundan,RogerLujan,FernandoH.GarzonLosAlamosNationalLaboratory,MSD429,ElectrochemicalMaterialsandDevicesGroup,Los
2、Alamos,NM87545,USAReceived8August2005;receivedinrevisedform15December2005;accepted19December2005Availableonline24January2006AbstractMixedpotentialsensorsusingdense,thinfilmmetaloxideworkingelectrodes,Ptcounterelectrodes,andthinfilmYSZelectrolytesonAl2O3polycrystallineandsapphiresubst
3、rateswerepreparedandstudiedbetween450and650◦C.TheirresponsetoNO,NO,CO,andC1andC32hydrocarbonsin10.4%O2/N2balanceandinairatmosphereswascharacterized.Thelanthanumchromite-basedsensorsshowedpreferentialsensitivitytoNO2withcrosssensitivitytoCOandnon-methanehydrocarbonssuchasC3H6andC3H8
4、withthehighestNOxsensitivityandminimalCO/HCcrosssensitivityexhibitedbyasensorpreparedwithaLa0.8Sr0.2CrO3workingelectrode.StudiesoftheMg-dopedLaCrO3devicesconductedforupto800hat600◦Cshowedminimalaginginthesedevices.Incontrast,sensorsfabricatedwithspinelNiCrOorZnFeO2424workingelectro
5、desshowedpreferentialsensitivitytoHCsandminimalsensitivitytoNO2.SensorsfabricatedwithY0.16Tb0.3Zr0.54O2−∂workingelectrodesrequiredoperatingtemperaturesinexcessof600◦Cand,likethespinels,showedminimalNOsensitivity.Aprototypethree-electrodexmixedpotentialdeviceforthedetectionofmultipl
6、egaseswasalsodemonstrated.TheuseofaheatedPtblackpre-catalystupstreamtothesensorwasdemonstratedtoeffectivelyremovetheCOandhydrocarbonresponse.©2005ElsevierB.V.Allrightsreserved.Keywords:Electrochemicalsensor;NOxsensor;Mixedpotential1.Introductionoverallcombustionefficiency.Sensorsare
7、requiredforenginefeedbackcontrol,NOxemissionsmonitoringandcontrol,Reciprocatinggasenginesarewellsuitedforsmall-scaleandsensorstocontroltheregenerationofreductioncatalysts.powergeneration.Theyprovidehighreliability,inexpensiveTheNOxemissionstargetfornaturalgas-firedreciprocatingback-
8、uppower,powerforremoteloca
