A low temperature sensor for the detection of carbon monoxide in hydrogen

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1、SolidStateIonics175(2004)497–501www.elsevier.com/locate/ssiAlowtemperaturesensorforthedetectionofcarbonmonoxideinhydrogenRangacharyMukundan*,EricL.Brosha,FernandoH.GarzonLosAlamosNationalLaboratory,MSD429,MST-11.LosAlamos,NM87545,UnitedStatesReceived1May2003;accepted14February2004AbstractAse

2、nsortodetectthecarbonmonoxideinareformatestreamthatfuelsapolymerelectrolytemembrane(PEM)fuelcellispresented.ThiselectrochemicalsensorconsistsofaNafionRelectrolyteandPt-orRu-basedelectrodesandworksontheprincipleofdifferentialCOpoisoningofthevariouspreciousmetalelectrodes.Varyingthecomposition

3、andloadingofthepreciousmetalintheelectrodeoptimizedtheresponseofthesensor.AsensorwithaworkingelectrodeofPtandapseudo-referenceelectrodeofPt–Rualloy2andapreciousmetalloadingof10mg/cmshowedastableandreproducibleresponseto10–200ppmofCOatroomtemperatureand100–1000ppmCOat708C.D2004ElsevierB.V.All

4、rightsreserved.PACS:07.07.D;84.60.GKeywords:Sensors;Carbonmonoxide;Fuelcells;Platinumandruthenium1.IntroductionFuelcellsystemsoperatingonreformateuseair-bleedingmethodstoreducethecarbonmonoxidepoisoningofthePtPolymerelectrolytemembrane(PEM)fuelcellsareanode[6].Thequantityofairneededisdepende

5、ntonthecurrentlybeingdevelopedfortransportationapplicationsCOconcentrationandvariesfrom2%to10%air(or0.4–[1].Sinceliquidhydrocarbonsarethemostwidelyavailable2%oxygen)astheCOconcentrationvariesfrom5tofuelfortransportation,muchresearchisbeingconductedto100ppm[6].Sincetheair-bleedingsystemsleadt

6、oaoptimizelowcostfuelreformersystemsthatconvertthisdecreaseintheefficiency,theuseofaCOsensorinafueltohydrogengascontainingstreams[2].ThishydrogenfeedbackloopcanprovidetheappropriateamountofairgastypicallyfeedsaPEMfuelcellstackutilizingplatinumdependingontheCOconcentrationinthefuel.basedanode

7、s.ItiswellknownthatlowconcentrationsofCurrently,researchonseveraltechnologiesthatmeasurecarbonmonoxide(~10–100ppm)impuritiesinhydrogentheamountofCOinareformatestreamisongoingcanseverelydegradetheperformanceofPEMfuelcell[4,5,7,8].Themostadvancedofth