A low temperature sensor for the detection of carbon monoxide in hydrogen (1)

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1、SolidStateIonics175(2004)497–501www.elsevier.com/locate/ssiAlowtemperaturesensorforthedetectionofcarbonmonoxideinhydrogenRangacharyMukundan*,EricL.Brosha,FernandoH.GarzonLosAlamosNationalLaboratory,MSD429,MST-11.LosAlamos,NM87545,UnitedStatesReceived1May2003;accepted14

2、February2004AbstractAsensortodetectthecarbonmonoxideinareformatestreamthatfuelsapolymerelectrolytemembrane(PEM)fuelcellispresented.ThiselectrochemicalsensorconsistsofaNafionRelectrolyteandPt-orRu-basedelectrodesandworksontheprincipleofdifferentialCOpoisoningofthevariou

3、spreciousmetalelectrodes.Varyingthecompositionandloadingofthepreciousmetalintheelectrodeoptimizedtheresponseofthesensor.AsensorwithaworkingelectrodeofPtandapseudo-referenceelectrodeofPt–Rualloy2andapreciousmetalloadingof10mg/cmshowedastableandreproducibleresponseto10–2

4、00ppmofCOatroomtemperatureand100–1000ppmCOat708C.D2004ElsevierB.V.Allrightsreserved.PACS:07.07.D;84.60.GKeywords:Sensors;Carbonmonoxide;Fuelcells;Platinumandruthenium1.IntroductionFuelcellsystemsoperatingonreformateuseair-bleedingmethodstoreducethecarbonmonoxidepoisoni

5、ngofthePtPolymerelectrolytemembrane(PEM)fuelcellsareanode[6].ThequantityofairneededisdependentonthecurrentlybeingdevelopedfortransportationapplicationsCOconcentrationandvariesfrom2%to10%air(or0.4–[1].Sinceliquidhydrocarbonsarethemostwidelyavailable2%oxygen)astheCOconce

6、ntrationvariesfrom5tofuelfortransportation,muchresearchisbeingconductedto100ppm[6].Sincetheair-bleedingsystemsleadtoaoptimizelowcostfuelreformersystemsthatconvertthisdecreaseintheefficiency,theuseofaCOsensorinafueltohydrogengascontainingstreams[2].Thishydrogenfeedbackl

7、oopcanprovidetheappropriateamountofairgastypicallyfeedsaPEMfuelcellstackutilizingplatinumdependingontheCOconcentrationinthefuel.basedanodes.ItiswellknownthatlowconcentrationsofCurrently,researchonseveraltechnologiesthatmeasurecarbonmonoxide(~10–100ppm)impuritiesinhydro

8、gentheamountofCOinareformatestreamisongoingcanseverelydegradetheperformanceofPEMfuelcell[4,5,7,8].Themostadvancedofth