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时间:2019-07-01
《A low temperature sensor for the detection of carbon monoxide in hydrogen (1)》由会员上传分享,免费在线阅读,更多相关内容在学术论文-天天文库。
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
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