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《A flow channel design procedure for PEM fuel cells with effective water removal》由會員上傳分享，免費在線閱讀，更多相關內容在學術論文-天天文庫。
1、JournalofPowerSources163(2007)933942A?owchanneldesignprocedureforPEMfuelcellswitheffectivewaterremovalXianguoLi?,ImranSabir,JaewanParkDepartmentofMechanicalEngineering,UniversityofWaterloo,Waterloo,OntarioN2L3G1,CanadaReceived29August2006;receivedinrevisedform3October2006;accepted4October2006Avail
2、ableonline13November2006AbstractProperwatermanagementinpolymerelectrolytemembrane(PEM)fuelcellsiscriticaltoachievethepotentialofPEMfuelcells.Membraneelectrolyterequiresfullhydrationinordertofunctionasprotonconductor,oftenachievedbyfullyhumidifyingtheanodeandcathodereactantgasstreams.Ontheotherhand
3、,waterisalsoproducedinthecellduetoelectrochemicalreaction.Thecombinedeffectisthatliquidwaterformsinthecellstructureandwater?oodingdeterioratesthecellperformancesigni?cantly.Inthepresentstudy,adesignprocedurehasbeendevelopedfor?owchannelsonbipolarplatesthatcaneffectivelyremovewaterfromthePEMfuelcel
4、ls.Themaindesignphilosophyisbasedonthedeterminationofanappropriatepressuredropalongthe?owchannelsothatalltheliquidwaterinthecellisevaporatedandremovedfrom,orcarriedoutof,thecellbythegasstreaminthe?owchannel.Atthesametime,thegasstreaminthe?owchannelismaintainedfullysaturatedinordertopreventmembrane
5、electrolytedehydration.Sample?owchannelshavebeendesigned,manufacturedandtestedfor?vedifferentcellsizesof50,100,200,300and441cm2.Similarcellperformancehasbeenmeasuredforthese?vesigni?cantlydifferentcellsizes,indicatingthatscalingofthePEMfuelcellsispossibleifliquidwater?oodingormembranedehydrationca
6、nbeavoidedduringthecelloperation.Itisobservedthatnoliquidwater?owsoutofthecellattheanodeandcathodechannelexitsforthepresentdesignedcellsduringtheperformancetests,andvirtuallynoliquidwatercontentinthecellstructurehasbeenmeasuredbytheneutronimagingtechnique.Thesemeasurementsindicatethatthepresentdes
7、ignprocedurecanprovide?owchannelsthatcaneffectivelyremovewaterinthePEMfuelcellstructure.?2006ElsevierB.V.Allrightsreserved.Keywords:PEMfuelcells;Flowchanneldesign;Water?ooding;Neutronimagingtechnique1.Introductio
