A flow channel design procedure for PEM fuel cells with effective water removal

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1、JournalofPowerSources163(2007)933942AflowchanneldesignprocedureforPEMfuelcellswitheffectivewaterremovalXianguoLi∗,ImranSabir,JaewanParkDepartmentofMechanicalEngineering,UniversityofWaterloo,Waterloo,OntarioN2L3G1,CanadaReceived29August2006;receivedinrevisedform3October2006;accepted4October2006Avail

2、ableonline13November2006AbstractProperwatermanagementinpolymerelectrolytemembrane(PEM)fuelcellsiscriticaltoachievethepotentialofPEMfuelcells.Membraneelectrolyterequiresfullhydrationinordertofunctionasprotonconductor,oftenachievedbyfullyhumidifyingtheanodeandcathodereactantgasstreams.Ontheotherhand

3、,waterisalsoproducedinthecellduetoelectrochemicalreaction.Thecombinedeffectisthatliquidwaterformsinthecellstructureandwaterfloodingdeterioratesthecellperformancesignificantly.Inthepresentstudy,adesignprocedurehasbeendevelopedforflowchannelsonbipolarplatesthatcaneffectivelyremovewaterfromthePEMfuelcel

4、ls.Themaindesignphilosophyisbasedonthedeterminationofanappropriatepressuredropalongtheflowchannelsothatalltheliquidwaterinthecellisevaporatedandremovedfrom,orcarriedoutof,thecellbythegasstreamintheflowchannel.Atthesametime,thegasstreamintheflowchannelismaintainedfullysaturatedinordertopreventmembrane

5、electrolytedehydration.Sampleflowchannelshavebeendesigned,manufacturedandtestedforfivedifferentcellsizesof50,100,200,300and441cm2.Similarcellperformancehasbeenmeasuredforthesefivesignificantlydifferentcellsizes,indicatingthatscalingofthePEMfuelcellsispossibleifliquidwaterfloodingormembranedehydrationca

6、nbeavoidedduringthecelloperation.Itisobservedthatnoliquidwaterflowsoutofthecellattheanodeandcathodechannelexitsforthepresentdesignedcellsduringtheperformancetests,andvirtuallynoliquidwatercontentinthecellstructurehasbeenmeasuredbytheneutronimagingtechnique.Thesemeasurementsindicatethatthepresentdes

7、ignprocedurecanprovideflowchannelsthatcaneffectivelyremovewaterinthePEMfuelcellstructure.©2006ElsevierB.V.Allrightsreserved.Keywords:PEMfuelcells;Flowchanneldesign;Waterflooding;Neutronimagingtechnique1.Introductio