質(zhì)子交換膜燃料電池用微孔層的研究.pdf

1、武漢理工大學(xué)碩士學(xué)位論文質(zhì)子交換膜燃料電池用微孔層的研究姓名：汪圣龍申請學(xué)位級(jí)別：碩士專業(yè)：材料加工工程指導(dǎo)教師：潘牧20050601武漢理工大學(xué)碩士論文AbstractTheMicro—Porouslayer(MPL)madeupofcarbonpowder(VXC一72)andhydrophobicagent(PTFE)sandwichedbetweencatalystlayerandgasdiffusionlayer(GDL)of

2、ProtonExchangeMembraneFuelCell(PEMFC)candealwithwaterfloodwellandimprovetheperformanceofPEMFCInthispaperMPLOllwetproofcarbonpaperwerepreparationbyscreenprintertechnologyThehydrophobicityofMPLwascharacterizedbycontactangl

3、eWaterexpelledcapacitywasevaluatedbytheperformanceofassembledsinglecellThemorphologicalcharacteristicsweremeasuredusingscanningelectronmicroscopy(SEM)Theporestructurewastestedusingmercury—intrusionporosimetryTheeffectofP

4、TFEcontent，pore—formercontentandporeshapeintheMPLontheperformanceofPEMFCwereinvestigatedrespectivelyThestaticresistanceofassembledcellwasanalyzedConclusionshadbeensummarizedasfollowing：(1)ComparingwithcellwithoutMPL，thei

5、ntemalresistanceofsinglecellswithMPLismuchlowerAsthecurrentdensityincrease，theinternalresistancesofsinglecellsdecreaseuntilsinglecellsreachthehighestperformance，theninternalresistanceincreaseTheperformanceofsinglecellwit

6、h30％PTFEMPListhebestoneatthehigherdensity(i700mA／cm2)，thehighercurrentdensitythebiggeradvantagethatMPLw燭30％PTFEshowsTheporesizedistributionofMPLisbetween0011tandlOu，thereistwomainpore，oneisO08～10u，inchargeofexpellingwate

7、rtheotheris0010。08U，inchargeoftransferringgas，themoreporevolumebetweenO08uand10uis、themoreexcellentwaterexpelledcapacityis，theelectrodefloodreduceInordertokeepenotl曲gaschannels，porevolumebetweenO01laandO08uneedtol∞epacer

8、tainvolume，theperformanceofsinglecellCallbekept(2)NH4CLisaneffectiveporeformer，AnappropriateamountofNH4CLcontentintheMPLcanimprovetheperformanceofsinglecell，especiallyathi曲currentdensity(，900mA／em2)NH4CLalmostdoesn’tweal

9、(enthehydrophobicityofMPLInthecontrarythehydrophobicitycanbeimprovedslightlyAsNIhCLcontentincrease，theporosityofMPLincrease，theinternalresistanceofsinglecelldecreaseexceptMPLwith70％NH4CLSuperabundantNH4CL(70％)resultrough