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1、科技英语文献科技英语文献Whichtypeoffuelcellismorecompetitiveforportableapplication:Directmethanolfuelcellsordirectborohydridefuelcells?Jung-HoWeeDepartmentofChemicalandBiologicalEngineering,KoreaUniversity,1,5-Ga,Anam-Dong,Seongbuk-Gu,Seoul136-701,RepublicofKoreaReceiv
2、ed24March2006;accepted10July2006Abstract：Thepromiseoffuelcellsystemsusingliquidfuels,suchasthedirectmethanolfuelcell(DMFC)anddirectborohydridefuelcell(DBFC),tocomplementorsubstituteforexistingbatteriesisbecomingrecognized,alongwiththeirpotentialasafuturetec
3、hnologyformobileandportablepowersupplies.Thekeyissueiswhichtypeoffuelcellismorecompetitiveforsuchpowersupplies:DMFCorDBFC?Toanswerthisquestion,thepresentstudyanalyzesanddiscussestherelativecompetitivenessofthesetwosystemsgiventhecurrentstatusofthetechnologi
4、esandassumingsomegenerallyacceptedconditions.ThefindingsconfirmthattheDBFCsystemissuperiortotheDMFCsystemintermsofcellsizeandfuel(orfuelsolution)consumption.Thus,theDBFCsystemisbettersuitedtoapplicationsthatrequiresmalloperationalspace.Ontheotherhand,thetot
5、aloperatingcostsofDBFCsystemsarehigherthanthoseofDMFCsystems.Accordingtothetotalcostformulaederivedintheanalysis,theDBFCsystembecomesrelativelyuneconomicathigherpoweroutputsandlongeroperationtimes,butmaybemorefavourableinspecificportableapplicationssuchasmi
6、niaturizedormicropowersystemswithshortoperationaltimespans.Keywords:Directmethanol;Fuelcell;Sodiumborohydride;Portablepowersupply;Methanol;Hydrogen1．IntroductionWiththerapiddevelopmentofmobilecommunicationsandmobileInternettechnology,themarketforportableele
7、ctronicdevicesiscertaintoexperiencecontinuedgrowth.Atpresent,thepowersuppliesusedforportableappliancesaremostlyrechargeableLi-or科技英语文献Ni-basedbatterysystems.GiventherapiddevelopmentofLi-basedbatterytechnologyoverthepastdecade,thissystemhassucceededindominat
8、ingsupplyapplicationsinmarketssuchaslaptopcomputers,mobilephones,andpersonaldigitalassistants.Inthecurrentportableappliancemarket,thereisgrowingpressureonbatterymanufacturerstoincreasespecificenergyfor
