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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,RepublicofKoreaReceived24March
2、2006;accepted10July2006Abstract：Thepromiseoffuelcellsystemsusingliquidfuels,suchasthedirectmethanolfuelcell(DMFC)anddirectborohydridefuelcell(DBFC),tocomplementorsubstituteforexistingbatteriesisbecomingrecognized,alongwiththeirpotentialasafuturetechnologyformobilean
3、dportablepowersupplies.Thekeyissueiswhichtypeoffuelcellismorecompetitiveforsuchpowersupplies:DMFCorDBFC?Toanswerthisquestion,thepresentstudyanalyzesanddiscussestherelativecompetitivenessofthesetwosystemsgiventhecurrentstatusofthetechnologiesandassumingsomegenerallya
4、cceptedconditions.ThefindingsconfirmthattheDBFCsystemissuperiortotheDMFCsystemintermsofcellsizeandfuel(orfuelsolution)consumption.Thus,theDBFCsystemisbettersuitedtoapplicationsthatrequiresmalloperationalspace.Ontheotherhand,thetotaloperatingcostsofDBFCsystemsarehigh
5、erthanthoseofDMFCsystems.Accordingtothetotalcostformulaederivedintheanalysis,theDBFCsystembecomesrelativelyuneconomicathigherpoweroutputsandlongeroperationtimes,butmaybemorefavourableinspecificportableapplicationssuchasminiaturizedormicropowersystemswithshortoperati
6、onaltimespans.Keywords:Directmethanol;Fuelcell;Sodiumborohydride;Portablepowersupply;Methanol;Hydrogen1．IntroductionWiththerapiddevelopmentofmobilecommunicationsandmobileInternettechnology,themarketforportableelectronicdevicesiscertaintoexperiencecontinuedgrowth.Atp
7、resent,thepowersuppliesusedforportableappliancesaremostlyrechargeableLi-or科技英语文献Ni-basedbatterysystems.GiventherapiddevelopmentofLi-basedbatterytechnologyoverthepastdecade,thissystemhassucceededindominatingsupplyapplicationsinmarketssuchaslaptopcomputers,mobilephone
8、s,andpersonaldigitalassistants.Inthecurrentportableappliancemarket,thereisgrowingpressureonbatterymanufacturerstoincreasespecificenergyfor
