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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,RepublicofKoreaReceived24March2006;acc
2、epted10July2006Abstract：Thepromiseoffuelcellsystemsusingliquidfuels,suchasthedirectmethanolfuelcell(DMFC)anddirectborohydridefuelcell(DBFC),tocomplementorsubstituteforexistingbatteriesisbecomingrecognized,alongwiththeirpotentialasafuturetechnologyformobileandportablepowersu
3、pplies.Thekeyissueiswhichtypeoffuelcellismorecompetitiveforsuchpowersupplies:DMFCorDBFC?Toanswerthisquestion,thepresentstudyanalyzesanddiscussestherelativecompetitivenessofthesetwosystemsgiventhecurrentstatusofthetechnologiesandassumingsomegenerallyacceptedconditions.Thefin
4、dingsconfirmthattheDBFCsystemissuperiortotheDMFCsystemintermsofcellsizeandfuel(orfuelsolution)consumption.Thus,theDBFCsystemisbettersuitedtoapplicationsthatrequiresmalloperationalspace.Ontheotherhand,thetotaloperatingcostsofDBFCsystemsarehigherthanthoseofDMFCsystems.Accordi
5、ngtothetotalcostformulaederivedintheanalysis,theDBFCsystembecomesrelativelyuneconomicathigherpoweroutputsandlongeroperationtimes,butmaybemorefavourableinspecificportableapplicationssuchasminiaturizedormicropowersystemswithshortoperationaltimespans.Keywords:Directmethanol;Fu
6、elcell;Sodiumborohydride;Portablepowersupply;Methanol;Hydrogen1．IntroductionWiththerapiddevelopmentofmobilecommunicationsandmobileInternettechnology,themarketforportableelectronicdevicesiscertaintoexperiencecontinuedgrowth.Atpresent,thepowersuppliesusedforportableappliances
7、aremostlyrechargeableLi-or科技英语文献Ni-basedbatterysystems.GiventherapiddevelopmentofLi-basedbatterytechnologyoverthepastdecade,thissystemhassucceededindominatingsupplyapplicationsinmarketssuchaslaptopcomputers,mobilephones,andpersonaldigitalassistants.Inthecurrentportableappli
8、ancemarket,thereisgrowingpressureonbatterymanufacturerstoincreasespecificenergyfor
