直接硼氢化钠燃料电池阳极催化剂的分析

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1、浙江大学硕士学位论文AbstractDirectborohydridefuelcell(DBFC)ispromisingdirectliquidfuelcellduetoitshightheoreticalcellvoltageandhighenergydensity．However，theanodicoxidationofborohydrideinalkalinemediumisfoundtobeaccompaniedwithhydrogenevolutionthatreducesfuelefficiency．Therefore，howtodepresshydrogenevoluti

2、onwithoutimpairingpolarizationpropertiesbecomesthetargetofresearch．Inthisthesis，theanodicoxidationofborohy’drideonseveralelectrocatalystswasinvestigatedusingtheelectrochemicalmethods，XRDandTEMtechniques．Themainresultsobtained1．ThePdcatalystsupportedonmultiwalledcarbonnanotubes(Pd／MWCNT)wasprepar

3、edthroughtheliquidphasereductionmethodanditselectrocatalyticactivityforborohydrideoxidationwasinvestigated．Comparedwithothercarbon—supportedPdcatalysts，thePd／MWCNTcatalystdemonstratedimprovedpolarizationpropertiesduetoitssmallerPdparticlesandbetterdispersionofcatalystparticles．Thehydrogenevoluti

4、onbehavioronthePd／activatedcarbonsamplewasfoundtobedependentontheconcentrationsofNaOHandNaBIG．Ontheotherhand，borohy’drideoxidationonPd／carbonblackandPd／MWCNTdisplayednear4ereactionmechanisms．2．Theelectro-oxidationofborohydrideoncarbon—supportedAuandAgWasstudied．Theresultssuggestthatthefueleffici

5、encyofborohydrideelectro—oxidationishi曲lydependentontheconcentrationratioof[OH‘]／[BTG-]．At【OH‘]／[BH4一】21，only3ereactionstoichiometrywasobtained．When【OH。]／[BIG-】Wasincreasedto2，thereactionWasmorethan4e．If【OH’]／[BIGqbecame5，thereactionwasfoundtobenear8e．Detailedcyclicvoltammetry(cv)studiesrevealth

6、atBH30H。isinvolvedinthe3ereactionwhen[OH’]／[BIG’】=1．Thenon一8ereactionstoichiometryoccurringonAuandAg，bothofwhichareinactiveforthechemicalhydrolysisreaction,suggeststhatthereexistsallinherentcompetitionbetweenOH。andH20duringborohvrdrideelectro-oxidation．IfOH’ionsarenotsufficientforeachBI-t4‘toacc

7、omplishthe8eelectro-oxidation，partofBIG’willreactsimultaneouslywithHEOtogenerateIIIAbstract浙江大学硕上学位论文hydrogen．3．ThehydrogenevolutionbehaviorsonNi、Pd／CandPt／Cwereexamined．ItwasfoundthattheanodicreactiononNiwasa4eprocess．Onthe