研究生英语文献汇报市公开课一等奖省赛课获奖课件

1PaperReview

李俊乾化学工程（专）14102932SynthesisofbimetallicPt/Pdnano-tubesandtheirenhancedcatalyticactivityinmethanolelectro-oxidation（双金属铂/钯纳米管合成和其在甲醇电氧化增强催化活性）第1页2Literaturesource第2页3ContentsIntroduction12

Experimentalsection1Conclusions234Resultsanddiscussion第3页41.IntroductionTheshortageoftraditionalenergyresourcesandseriousenvironmentalpollutionduetocombustionemissionshaveresultedinanumberofscientificstudiesonthedevelopmentofsustainableandcleanenergy,includingfuelcells.第4页51.IntroductionMethanoloxidationinadirectmethanolfuelcell(DMFC)cangenerateelectrochemicalenergy.DMFC’Sworkingprinciple:CathodePolymerAnodemembraneCO2H2OH2OCO2H2OO2H+：CH3OHe-e-Loadinge-CathodecatalystAnodecatalystWasteheatAnode：CH3OH+H2O

CO2+6H+

+6e-φ0=0.046VCathode：3/2O2+6H++6e-

3H2Oφ0=1.229V

CH3OH+3/2O2

CO2+2H2OE0=1.183V第5页Thisoxidationusuallyneedsacatalysttolowerthereactionbarriertomaketheprocessefficient.Sofar,platinum(Pt)isthemostefficientcatalystinthefield.ScarcityofPt,whichcausesitshighcost,inevitablyimpedestheactivedevelopmentofbothscientificresearchandpracticalutilization.Theutilizationofsingle-componentPtinDMFCssuffersfromseriouscarbonmonoxide(CO)poisoning.CO,oneofthemainintermediatemolecules,caneasilystainPtatoms,whichdeterioratestheircatalyticactivity.6Thearticlethought：Inthisstudy,weachievedhighercatalyticactivityformethanoloxidationusingtheperpendicularbimetallicPt/PdNTarrayasacatalyst.TheinvestigationofthecatalyticpropertiesofbimetallicmaterialspavesawaytosubstitutingexpensivePtwithcost-competitivematerialsinthefuture.第6页7

Experimentalsection2第7页82.Experimentalsection5mMPdCl25mMH2PtCl640mMHClusedfordepositionThelengthsoftheNTscanbecontrolledbyusing0.3to2C.AAOavertically-alignedbimetallicPt/PdnanotubearrayScheme1Schematicdrawingoftheiondistributioninaporousaluminanano-template.DashedlinesshowtheelectricaldoublelayeroftheclassicalGouy–Chapman–Stern'smodelbetween(b)diffusionlayerand(c)bulklayerregionsinananochannel.Region(a)depictsacompactlayer.第8页923Resultsanddiscussion第9页103.ResultsanddiscussionTheaverageouterdiameterandwallthicknessofthePt/PdNTsweremeasuredas217(39nm)and37(12nm),respectively.AsshownintheSEMimages,theresultingmorphologyofthenanostructureswasquitehomogeneousoveralargeareaofthesample.SynthesisofbimetallicPt/Pdnano-tubesandmorphologyanalysis第10页113.ResultsanddiscussionAsthePt/Pdratioincreased(i.e.,theproportionofPt4+increased),thenanostructuresbecamerodshapes.AsthePt/Pdratiodecreased(i.e.,theconcentrationofPd2+increased),thenanostructuresgraduallystartedtoshowanopennano-tubular(ONT)shape.第11页123.ResultsanddiscussionWhen5mMPdand5mMPtprecursorionswereintheplatingsolution,Pt49/Pd51NTscouldbepreparedAplotofatomic%ofPtinPt/Pdbimetallicnanostructuresvs.amountofPtsource第12页133.Resultsanddiscussion(A)TEMimageofPt/PdNTswith1C(2.40.4mm)showsthetotallytubularstructurefrombottomtotop.(B)TEMimageofaPt/PdNTandline-scanningprofilesintheradialdirection,indicatingPt(redtrace)andPd(greentrace)distributions.Thecorrespondingelementalmappingimagesareshownfor(C)Ptand(D)Pd.第13页143.ResultsanddiscussionFE-SEMimages(BSEmode)ofthePt/PdNTs.ThelengthsofthePt49/Pd51NTsweretunedbyusing(A)0.3C,(B)1Cand(C)2C.(D)ThePt/PdNTshaveaveragelengthsfrom1.1±0.1mmto4.9±0.9mm.第14页153.Resultsanddiscussion返回Electro-catalyticproperties(A)Cyclicvoltammograms(CVs)ofPtand/orPdnanostructureswithsamelengths(ca.2.4mm)in0.5MH2SO4solutionatroomtemperature.AsshowninFig.A,thevalueofthesurfacechargeofthePt/PdNTcatalystswasfoundtobe1.7timeslargerthanthatofthePt/PdNRs.第15页163.Resultsanddiscussion(B)AnodicstripingofCOoxidationin0.5MH2SO4aqueoussolutionfordifferentcatalysts(onlytheoxidativeCOremovalregionisshown).TheobservedpeakintensityofCOoxidationonthePt/PdNRswastwotimeshigherthanthatofthepurePtandPdNRs.Interestingly,theonsetpotentialofCOoxidationforthePt/Pdbimetallicnanostructures(0.61V)appearedatalowerpotentialcomparedtothepurePtNRs(0.69V)andthepurePdNRs(0.79V).第16页173.Resultsanddiscussion(C)Cyclicvoltammogramsofmethanoloxidationusingdifferentcatalysts.TheinsetimageshowsthemagnifiedonsetpotentialregionoftheCVs.TheJf/JbratiosofthePt/PdNTsandPtNRsweredeterminedtobe1.6and1.2,respectively.TheVonsetwasfoundtobeintheorder:Pt/PdNTs(0.42V)<Pt/PdNRs(0.44V)<PtNRs(0.49V)第17页183.Resultsanddiscussion(D)Comparisonofchronoamperogramsofmethanoloxidationfordifferentcatalystsat0.4V(vs.Ag/AgC