介孔碳的石墨化改性与载pt后的电催化性能

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1、介孔碳的石墨化改性及载Pt后的电催化性能研究ABSTRACTMesoporousmaterialswhichhavebeenwidelyinvestigatedduetoits’highsurfaceareasandporevolumeaswellasorderedmesostructures,havepotentialapplicationsascatalysts,separationmedia,andadvancedelectronicmaterialsinmanyscientificdisciplines.Ourworkpivotsaroundmodifie

2、dmesoporousmaterialsascatalystsupportsfordirectmethanolfullcells.Carbonnanotubes/Orderdmesoporpussilicacomposites(CNTs/OMS)waspreparedbyusingCTABasnotonlyexceptionallydispersantofcarbonnanotubesintheaqueousphasebutalsoasanorganictemplatefordirectingtheformationofmesoporoussilica.Thisc

3、ompositesshowedhighlyconductivitybecauseofCNTsandcarbonfilmscoatedonorderdmesoporpussilicaaftercalcinedinnitrogenatmosphere.Ptnanoparticlesloadingonthecompositesdisplayedexcellentcatalyticperformanceandstabilityinsulfuricacid.Theelectrochemicalactivesurfacearea(EASA)ofthis2-1electroca

4、talystis120.9m·g.Mesoporouscarbon/carbonnanotubescompositesreplicatedfromtheabove-synthesizedCNTs/OMStemplatebyusingsucroseascarbonprecursors.X-raydiffraction(XRD)andtransmissionelectronmicroscope(TEM)showedthatthiscompositeshasadisorderedporestructures.Theconductivityofthosecomposite

5、sincreasedwiththeraisedmassrationofCNTs.Ptnanopaticalssupportedonthiscarboncompositeshowedhighelectrocatalyticactivity.Thepeak-2currentofmethanoloxidationbythiscatalystis80.3mA·cm,andtheelectrochemicalactive2-1surfaceareais110.9m·g,whichis2.02timesthanPt-MCcatalystthatwithoutCNTs.When

6、P123wasusedasorganictemplateforsynthesizedofCNT/OMSscomposite,orderedmesoporouscarbon/carbonnanotubesreplica(CNT/OMC)wasobtained.WefindedthattheadditionofappropriateCNThadnoeffectiontotheorderedmesoporousstructureofcarbon.Similartochapter3,theconductivityandplumbaginousdegreeofCNT/OMC

7、compositeishigherthanOMC,whichisbenefitforloadingwithPtnanoparticles.ThePt-CNT/OMCcatalysthavea2-1higherelectrochemicalactivesurfaceareaof114.8m·gthanPt-OMCcatalyst,whichindicatethattheadditionofappropriateCNTsinOMCcouldimprovetheperformanceofPtnanoparticles.Furthermore,graphiteoxidet

8、hatfu