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ID:32371182
大小:2.34 MB
页数:68页
时间:2019-02-03
《wc%2f碳管纳米复合材料制备与电化学性能研究》由会员上传分享,免费在线阅读,更多相关内容在学术论文-天天文库。
1、研仁工量土学硬士学位论文ABSTRACTTungstencarbidebearsananalogyofthecatalyticcapabiliWofnoblemetal,e.g.Pt,andhigherabilityt0resistverys招ongcatalyticpoisons.butitscatalyticactivityismuchlowerthanthatofnoblemetal.Howtoimproveitscatalyticactivityisoneofthedifficultpointsa
2、ndthehottopicsinrecentyears.Inordertofindanapproachtosolvethisproblem,tungstencarbide/carbontubenanocompositionwaspreparedthroughcombinationsurfacedecorationwithinsitureductionandcarbonization.ThesampleswerecharacterizedbyFTIP,,XRD,EDS,SEM,TEM,HRTEM,andBE
3、T,respectively.ItselectrocatalyticactivityWastestedbypowder-microelectrodemainly.Inthefirstchapter,theStructuI七andpreparationofWC,andtheapplicationofcarbonnanotubeweresimplystated,andtheinthesecondchapter,theexperimentalprocesswasintroduced.Inthethirdchap
4、ter,thepreparationoftungstencarbide/carbontubellanocompositeWasinvestigated.Firstly,therawcarbonnanotubeWasmodifiedinnitricacidsolution,whichreactingtemperatureis150‘Candreactingtimeis4h.Secondlgammoniummetatungstate(AMT)Wasreactedwiththemodifiedcarbonnan
5、otubestop1.epareCNTAV03.Thereactingtemperatureis90"Candreactingtimeis8h.Atlast,tungstencarbide/carbontubesnanocompositeWaspreparedbyatechniqueofgas-solidreaction.Thepropertyandstructureoftungstencarbidewillbeaffectedbyitspreparingconditions.Theoptimalcoal
6、itions,asourexperimentsconsidered,ofthesamplepreparationarc:decompositiontemperature350--500℃,reactiontemperature650~850"C,reactionpressure8cm2H20,reactiontime7.5-12h.TheresultsofXRD,EDS,SEM,TEM,andHRTEMshowthatthesampleiscomposedofCNT、WC、WCx、Wls04,andthe
7、morphologyoftheparticlesoftungstencarbideisnanoscaleirregular,withadiameterofsamllerthan30nm,andWCgranulesdistributeonthesurfaceofcarbonnanotubehomogenously.Intheforthchapter,theelectrocatalyticactivityofthenanocompositefor英文摘要p-niU'ophcnolreductionandmet
8、hanoloxidationwastestedbymicro-powderelectrode.Theresultsimplythattheelectrocatalyticactivityofthecompositeforp-ni缸'ophenolreductionishigherthanthatofCNTandtungstancarbidewithmesoporosity.Andtheelectrocatalyticactiv
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