wc%2f碳管纳米复合材料制备与电化学性能研究

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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