聚苯胺改性氮掺杂碳纳米管制备及其超级电容器性能.pdf

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1、物理化学学报(WuliHuaxueXuebao)JanuaryActaPhys．一Chim．Sin．2013，29(1)，111-116ll1[Article]doi：10．3866／PKU．WHXB201211091www．whxb．pku．edu．cn聚苯胺改性氮掺杂碳纳米管制备及其超级电容器性能李莉香陶晶耿新安百钢(辽宁科技大学化工学院，材料电化学研究所，辽宁鞍山114051)摘要：利用苯胺原位化学聚合合成聚苯胺包覆碳纳米管(CNTs)，再炭化处理制备氮掺杂碳纳米管(NCNTs)．激光拉曼(Raman)光谱和X射线

2、光电子谱(XPS)分析及透射电镜(TEM)观察表明，苯胺包覆碳纳米管经炭化处理后，得到以碳纳米管为核、氮掺杂碳层为壳，具有核．壳结构的氮掺杂碳纳米管，而碳纳米管本征结构未遭破坏．研究表明，随着苯胺用量的增大，氮掺杂碳纳米管的氮掺杂碳层变厚，氮含量从7．06％(质量分数)增加到8．64％，而作为超级电容器电极材料，随着氮掺杂碳层厚度降低，氮掺杂碳纳米管在6mol·氢氧化钾电解液中的比容量从107F·g增大到205F·g～，远高于原始碳纳米管10F·g。的比容量，且聚苯胺改性氮掺杂碳纳米管表现出较好的充放电循环性，经1000

3、次充放电循环后仍保持初始容量的92．8％一97．1％，表明氮掺杂碳纳米管不仅通过表面氮杂原子引入大的法拉第电容和改善亲水性使电容量显著增大，其具有的核壳结构特征也使循环稳定性增强．关键词：碳纳米管：氮掺杂：聚苯胺；超级电容器中图分类号：0646PreparationandSupercapacitOrPerformanceofNitrogen-DopedCarbonNanotubesfromPolyanilineModificationLlLi-XiangTAOJingGENGXinANBai—Gang(Institute

4、ofMaterialsElectrochemistryResearch，SchoolofChemicalEngineering,UniversityofScienceandTechnologyLiaoning,Anshan114051，LiaoningProvince,PR．China)Abstract：Nitrogen．dopedcarbonnanotubes(NCNTs)werepreparedbycarbonizationofpolyaniline-coatedCNIsthatweresynthesizedbyin

5、situpolymerizationofanilineontheCNTsurface．ThelaserRamanspectroscopy,transmissionelectronmicroscope(TEM)，andX—rayphotoelectronspectroscopy(XPS)indicatedthatcarbonizationtreatmentofthepolyaniline(PANI)coatedCNTsproducedNCNTsowningthecore．shelIstructureofanitrogen—

6、dopedcarbonshelJandaCNTcore．withoutdestroyingtheIntrinsicCNTstructure．Byincreasingtheanilineamount，theN-dopedlayeroftheNCNTsbecamelhicker，andtheamountofnitrogendopingincreasedfrom7．06％to8．64％(massfraction)．Asthesupercapacitorelectrodemateria1．theNCNTscapacitancei

7、n6moI．L‘aqueousKOHsolutionincreasedfr0m1O7to205F·g～astheN．dopedlayerthicknessdecreased．whichwasmuchhigherthanthecapacitanceof10F·g一’forthepristineCNTs．Especialy，NCNTelectrodesdisplayedgoodcyclability，maintaining92．8％-97．1％Oftheinitialcapacitanceafter1000charge—di

8、schargecycles．ThehighcapacitanceandgoodcyclabilityoftheNCNTsasasupercapac_l0relectrodemateriaIcanbeattributedtothepseudo-Faradiccapacitanceandimprovedhydrophil