碳纳米管掺杂MnO_2电极的电化学行为  

Electrochemical behaviors of carbon nanotubes doped MnO_2

作　　者：陈野[1] 张巍[1] 张尊波[1] 

机构地区：[1]哈尔滨工程大学材料科学与化学工程学院,黑龙江哈尔滨150001

出　　处：《现代化工》2008年第7期57-59,共3页Modern Chemical Industry

基　　金：教育部博士点基金(20050217019)资助

摘　　要：采用化学沉淀法制备MnO2并用L4060型多壁碳纳米管对其进行掺杂。用XRD与SEM测试对样品进行表征,结果表明产物为α-MnO2和γ-MnO2的混合物,掺杂前微观团聚成絮状,掺杂后可以明显看到管状结构贯穿其中。通过循环伏安、恒流充放电和交流阻抗测试样品的电化学性能,结果表明掺杂量为5%时样品的电容特性最好,其放电比容量为349F/g,比掺杂前提高了77.27%,掺杂后样品的等效串联电阻(RESR)和反应电阻(RE)分别下降了58.14%和47.37%。MnO2 is synthesized by the chemical deposition method then doped with L4060 multiwall carbon nanotubes （ CNTs）. The structure of the samples is characterized by X-ray and the microcosmic appearances of the samples are imaged by SEM.The results show that the product is a mixture of α-MnO2 and γ-MnO2, and the sample before CNTs doped resembles flocculent in appearance but pipes run through obviously after treated. The electrochemical performance of the samples are measured by cychc voltammetry, constant current and A. C impendence. The results of electrochemical tests show that the sample with 5 % of CNTs doped has the best capacitance performance; discharge specific capacitance of MnO2 before/after CNTs doped is 202 F/g and 349 F/g respectively,advance by 77.27% ;impedance characteristic is improved, RESR and RE can decline by 58.14% and 47.37% respectively after CNTs doped.

关 键 词：超级电容器 MNO2 碳纳米管 掺杂 电化学性能 

分 类 号：TM53[电气工程—电器]