碳纳米管纸上β-Co(OH)_2纳米花的生长及其电化学电容行为  

Growth of β-Co(OH)_2 Nanoflowers on Carbon Nanotube Papers and Its Electrochemical Capacitance Performance

作　　者：门春艳[1] 石琴[1] 李娟[1] 李清文[2] 

机构地区：[1]新疆大学化学化工学院,乌鲁木齐830046 [2]中国科学院苏州纳米技术与纳米仿生研究所,苏州215123

出　　处：《无机材料学报》2013年第12期1321-1327,共7页Journal of Inorganic Materials

基　　金：新疆大学博士基金(BS110112);国家自然科学基金(21162025);乌鲁木齐科技计划(H101133001)~~

摘　　要：通过水热法制备了粘附于导电碳纳米管(CNT)纸表面生长的层级花状β-Co(OH)2,并将其作为电化学电容器高性能柔性复合电极材料。用X射线衍射(XRD)和扫描电子显微镜(SEM)表征了产物的微观结构和形貌。所得材料为三维疏松分层纳米花结构的β-Co(OH)2/CNT纸复合材料,其直径约为3μm。通过循环伏安法、恒电流充放电和交流阻抗等测试手段研究了该柔性材料的电容性能,结果表明:该复合材料在6 mol/LKOH电解液中,电流密度为2A/g时比容量达到2764 F/g;碳纳米管纸赋予了复合材料优良的导电性和柔韧性,同时β-Co(OH)2的层级花状结构利于活性物质与电解液之间的接触,因此,复合材料与纯的β-Co(OH)2相比,倍率容量和循环性能都得到明显改善。Uniform hierarchical flower-like β-Co（OH）2 anchored on conducting carbon nanotube （CNT） papers were successfully synthesized by hydrothermal method, which could be served as flexible electrode material for high-performance electrochemical capacitors. The structure, morphology and properties of the products were studied by X-ray diffraction （XRD） and scanning electron microscope （SEM）. The results indicated that the as-prepared mate- rial was pure brucite phase. Three dimensional （3D） loose nano-flowerlike structure with the diameter of about 3 gm were stacked by multilevel β-Co（OH）2 flakes. Electrochemical performances of this flexible paper-like electrode were investigated by cyclic voltammetry, galvanostatic charge-discharge and electrochemical impedance spectroscopy test in 6 mol/L KOH aqueous electrolyte. Electrochemical data indicated that the interesting β-Co（OH）jCNT paper com- posite delivered a considerable specific capacitance of 2764 F/g at current density of 2 A/g. The CNT paper acted as a good conductive and flexible substrate for the composite electrodes in supercapacitors, and the hierarchical flower-like structure of the β-Co（OH）2 could facilitate the contact of the electrolyte. The β-Co（OH）2 nanoflower com- posite performed an obvious improvement of rate capacity and cycling stability, compared with pure phase β-Co（OH）2.

关 键 词：β-Co(OH)2 碳纳米管纸 柔性电极 比容量 

分 类 号：O646[理学—物理化学]