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

doi:10.3724/SP.J.1077.2013.13139

无机材料学报 ›› 2013, Vol. 28 ›› Issue (12): 1321-1327.DOI: 10.3724/SP.J.1077.2013.13139 CSTR: 32189.14.SP.J.1077.2013.13139

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

门春艳¹, 石琴¹, 李娟¹, 李清文²

(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)

收稿日期:2013-03-08 修回日期:2013-05-06 出版日期:2013-12-20 网络出版日期:2013-11-15
作者简介:门春艳(1988–), 女, 硕士研究生. E-mail:menchuny@163.com
基金资助:
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)

Growth of β-Co(OH)₂ Nanoflowers on Carbon Nanotube Papers and Its Electrochemical Capacitance Performance

MEN Chun-Yan¹, SHI Qin¹, LI Juan¹, LI Qing-Wen²

(1. College of Chemistry and Chemical Engineering, Xinjiang University, Urumqi 830046, China; 2. Suzhou Institute of Nano-tech and Nano-bionics, Chinese Academy of Sciences, Suzhou 215123, Jiangsu Province, China)

Received:2013-03-08 Revised:2013-05-06 Published:2013-12-20 Online:2013-11-15
About author:MEN Chun-Yan. E-mail:menchuny@163.com
Supported by:
Doctoral Scientific Research Staring Foundation of Xinjiang University (BS110112); National Natural Science Foundation of China (21162025)；Urumqi Science and Technology Project (H101133001)

摘要/Abstract

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3 μm。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/L KOH电解液中, 电流密度为2 A/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。

关键词: β-Co(OH)₂, 碳纳米管纸, 柔性电极, 比容量

Abstract: 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 material was pure brucite phase. Three dimensional (3D) loose nano-flowerlike structure with the diameter of about 3 μm 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)₂/CNT paper composite 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 composite performed an obvious improvement of rate capacity and cycling stability, compared with pure phase β-Co(OH)₂.

Key words: β-Co(OH)₂, carbon nanotube paper, flexible electrode, specific capacitance

中图分类号:

O646

门春艳, 石琴, 李娟, 李清文. 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[J]. 无机材料学报, 2013, 28(12): 1321-1327.

MEN Chun-Yan, SHI Qin, LI Juan, LI Qing-Wen. Growth of β-Co(OH)₂ Nanoflowers on Carbon Nanotube Papers and Its Electrochemical Capacitance Performance[J]. Journal of Inorganic Materials, 2013, 28(12): 1321-1327.

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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

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