苯甲酸修饰碳纳米管的制备及其负载Co(OH)_2的电化学电容性能  

Preparation and electrochemical capacitive performance of Co(OH)_2/benzoic acid functionalized carbon nanotubes

作　　者：高博[1] 陈胜尧[1] 傅清宾[1] 原长洲[1] 张校刚[1] 

机构地区：[1]南京航空航天大学材料科学与技术学院,南京210016

出　　处：《中国有色金属学报》2009年第9期1642-1648,共7页The Chinese Journal of Nonferrous Metals

基　　金：国家重点基础研究发展计划资助项目(2007CB209703);国家自然科学基金资助项目(20403014;20633040;20873064);南京航空航天大学研究生创新基金资助项目(BCXJ08-08)

摘　　要：以苯甲酸功能化碳纳米管为基底,制备Co(OH)2/苯甲酸化功能化碳纳米管复合材料。苯甲酸官能团在合成过程中发挥了双重作用:既明显改善碳纳米管在去离子水中的分散性,又使得碳纳米管管壁与Co2+表面结合能力大大加强。透射电子显微镜、扫描电子显微镜以及X射线衍射等表征表明,Co(OH)2在碳纳米管上的分散性得到很大改善;电化学实验结果表明,该复合材料拥有优良的电容行为,其比容量在电流密度为5mA/cm2时达到322.3F/g,较Co(OH)2/纯化碳纳米管复合材料以及纯Co(OH)2电极高出100F/g左右。实验结果表明,以苯甲酸功能化碳纳米管为基底可以进一步有效提高Co(OH)2的利用率。An effective method to synthesize structurally uniform Co（OH）2/f-MWCNTs composite was described by using benzoic acid functionalized MWCNTs as substrate.Benzoic acid group is bifunctional both for solubilizing MWCNTs into deionized water and for tethering Co2＋ precursor onto MWCNTs surfaces to facilitate the follow-up chemical deposition of Co（OH）2 by supplying surface binding and anchoring sites.The composite has a uniform surface dispersion and large coverage of Co（OH）2 onto f-MWCNTs, which is characterized by XRD, TEM, SEM.Electrochemical tests demonstrate that the Co（OH）2/f-MWCNTs composite possesses good electrochemical capacitive performance and delivers higher capacity of 322.3 F/g at 5 mA/cm2, which exceeds about 100 F/g higher than Co（OH）2/p-MWCNTs and pure Co（OH）2.The presented work implies that using f-MWCNTs as substrate is an effective approach to enhance the utilization of Co（OH）2.

关 键 词：电化学电容器 苯甲酸功能化 碳纳米管 氢氧化亚钴 

分 类 号：O614.812[理学—无机化学]