电化学电容性能
(南京航空航天大学 材料科学与技术学院，南京 210016)
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5 mA/cm2时达到322.3 F/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100 F/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。
关键字: 电化学电容器；苯甲酸功能化；碳纳米管；氢氧化亚钴
（College of Materials Science and Technology, Nanjing University of Aeronautics and Astronautics,
Nanjing 210016, China）
Abstract: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.
Key words: electrochemical capacitor; benzoic acid functionalized; carbon nanotube; cobalt hydroxide
