電化學(xué)電容性能
(南京航空航天大學(xué) 材料科學(xué)與技術(shù)學(xué)院，南京 210016)
摘 要: 以苯甲酸功能化碳納米管為基底，制備Co(OH)2/苯甲酸化功能化碳納米管復(fù)合材料。苯甲酸官能團(tuán)在合成過(guò)程中發(fā)揮了雙重作用：既明顯改善碳納米管在去離子水中的分散性，又使得碳納米管管壁與Co2+表面結(jié)合能力大大加強(qiáng)。透射電子顯微鏡、掃描電子顯微鏡以及X射線衍射等表征表明，Co(OH)2在碳納米管上的分散性得到很大改善；電化學(xué)實(shí)驗(yàn)結(jié)果表明，該復(fù)合材料擁有優(yōu)良的電容行為，其比容量在電流密度為5 mA/cm2時(shí)達(dá)到322.3 F/g，較Co(OH)2/純化碳納米管復(fù)合材料以及純Co(OH)2電極高出100 F/g左右。實(shí)驗(yàn)結(jié)果表明，以苯甲酸功能化碳納米管為基底可以進(jìn)一步有效提高Co(OH)2的利用率。
關(guān)鍵字: 電化學(xué)電容器；苯甲酸功能化；碳納米管；氫氧化亞鈷
（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
