摘要
采用体积比为3∶1的浓硫酸和浓硝酸混合溶液对多壁碳纳米管进行表面氧化改性,利用场发射扫描电镜(FE--SEM)、比表面分析仪(BET)以及X射线光电子能谱(XPS)等手段分析了酸处理前后多壁碳纳米管的形貌、比表面积和表面官能团,利用循环伏安测试和充放电测试分析了酸处理前后多壁碳纳米管的电化学性能.结果表明,通过酸氧化改性,多壁碳纳米管的管长变短,比表面积增加,表面含氮和含氧官能团增加,从而导致其电化学性能大幅度地提高,在1 mol.L-1的硫酸电解液中比电容从7 F.g-1增加到66 F.g-1.
The modification of multi-walled carbon nanotubes（MWCNTs） was carried out with a mixed acid of concentrated sulfuric acid and nitric acid at a volume ratio of 3∶1.The morphology,specific surface area and surface functional groups of the resulting MWCNTs were analyzed by field emission scanning electron microscopy（FE-SEM）,surface area analysis and X-ray photoelectron spectroscopy（XPS）,respectively.The electrochemical properties of the MWCNTs were studied by cyclic voltammetry and galvanostatic charge-discharge tests.The results indicate that after oxidation by acid,the lengths of the MWCNTs are shortened,and the specific surface area is enlarged and the contents of surface nitrogen-and oxygen-containing functional groups increase.This leads to the enhancement of electrochemical properties of the MWCNTs,and the specific capacitance of MWCNTs can increase from 7 F·g-1 to 66 F·g-1.
出处
《北京科技大学学报》
EI
CAS
CSCD
北大核心
2011年第11期1387-1390,共4页
Journal of University of Science and Technology Beijing
基金
国家自然科学基金资助项目(50873015)
北京市科技新星计划资助项目(2007B026)
教育部新世纪优秀人才支持计划资助项目(NCET-08-0724)
霍英东青年教师基金资助项目(112020)
中央高校基本科研业务费专项资金资助项目(FRF-TP-09-007A)
关键词
超级电容器
碳纳米管
表面处理
改性
储能
官能团
supercapacitors
carbon nanotubes
surface treatment
modification
energy storage
functional groups
