【摘要】 为了提高纳米碳管电极在电化学双电层电容器(EDLC)中的电化学性能,研究了球磨处理对高纯度多壁纳米碳管(MWNT)束电极电化学容量的影响.将球磨处理前后的两种MWNTs分别制作成电极,并组装成模拟EDLC,利用循环伏安法和恒流充放电法,测试MWNT电极的电化学可逆容量.研究结果表明,MWNT粗产品的纯度达到了97%以上.经过3 h的球磨处理后,大多数MWNTs束被打散或打断,其比表面积由球磨前的238 m2/g提高到了340 m2/g.用MWNTs制备的EDLC电化学容量由球磨前的36 F/g提高到了72 F/g.与球磨前的MWNTs束相比,球磨后的样品更适合作为EDLC电极材料.更多还原

【Abstract】 To enhance the electrochemical properties of electrochemical double-layer capacitors(EDLC) based on carbon nanotubes electrodes,effects of ball milling on electrochemical capacitances of high purity multiwalled carbon nanotube(MWNT) bundles were investigated.Two kinds of MWNTs before and after milling were fabricated as electrodes,and the simulated EDLC were assembled.The reversible electrochemical capacitance of MWNT electrodes were measured using the cyclic voltammetry and constant current charge/discharge methods.Research results indicate that the purity of the raw MWNTs reach to more than 97%.After 3 h ball milling,most of the MWNT bundles scatter or break,and the specific surface area of the bundles increases from 238 m~2/g to 340 m~2/g.The capacitance of EDLC prepared by MWNT electrodes changes from 36 F/g to 72 F/g.Compared with the MWNT bundles before milling,the milled carbon nanotubes are more suitable as electrode materials for EDLC.更多还原