新型炭材料2021，Vol.36Issue(4)：835-842,8.DOI:10.1016/S1872-5805(21)60086-0
多壁碳纳米管的裁剪及其电容性能研究
Conversion of carbon nanotubes into curved graphene with improved capacitance
摘要
Abstract
Multi-wall carbon nanotubes (MWCNTs) have achieved mass production, but their lengths are in the millimeter range, which is unfavorable for the diffusion of electrolyte ions into their innermost tube. We report an oxidation method to simultaneously cut and unzip MWCNTs along transverse and longitudinal directions, which leads to the formation of curved graphene sheets (CGSs). SEM shows that the curved morphology was retained but the diameters were large after unzipping. This could be caused by the interaction of oxygen-containing functional groups between layers on the edges of the CGSs. Because of the larger number of act-ive sites the specific capacitance is improved. To further increase the capacitive performance, a sample was put into a 0.1 mol L?1 KMnO4 to incorporate MnO2. The microstructure of the resulting CGS-MnO2 hybrid was revealed by electron microscopy, Raman spectroscopy and powder X-ray diffraction. The results indicate that amorphous MnO2 successfully grew on the surface of the CGSs. The capacitive behavior was measured by cyclic voltammetry in a 1 mol L?1 Na2SO4 solution. The CGS-MnO2 had a specific capacit-ance of 236 F g?1 at 2 mV s?1 (even 127 F g?1 at 100 mV s?1), which is superior to that of MWCNTs (15 F g?1), CGS (88 F g?1) and MWCNT-MnO2 (111 F g?1). In addition, excellent cycling performance was achieved for the CGS-MnO2 hybrid electrode with a 97％ capacitance retention over 1000 cycles.关键词
多壁碳纳米管/弯曲石墨烯/裁剪/超级电容器Key words
Multi-walled carbon nanotubes/Curved graphene/Unzipping/Supercapacitor分类
化学化工引用本文复制引用
李小燕,王强,王欢文..多壁碳纳米管的裁剪及其电容性能研究[J].新型炭材料,2021,36(4):835-842,8.基金项目
The work was supported by the National Natural Science Foundation of China (21872162) and the CAS Key Laboratory of Carbon Materials (KLCMK-FJJ2009). 基金项目:国家自然科学基金(21872162) （21872162）
中国科学院炭材料重点实验室开放基金(KLCMKFJJ2009). （KLCMKFJJ2009）
