炭/多壁碳纳米管复合材料的制备与超级电容性能

Synthesis and Capacitive Properties of C /MWCNTs Composites

结合环糊精包覆和热处理技术制备了炭/多壁碳纳米管(C/MWCNTs)复合材料,并研究其应用于超级电容器的性能.利用扫描电子显微镜、透射电子显微镜、X射线衍射和拉曼光谱等技术对C/MWCNTs复合材料的形貌及结构进行分析.采用循环伏安和恒流充放电等电化学测试方法研究其电容特性.结果表明,C/MWCNTs复合材料具有良好的电化学性能,远优于相应的炭及MWCNTs样品.在1 A/g电流密度下,比电容可达到145 F/g,循环3000次后,容量无明显衰减.

Carbon/multi-wall carbon nanotubes （C/MWCNTs） composites were synthesized by combination of cyclodextrin wrapping and heat treatment techniques. The application of composites as electrode material for supercapaeitors was also demonstrated. The morphology and structure of the composites were characterized by scanning electron microscopy （SEM） , transmission electron microscopy （ TEM）, X-ray diffraction （XRD） and Raman spectra. The capacitive behavior of the composites was investigated static charge-discharge measurements. The experimental results show that by cyclic vohammetry and galvano the as-prepared composite exhibits better electrochemical performances than corresponding C and MWCNTs samples. The specific capacitance can reach to 145 F/g, and has no obvious decrease after 3000 cycles at 1 A/g. The results indicate that the effec tive combination of MWCNTs with other materials is useful for designing the advanced electrode material for supercapacitors.