三维石墨烯/碳纳米管复合材料及其超级电容器应用

Three dimensional graphene/carbon nanotube composite material and applications in supercapacitor

以化学气相沉积法,利用硅藻土作为天然催化剂,制备出三维石墨烯/碳纳米管复合材料,通过扫描电子显微镜(SEM)、透射电子显微镜(TEM)和比表面及孔径分析(BET)等方法对材料的形貌和孔径分布进行表征。研究了复合材料在1 mol/L H_2SO_4电解液中的超级电容器电化学性能。循环伏安测试结果表明,在扫描速率为2m V/s时,三维石墨烯/碳纳米管复合电极在1 mol/L H_2SO_4电解液中的比电容达到110 F/g。50 m V/s扫描速率下,复合电极稳定循环10000次容量保持稳定。

Three-dimensional(3D)/carbon nanotube composite materials were fabricated by chemical vapor deposition method using diatomite as templates. The morphology,surface area and pore size distribution of the 3D graphene/carbon nanotube composite materials were investigated by scanning electron microscopy,transmission electron microscopy and brunauer-emmett-teller measurement(BET),respectively. The electrochemical properties of the supercapacitor in H2SO4 electrolyte were evaluated by cyclic voltammetry(CV) techniques. It was found that the supercapacitor exhibited an outstanding specific capacitance value of 110 F/g in 1 mol/L H2SO4 electrolyte at a scan rate of 2 m V/s,and the capacitors stay stable with 10 000 cycles at 50 m V/s。