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以化学气相沉积(CVD)法生长的石墨烯作为基体,采用原位复合方法制备出三维石墨烯/碳纳米管纳米复合材料.使用扫描电子显微镜(SEM)和透射电子显微镜(TEM)对复合材料的微观形貌和结构进行表征,并运用循环伏安、交流阻抗等技术对纳米复合材料的超级电容性能进行研究.实验结果表明,石墨烯/碳纳米管纳米复合材料作为超级电容器电极材料,在1.5 mol/L Li_2SO_4体系中的最大比电容为289.8 F/g,经2000次循环后,其容量保持92%,表现出优异的比容量和循环稳定性.
The three-dimensional graphene / carbon nanotubes nanocomposites were prepared by in-situ composite method using graphene grown by chemical vapor deposition (CVD) as the matrix, and the composites were fabricated by scanning electron microscopy (SEM) and transmission electron microscopy The morphology and structure of the nanocomposites were characterized by cyclic voltammetry and AC impedance techniques.The experimental results show that the graphene / carbon nanotube nanocomposites as the electrode materials of supercapacitors, The maximum specific capacitance of 1.5 mol / L Li_2SO_4 system was 289.8 F / g. After 2000 cycles, its capacity was 92%, showing excellent specific capacity and cycling stability.