超级电容器材料纳米Co_3O_4的固相法制备及电化学性能  

Solid reaction preparation and electrochemical characteristics of nano-structured Co_3O_4 material for supercapacitor

作　　者：袁安保[1] 章庆林[1] 

机构地区：[1]上海大学理学院化学系,上海200444

出　　处：《功能材料与器件学报》2007年第1期1-6,共6页Journal of Functional Materials and Devices

摘　　要：以CoC l2.6H2O和NH4HCO3为原料,通过室温固相反应得到前驱体,将前驱体于350℃、空气氛中煅烧3 h,氧化分解得到Co3O4样品。X射线衍射(XRD)、透射电镜(TEM)和红外光谱(IR)分析表明,所得样品为纳米级立方尖晶石相Co3O4。循环伏安和交流阻抗测试结果表明,Co3O4电极在6mol.L-1KOH水溶液中具有可逆的法拉第反应特性和较好的动力学性能。恒电流充放电结果表明,以Co3O4电极为正极、活性炭(AC)电极为负极、6mol.L-1KOH水溶液为电解质组成的碱性Co3O4/AC混合电容器具有较好的大电流充放电性能和循环稳定性。Co3O4 material was prepared by calcination in air atmosphere at 350°E for 3 h of a precursor that obtained previously from room -temperature solid reaction using CoCl2·6H2O and NH4HCO3 as raw materials. X -ray diffraction （XRD）, transmission electron microscope （TEM） and infrared spectroscopy （IR） analysis results indicate that the obtained sample is nano -structured cubic spinel Co3O4. Cyclic voltammetry and AC impedance results show that the Co3O4 electrode exhibits reversible Faraday reaction characteristic and good kinetic property in 6mol · L^-1 potassium hydroxide aqueous solution. Galvanostatic charge/discharge results demonstrate that the alkaline Co30JAC hybrid capacitor using Co3O4 as positive electrode and activated carbon as negative electrode and 6mol · L^-1 KOH as electrolyte exhibit better charge/discharge performance and cyclic stability at high current densities.

关 键 词：纳米Co3O4 固相反应 活性炭 混合超级电容器 准电容 

分 类 号：TM911[电气工程—电力电子与电力传动]