第 49 卷第 2 期Vol. 49 No. 2
2019 年 4 月Apr 2019
所属栏目：功能材料

Co3O4电极材料的制备及其电容性能研究
邹尔丽，杨佳欣，李欣茹，李艳华* （长沙学院 生物与环境工程学院，湖南 长沙 410022）
摘　要：采用水热法，通过控制反应时间制备出不同形貌和尺寸的Co3O4材料。利用XRD和SEM对其结构和形貌进行表征，采用循环伏安、恒电流充放电和交流阻抗等方法测试了其电化学性能。结果表明，随着反应时间的延长，Co3O4材料的晶粒尺寸增大，形貌由不规则颗粒状变为正立方体，其比电容不断降低。在电流密度为0.2 A·g-1时，反应5 h、10 h和15 h所制备的Co3O4材料的比电容值分别为153.3 F·g-1、99.3 F·g-1和51.1 F·g-1。当电流密度从0.2 A·g-1增大到1.8 A·g-1时，反应5 h、10 h和15 h所制备的Co3O4材料的比电容值分别为96.3 F·g-1、91.3 F·g-1和27.1 F·g-1，其比电容保持率分别为62.8%、91.9%和53.0%。水热反应5 h所制备的Co3O4材料具有最好的比电容。
关键词：超级电容器；Co3O4；水热法
中图分类号：O614.81　　文献标识码：A　　文章编号：1009-9212（2019）02-0053-05
Synthesis of Co3O4 Material and Its Capacitive Performance
ZOU Er-li, YANG Jia-xin, LI Xin-ru, LI Yan-hua* (College of Biological and Environmental Engineering, Changsha University, Changsha 410022, China)
Abstract：Co3O4 Materials with different morphologies and sizes were prepared by hydrothermal method through controlling the reaction time. The as-synthesized Co3O4 was characterized by X-ray diffraction and scanning electron microscopy. Electrochemical property of Co3O4 was carried out by cyclic voltammetry, galvanostatic charge-discharge and electrochemical impedance spectroscopy. The results showed that the crystallite size of Co3O4 materials increased with the increase of reaction time and their morphology changed from irregular particle to cube. The specific capacitance of Co3O4 materials decreased continuously when reaction time increased. When the current density was 0.2 A·g-1, the specific capacitance values of Co3O4 material synthesized with 5 h, Co3O4 material synthesized with 10 h, and Co3O4 material synthesized with 15 h were 153.3, 99.3 and 51.1 F·g-1, respectively. When the current density increased from 0.2 A·g-1 to 1.8 A·g-1, the specific capacitance values of Co3O4 material synthesized with 5 h, Co3O4 material synthesized with 10 h, and Co3O4 material synthesized with 15 h were 96.3 F·g-1, 91.3 F·g-1 and 27.1 F·g-1, respectively. Their specific capacitance retention rates were 62.8%, 91.9% and 53.0%, respectively. Co3O4 material prepared by hydrothermal reaction for 5 h showed the highest specific capacitance.
Key words：supercapacitors; Co3O4; hydrothermal method
基金项目：2017年度湖南省大学生研究性学习和创新性实验计划项目，2018年度长沙学院“大学生创新项目计划”。
作者简介：邹尔丽（1999-），女，湖南娄底人，研究方向：超级电容器电极材料研究。
联 系 人：李艳华，副教授，博士，研究方向：超级电容器电极材料研究（E-mail：liyanhua11@126.com）。
收稿日期：2018-04-05