溶剂热法合成玉米棒状Co_3O_4及其电化学电容性能  

Electrochemical Capacitance Characteristics of Corn-like Co_3O_4 Nanorods Prepared by Solvothermal Method

作　　者：刘亚威[1,2] 张昌远[1] 赵雯雯[1,2] 黄祥平[1,2] 毛峰[1] 杨学林[2] 樊帅伟[1] 

机构地区：[1]三峡大学理学院,湖北宜昌443002 [2]三峡大学新能源研究院,湖北宜昌443002

出　　处：《三峡大学学报（自然科学版）》2012年第5期103-107,共5页Journal of China Three Gorges University：Natural Sciences

基　　金：国家自然科学基金(50972075);国家自然科学基金面上项目(11174179);宜昌市科技局项目(A2010-302-15);三峡大学研究生科研创新基金(2011CX081)

摘　　要：采用溶剂热法制备了玉米棒状的Co3O4.借助X射线衍射仪(XRD)、扫描电子显微镜(SEM)等对Co3O4的结构和形貌进行了表征,结果表明,产物由Co3O4纳米颗粒构成,并形成明显的棒状结构.循环伏安法、恒流充放电及循环寿命等电化学测试表明,所得Co3O4电极在4mol.L-1电解液中具有较好的电化学电容特性,0.5A.g-1电流密度下的单电极比容量可达310.5F.g-1,且经700次循环后,比电容衰减约为10%,库仑效率接近100%.Corn-like Co3O4 nanorods were prepared by the solvothermal method at 180℃, followed by heating to 550℃ in air. The samples were investigated by X-ray diffraction and scanning electron microscopy. The results show that the as-synthesized Co3O4, nanorods which consists of nanoparticle. Electrochemical properties of the Co3O4 nanorods were elucidated by cyclic voltammetry, galvanostatic charge-discharge in 4 mol L 1 KOH electrolyte. Electrochemical data analysis demonstrates that the as-prepared Co3O4 electrodes have a good capacitive behavior and cyclability due to its unique structure and display a specific capacitance of 310.5 F g-1 at a current density of 0. 5 A g-1. The capacitance loss is about 10% after 700 charge- discharge cycles. The columbic effieiency is close to 100%. Keywords

关 键 词：四氧化三钴 溶剂热法 玉米棒状 超级电容器 

分 类 号：O646.1[理学—物理化学]