α-Co(OH)_2的制备及其超级电容特性

Preparation and Electrochemical Capacitance of α-Co(OH)_2 for Supercapacitors

以氯化钴为原料,聚乙烯吡咯烷酮(PVP)为分散剂,采用化学沉淀的方法制备出由纳米粒子组成的片状α-Co(OH)2.用红外光谱对所制样品的组分进行分析,用X射线衍射和场发射扫描电子显微镜表征产物的结构和形貌,用循环伏安和恒电流充放电等测试方法对其电化学性能进行研究.研究结果表明,由纳米粒子组成的片状α-Co(OH)2表现出优良的电化学性能,单电极比电容高达1220 F/g.

The sheet-like α-Co（OH）2 composed of the uniform nanoparticles was successfully prepared using cobalt chloride as the raw material and polyvinyl pyrrolidone as the dispersant by chemical precipitation method.The components of products were analyzed by FTIR and the structure and morphology were characterized by X-ray diffraction（XRD） and field emission scanning electron microscopy（FESEM）,respectively.The electrochemical performances were investigated by cyclic voltammetry and constant current charge/discharge techniques.The test results show that an extraordinary high specific capacitance value of 1220 F/g is achieved,and the α-Co（OH）2 is a promising electrode material for supercapacitor.