Co_3O_4电化学电容电极材料的制备及性能研究

Preparation and performance of Co_3O_4 as electrode material for electrochemical capacitor

利用水热法,以硝酸钴为原料,分别以碳酸氢铵、六次甲基四胺为沉淀剂,制备了Co3O4。借助X射线衍射、扫描电子显微镜手段对样品进行表征。以六次甲基四胺为沉淀剂制得的Co3O4,在6 mol.L-1KOH水溶液中,电位窗口为0～0.4V内,通过循环伏安和恒流充放电测试,显示该材料制备的电极具有良好的电容行为。充放电流在为5 mA时,单电极的比容量达到239 F.g-1,是以碳酸氢铵为沉淀剂制得的Co3O4电极的1.57倍,说明以六次甲基四胺为沉淀剂制备的Co3O4具有较好的电化学电容性能。

The Co3O4 materials have been synthesized via hydrothermal method,using sucrose as cobaltous nitrate [Co（NO3）3],hexamethylenetetramine（C6H12N4） and ammonium acid carbonate（NH4HCO3）.The physical properties of CO3O4 powders were characterized by X-ray diffraction（XRD）,scanning electronic microscopy（SEM）.The electrochemical properties of CO3O4 powders were characterized by cyclic voltammogram and galvanostatic charge/discharge measurements in 6mol·L-1 KOH electrolyte with the potential range from 0.0 to 0.4V（vs.SCE）.The results demonstrated that the CO3O4 by C6H12C4 for the precipitation agent had a good stability performance.Its specific capacitance as single electrode was up to 239 F·g-1,that is 1.57 times of the CO3O4 specific capacitance by NH4HCO3 for the precipitation agent.It is indicated that the CO3O4 were prepared by C6H12N4 as precipitating agent has good electrochemical capacitance performance.