溶剂热法制备多层结构Co_3O_4及其超电容特性

Co_3O_4 prepared by solvothermal and its super-capacitance performance

以硝酸钴为原料,溴化十六烷基三甲胺(CTAB)为分散剂,尿素为沉淀剂,采用混合溶剂热法制备了Co_3O_4。研究了水-正丁醇、水-正戊醇-正己烷、水-正丁醇-正己烷三种不同溶剂体系下对Co_3O_4超电容性的影响。通过交流阻抗、循环伏安、恒流充放电对Co_3O_4电极材料的电化学性能进行表征,结果表明,不同溶剂对其电化学性能有显著影响,在水-正丁醇-正己烷的溶剂体系中,反应温度为100℃时得到的Co_3O_4电极材料具有较好的电化学性能,在6 mol/L KOH溶液中,电流密度为5 mA/cm^2时,其单电极放电比电容达667.7 F/g。

Co3O4with cobalt nitrate and cetyl trimethylamine bromide(CTAB)as dispersing agent and urea as precipitating agent in different solvent systems under different temperatures were synthesized by solvothermal method.By cyclic voltammetry,galvanostatic charge-discharge and AC impedance,the electrochemical performance of electrode material Co3O4were characterized.The results show that the effects of different solvents on the electrochemical properties are significant;in6mol/L KOH solution,in the water-hexane-butanol systemat reaction temperature of100℃,the obtained Co3O4electrode material has better electrochemical performance;at a current density of5mA/cm2,the single-electrode discharge specific capacity is667.7F/g.