Electrochemical performance of asymmetric supercapacitor based on Co₃O₄/AC materials

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• 作者：Changming Zhang ; Lijing Xie ; Wen Song ; Jianlong Wang ; Guohua Sun ; Kaixi Li
• 关键词：Asymmetric supercapacitor ; Nano-wired Co3O4 ; Activated carbon ; Energy density
• 刊名：Journal of Electroanalytical Chemistry
• 出版年：1 October, 2013
• 年：2013
• 卷：706
• 期：Complete
• 页码：1-6
• 全文大小：1726 K

文摘

A nano-wired Co₃O₄ was successfully synthesized by a hydrothermal method in combination with subsequent calcination process. An asymmetric supercapacitor based on the Co₃O₄ as the positive electrode and the activated carbon (AC) as the negative electrode with a 6 M KOH solution as electrolyte was assembled. The electrochemical performance of the asymmetric supercapacitor was investigated by means of cyclic voltammetry and galvanostatic charge-discharge tests. A specific capacitance of 81 F g^鈭? as well as specific energy density of 24.9 W h kg^鈭? was obtained for the asymmetric supercapacitor within the voltage range of 0-1.5 V. The supercapacitor also exhibited a good cycling performance and kept 90% of initial capacity after 5000 cycles.