Solvothermal synthesis and electrochemical performance in super-capacitors of Co₃O₄/C flower-like nanostructures

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• 作者：Jinhui Jiang ; Weidong Shi ; Shuyan Song ; Qingli Hao ; Weiqiang Fan ; Xifeng Xia ; Xian Zhang ; Qian Wang ; Chunbo liu ; Dan Yan
• 关键词：In situ carbon coating ; Three dimensional flower-like nanostructures ; Cobalt oxide ; Supercapacitor
• 刊名：Journal of Power Sources
• 出版年：15 February, 2014
• 年：2014
• 卷：248
• 期：Complete
• 页码：1281-1289
• 全文大小：3862 K

文摘

Novel three dimensional (3D) Co₃O₄/C flower-like nanostructures are synthesized via a facile solvothermal strategy. The samples are characterized by XRD, XPS, FT-IR, Raman, TG, SEM and HRTEM. The results show that the 3D flower-like nanostructures are consisted of numerous 2D nanosheets with the thickness of about 20聽nm. The pseudocapacitive behaviors of Co₃O₄/C and bare Co₃O₄ flower-like nanostructures are investigated by cyclic voltammograms, galvanostatic charge-discharge and electrochemical impedance spectroscopy test. The results reveal that the Co₃O₄/C delivers a large specific capacitance of as high as 865聽F聽g^鈭? and 330聽F聽g^鈭? at 1聽mV聽s^鈭? and 0.5聽A聽g^鈭?, according to CV and galvanostatic test, respectively; while the bare Co₃O₄ has a poor electrochemical performance, which exhibits specific capacitance of 131.7聽F聽g^鈭? and 46.1聽F聽g^鈭? at the same condition. The excellent electrochemical performance is attributed to the carbon present on the Co₃O₄ and the morphology, which possesses large surface area, unique flower-like nanostructures and low equivalent series resistance.