Addition of multiwalled carbon nanotube and graphene nanosheet in cobalt oxide film for enhancement of capacitance in electrochemical capacitors

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• 作者：T. Battumur ; Swapnil B. Ambade ; Rohan B. Ambade ; Pashupati Pokharel ; Dai Soo Lee ; Sung-Hwan Han ; Wonjoo Lee ; Soo-Hyoung Lee
• 关键词：Electrochemical capacitor ; Cobalt oxide ; Multiwalled carbon nanotubes ; Graphene nanosheets ; Electrochemical impedance spectroscopy
• 刊名：Current Applied Physics
• 出版年：2013
• 出版时间：January, 2013
• 年：2013
• 卷：13
• 期：1
• 页码：196-204
• 全文大小：1412 K

文摘

In order to enhance the capacitance of electrochemical capacitors, multiwalled carbon nanotubes (MWCNTs) and graphene nanosheets (GNS) were added to cobalt oxide (Co₃O₄) paste. The composite film based on Co₃O₄/MWCNT/GNS (95:4:1?wt % ) exhibited a capacitance of 294?F/g while the capacitance of Co₃O₄/MWCNT (95:5?wt % ) and pure Co₃O₄ film is 205 and 163?F/g, respectively. The enhanced capacitance of Co₃O₄/MWCNT/GNS composite film was attributed to the electrochemical contributions of the Co₃O₄ nanoparticle attached to the GNS as well as their significantly increased specific surface areas by MWCNTs. Furthermore, the composite films showed faradaic redox capacitive behavior to double-layer capacitive behavior due to the different nanostructures of the composites.