Addition of multiwalled carbon nanotube and graphene nanosheet in cobalt oxide film for enhancement of capacitance in electrochemical capacitors |
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| Authors: | T. Battumur Swapnil B. Ambade Rohan B. Ambade Pashupati Pokharel Dai Soo Lee Sung-Hwan Han Wonjoo Lee Soo-Hyoung Lee |
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| Affiliation: | 1. School of Semiconductor and Chemical Engineering, Chonbuk National University, Jeonju, Jeonbuk 561-756, Republic of Korea;2. Department of Chemistry, Hanyang University, Seoul 133-791, Republic of Korea;3. Advanced Materials Research Center, Samsung Advanced Institute of Technology, Samsung Electronics, Yongin, Gyeonggi 449-712, Republic of Korea |
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| Abstract: | 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. |
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