期刊
CURRENT APPLIED PHYSICS
卷 13, 期 1, 页码 196-204出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.cap.2012.07.009
关键词
Electrochemical capacitor; Cobalt oxide; Multiwalled carbon nanotubes; Graphene nanosheets; Electrochemical impedance spectroscopy
资金
- Fundamental R&D Program for Core Technology of Materials [M2009010025]
- Ministry of Knowledge Economy (MKE), Republic of Korea
- Ministry of Education, Science Technology (MEST)
- Korea Industrial Technology Foundation (KOTEF) through the Human Resource Training Project for Regional Innovation
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 doublelayer capacitive behavior due to the different nanostructures of the composites. (C) 2012 Elsevier B.V. All rights reserved.
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