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http://dx.doi.org/10.7464/ksct.2015.21.1.062

Graphene/Multi-Walled Carbon Nanotubes Hybrid Materials for Supercapacitors  

Lee, Bo-Reum (Department of Chemical Systematic Engineering, Catholic University of Daegu)
Chang, Dong Wook (Department of Industrial Chemistry, Pukyong National University)
Publication Information
Clean Technology / v.21, no.1, 2015 , pp. 62-67 More about this Journal
Abstract
We have developed a versatile method for the preparation of chemically linked graphene/multi-walled carbon nanotubes (MWNTs) hybrid materials via simple acid-catalyzed dehydration reaction between graphene oxide (GO) and amine-functionalized MWNTs (af-MWNTs). In this condition, ketone (-C=O) groups in GO and primary amine (-NH2) moieties in af-MWNTs readily react to form imine (-C=N-) linkage. The chemical structures of graphene/MWNTs hybrid materials have been investigated using various microscopic and spectroscopic measurements. As a result of the synergetic effects of hybrid materials such as improved surface area and the superior structural restoration of graphitic networks, the hybrid materials demonstrate improved capacitance with excellent long-term stability. Furthermore, controlled experiments were conducted to optimize the weight ratio of graphene/MWNTs in hybrid materials. The highest capacitance of 132.4 F/g was obtained from the GM7.5 material, in which the weight ratio between graphene and MWNTs was adjusted to 7.5/1, in 1M KOH electrolyte at a scan rate of 100 mV/s.
Keywords
Graphene; Multi-walled carbon nanotubes; Hybrid materials; Supercapacitors; Capacitance;
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