Abstract
In this study, poly(3,4-ethylenedioxythiophene)/thiophene-grafted graphene oxide (PEDOT/Th-GO) composites from covalently linking of Th-GO with PEDOT chains were prepared via in situ chemical polymerization with different weight percentage of Th-GO ranging between 40 and 70 % in reaction medium. The resulting composite materials were characterized using a various analytical techniques. The structural analysis showed that the composites displayed a higher degree of conjugation and thermal stability than pure PEDOT, and the weight percentage of Th-GO could affect the doping level, amount of undesired conjugated segments, and porous structure of composites. Electrochemical analysis suggested that the highest specific capacitance of 320 F g−1 at a current density of 1 A g−1 with good cycling stability (capacitance retention of 80 % at 1 A g−1 after 1000 cycles) was achieved for the composite prepared from 50 wt% Th-GO content in reaction medium.
Highlights
Supercapacitors, aimed at narrowing the gap between batteries and capacitors to form fast charging energy storage devices of intermediate specific energy, have attracted growing attention because of its high power density, fast charging-discharging processes and long cycle life [1, 2]
In summary, the PEDOT/Th-Graphene oxide (GO) composites from covalently linking of thiophene-grafted GO (Th-GO) with PEDOT chains were prepared via in situ polymerization
The systematic structural analysis revealed that the thiophene-grafted GO (Th-GO) highly dispersible in CHCl3 to form stable colloidal suspension, and the thiophene unit on GO promotes the covalently linking of Th-GO with PEDOT by avoiding undesirable coupling
Summary
Supercapacitors, aimed at narrowing the gap between batteries and capacitors to form fast charging energy storage devices of intermediate specific energy, have attracted growing attention because of its high power density, fast charging-discharging processes and long cycle life [1, 2]. The main materials used for supercapacitor electrode preparation include carbon materials, transition metal oxides, and conducting polymer [3]. Graphene, a two-dimensional carbon material, has been widely applied in supercapacitors due to its very large surface area, excellent electrical conductivity, and strong mechanical strength [4, 5]. Graphene oxide (GO), the oxidation form of graphene [6], contains oxygen functional groups such as epoxide and hydroxyl on the basal planes and carboxylic acid and other carbonyl group on the edges of the graphene nanosheets [7]. The carbon atoms located on the edges of the GO nanosheets are. Wang et al Nanoscale Research Letters (2015) 10:370 conducting polymer is the current interest. It was found that covalent functionalization of GO is a promising method for grafting polymer chain onto GO as well as improving the dispersibility and interfacial interaction between polymer matrix and GO [16]
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