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Fabrication of Graphene/Poly(styrenesulfonic acid-g-aniline) Composites for High Performance Supercapacitor Electrodes

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Authors
Lee, Jin Woo; Jo, Jae Woong; Kim, Kyung Tae; Jo, Won Ho
Issue Date
2015-12
Citation
2015 International Chemical Congress of Pacific Basin Societies, December 15-20, 2015, Honolulu, Hawaii
Abstract
Polyaniline (PANI) as a potential candidate for supercapacitor electrode has high theoretical
specific capacitance of about 2000 F/g. However, PANI itself suffers from poor solubility in
common solvents, which restricts fabrication of supercapacitor electrodes directly from PANI.
In our previous report, we synthesized a water-soluble and self-doped conducting polymer,
poly(styrenesulfonic acid)-graft-polyaniline (PSSA-g-PANI), to overcome the solubility
problem of PANI. When PSSA-g-PANI is added into graphite in ethanol, it is realized that
the graft copolymer exfoliates graphite into graphene layers to form in-situ composite of
graphene/PSSA-g-PANI, because PANI in PSSA-g-PANI is strongly physisorbed onto
graphene surface via strong  interaction while PSSA in PSSA-g-PANI enhances the
solubility in ethanol. To the best of our knowledge, this is the only PANI/graphene composite
fabricated by direct exfoliation method. Compared to other fabrication methods for
PANI/graphene composites such as in-situ polymerization and electrodeposition, the direct
exfoliation method provides high quality of graphene layers without degrading the sp2
structure because graphite is directly used as a precursor without chemical treatment, and also
minimizes the fabrication step by simply mixing graphite and the polymer. As a consequence,
PSSA-g-PANI/graphene composite is easily fabricated by a solution process and used
directly for supercapacitor electrodes.When the capacitance of the composite was measured
by the Galvanostatic method, the composite exhibits high specific capacitance of 767 F/g at
0.5 A/g, which is among the highest value of supercapacitor electrodes based on
PANI/graphene composites. This high value is attributed to high specific area of graphene
and high pseudo-capacitance of PANI. Furthermore, PSSA-g-PANI/graphene composite
retains 82% of its initial capacitance after 1000 cycles, indicating that the composite has high
electrochemical stability.
Language
English
URI
https://hdl.handle.net/10371/95647
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College of Engineering/Engineering Practice School (공과대학/대학원)Dept. of Material Science and Engineering (재료공학부) Others_재료공학부
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