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Kim, Byeong-Su
Soft and Hybrid Nanomaterials Lab
Research Interests
  • Carbon materials, polymer, Layer-by-Layer (LbL) assembly, hyperbranched polymer, polyglycerol (PG), bio-applications

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Ultrathin Supercapacitor Electrode Based on Reduced Graphene Oxide Nanosheets Assembled with Photo-Cross-Linkable Polymer: Conversion of Electrochemical Kinetics in Ultrathin Films

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Title
Ultrathin Supercapacitor Electrode Based on Reduced Graphene Oxide Nanosheets Assembled with Photo-Cross-Linkable Polymer: Conversion of Electrochemical Kinetics in Ultrathin Films
Author
Jo, KiyoungGu, MinsuKim, Byeong-Su
Issue Date
2015-11
Publisher
AMER CHEMICAL SOC
Citation
CHEMISTRY OF MATERIALS, v.27, no.23, pp.7982 - 7989
Abstract
An ultrathin supercapacitor electrode based on reduced graphene oxide (rGO) nanosheets is prepared using Layer-by-Layer (LbL) assembly. The rGO nanosheets functionalized with a conducting polymer, poly(3,4-ethylene dioxythiophene):poly(styrenesulfonate) (PEDOT:PSS), were assembled using a photo-cross-linkable diazoresin (DR). The unique photo-cross-linking property of the DR polymer enabled the conversion of the ionic bonds in the LbL-assembled film to covalent bonds upon UV irradiation, significantly enhancing the overall electrochemical activity of the resulting ultrathin supercapacitor electrode. By UV/vis and Fourier transform infrared (FT-IR) spectroscopy measurements, we proved that decomposition of the diazonium group from DR, followed by covalent bond formation, contributed to the enhanced integrity of the adjacent interfaces within the multilayers. In particular, electrochemical measurements suggested that a charge transfer process is facilitated after cross-linking, which resulted in a considerable increase in the volumetric capacitance. The hybrid thin film of the rGO supercapacitor exhibited a capacitance of 354 F/cm3 at a scan rate of 20 mV/s and maintained a capacitance of 300 F/cm3 even at a high scan rate of 200 mV/s, thus outperforming many other thin film supercapacitors.
URI
https://scholarworks.unist.ac.kr/handle/201301/18002
URL
http://pubs.acs.org/doi/10.1021/acs.chemmater.5b03296
DOI
10.1021/acs.chemmater.5b03296
ISSN
0897-4756
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PHY_Journal Papers
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