Enzymatic synthesis of polyaniline/multi-walled carbon nanotube composite with core shell structure and its electrochemical characterization for supercapacitor application

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Enzymatic synthesis of polyaniline/multi-walled carbon nanotube composite with core shell structure and its electrochemical characterization for supercapacitor application

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Publication Article, peer reviewed scientific
Title Enzymatic synthesis of polyaniline/multi-walled carbon nanotube composite with core shell structure and its electrochemical characterization for supercapacitor application
Author Otrokhov, Grigory ; Pankratov, Dmitry ; Shumakovich, Galina ; Khlupova, Maria ; Zeifman, Yulia ; Vasil'eva, Irina ; Morozova, Olga ; Yaropolov, Alexander
Date 2014
English abstract
A new method involving laccase-mediator system has been developed for environmentally friendly synthesis of polyaniline/multi-walled carbon nanotubes (PANI/MWCNT) composite. Fungal laccase, potassium octocyanomolibdate (4+) and atmospheric oxygen served as catalyst, redox-mediator and terminal oxidant, respectively. The structure, morphology and electrical conductivity of composites with different PANI content were investigated. The energy storage of enzymatically obtained composite consists of an electrical double layer capacitance as well as pseudocapacitance of conducting polymer. The obtained PANI/MWCNT composite with PANI content ca. 49 wt.% had high specific capacitance and cycle stability during doping/dedoping. The specific capacitance of this composite measured by cyclic voltammetry technique with potential scan rate of 5 mV/s was ca. 440 F/g. The specific capacitance of the composite decreased by less than 7% of its maximum value after 1000 scan cycles between -0.1 and 0.7 V. Supercapacitor (SC) shell was made from flexible adhesive tape (regular Scotch tape) and current collector was formed after its separation from the surface of graphite foil. The ethanol dispersion of PANI/MWCNT composite was deposited on the current collector surface. The gel polymer electrolyte (polyvinyl alcohol in 1 M phosphoric acid) was employed as both electrolyte medium and separator. The energy and power densities under an operating window of 0.7 V were ca. 7.03 Wh/kg and 5.2 kW/kg, respectively. Crown Copyright (C) 2013 Published by Elsevier Ltd. All rights reserved.
DOI https://doi.org/10.1016/j.electacta.2013.12.089 (link to publisher's fulltext.)
Publisher Elsevier
Host/Issue Electrochimica acta;
Volume 123
ISSN 0013-4686
Pages 7
Page 151-157
Language eng (iso)
Subject Carbon nanotubes
Laccase-mediator system
Aniline polymerization
Polyaniline composite
Electrochemical properties
Supercapacitor
Technology
Research Subject Categories::TECHNOLOGY
Handle http://hdl.handle.net/2043/27416 Permalink to this page
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