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Asymmetric supercapacitor containing poly(3-methyl thiophene)-multiwalled carbon nanotubes nanocomposites and activated carbon

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Title Asymmetric supercapacitor containing poly(3-methyl thiophene)-multiwalled carbon nanotubes nanocomposites and activated carbon
 
Creator SIVARAMAN, P
BHATTACHARRYA, AR
MISHRA, SP
THAKUR, AP
SHASHIDHARA, K
SAMUI, AB
 
Subject Poly(3-methyl thiophene)
Multiwalled carbon nanotubes
Nanocomposites
Supercapacitor
Specific capacitance
ELECTROCHEMICAL CAPACITORS
CONDUCTING-POLYMER
HYBRID SUPERCAPACITOR
ENERGY-STORAGE
IONIC LIQUID
PERFORMANCE
COMPOSITES
ELECTRODES
POLYTHIOPHENE
DENSITY
 
Description Poly(3-methyl thiophene) (PMT) and multiwalled carbon nanotubes (MWCNT) based nanocomposites have been prepared chemically at various wt. ratios. Nanocomposites are characterized by TEM, TGA, XRD and Raman spectroscopy. The morphology of nanocomposites shows fine wrapping of PMT over MWCNT. Electrodes containing PMT nanocomposites have been prepared and p-doping of nanocomposites studied in electrolyte containing 1 M tetraethylene ammonium tetra fluroborate in propylene carbonate. Specific capacitance of the nanocomposites increases with increase in PMT loading and a maximum specific capacitance of 296 F g(-1) has been obtained for the nanocomposite with PMT/MWCNT wt. ratio of 87.5/12.5. Non aqueous based asymmetric supercapacitors containing PMT nanocomposites as the positive electrode and activated carbon (AC) as the negative electrode have been fabricated. Supercapacitor unit cells have been constructed at the optimized mass ratio of the electrodes so as to obtain maximum total specific capacitance and specific energy. Highest specific capacitance obtained for PMT nanocomposite-AC system is 38.5 F g(-1) of the total active material in the supercapacitor. The complex capacitance of the supercapacitors derived from electrochemical impedance spectroscopy reveals that supercapacitor containing nanocomposites with higher concentration of MWCNT has shorter relaxation time constant (to) leading to higher rate capability. Continuous charge-discharge cycling studies indicate that PMT nanocomposite-AC supercapacitor have better stability than bulk PMT-AC supercapacitor. (C) 2013 Elsevier Ltd. All rights reserved.
 
Publisher PERGAMON-ELSEVIER SCIENCE LTD
 
Date 2014-10-14T17:43:39Z
2014-10-14T17:43:39Z
2013
 
Type Article
 
Identifier ELECTROCHIMICA ACTA, 94182-191
http://dx.doi.org/10.1016/j.electacta.2013.01.123
http://dspace.library.iitb.ac.in/jspui/handle/100/14598
 
Language en