Journal
JOURNAL OF POWER SOURCES
Volume 260, Issue -, Pages 34-42Publisher
ELSEVIER
DOI: 10.1016/j.jpowsour.2014.02.070
Keywords
Flexible supercapacitor; Pseudo-capacitor; Carbon nanotubes; Polyaniline; Liquid-liquid interfaces; Nanocomposites
Funding
- CNPq
- CAPES
- NENNAM (Pronex, Fundacao Araucaria/cnpq)
- National Institute of Science and Technology of Carbon Nanomaterials
- CME-UFPR
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The present work describes for the first time the synthesis and characterization of single wall carbon nanotubes/polyaniline (SWNTs/PAni) nanocomposite thin films in a liquid-liquid interface, as well as the subsequent construction of a flexible all-solid supercapacitor. Different SWNTs/PAni nanocomposites were prepared by varying the ratio of SWNT to aniline, and the samples were characterized by scanning and transmission electron microscopy, Raman and UV-Vis spectroscopy, cyclic voltammetry and electrochemical impedance spectroscopy. The pseudo-capacitive behavior of the nanocomposites was evaluated by charge/discharge galvanostatic measurements. The presence of the SWNTs affected the electronic and vibrational properties of the polyaniline and also improved the pseudo-capacitive behavior of the conducting polymer. A very thin and flexible all-solid device was manufactured using two electrodes (polyethylene terephthalate-PET covered with the SWNT/PAni nanocomposite separated by a H2SO4-PVA gel electrolyte). The pseudo-capacitive behavior was characterized by a volumetric specific capacitance of approximately 76.7 F cm(-3), even under mechanical deformation, indicating that this nanocomposite has considerable potential for application in new-generation energy storage devices. (C) 2014 Elsevier B.V. All rights reserved.
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