High-performance energy storage of poly (o-methoxyaniline) film using an ionic liquid as electrolyte

Different materials have been proposed as active electrode in electrochemical capacitors, including conducting polymers. Among them, several papers describe the use of polyaniline and its derivatives for such purpose. However, the use of poly(o-methoxyaniline), a polyaniline derivative, in ionic liq...

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Bibliographic Details
Published in:Energy (Oxford) 2017-12, Vol.141, p.1829-1835
Main Authors: Christinelli, W.A., da Trindade, L.G., Trench, A.B., Quintans, C.S., Paranhos, C.M., Pereira, E.C.
Format: Article
Language:English
Subjects:
Capacitance
Conducting polymers
Electrochemical analysis
Electrochemistry
Electrodes
Energy storage
Ionic liquid
Ionic liquids
Poly (o-methoxyaniline)
Polyanilines
Polyethylene glycol
Polymers
Stability
Supercapacitors
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Summary:Different materials have been proposed as active electrode in electrochemical capacitors, including conducting polymers. Among them, several papers describe the use of polyaniline and its derivatives for such purpose. However, the use of poly(o-methoxyaniline), a polyaniline derivative, in ionic liquid electrolytes as pseudocapacitors has never been proposed in the literature. Therefore, the objective of this work is to investigate the electrochemical properties and stability of POMA casting film in ionic liquid electrolyte as electrode for supercapacitors. Cyclic voltammetry and galvanostatic charge/discharge experiments have been used to analyze the behavior of the films. The results show that POMA films have high specific capacitance and good electrochemical stability during 3000 cycles. Its initial value is 260 F g−1 in a mixture of ionic liquid and polyethylene glycol (80:20 v/v). The specific energy shows 70% retention from the initial value after 3000 cycles. Furthermore, the specific power remains remarkably stable during 3000 cycles, as well as the coulombic efficiency, which is about 99%. For these reasons this work opens up the possibilities of using conducting polymers in ionic liquids and illustrates its good behavior and stability for supercapacitor application. •Poly(o-methoxy aniline) in ionic liquid is used as electrode, and electrolyte.•The obtained system has been tested as active material for supercapacitors.•The material shows 260 F g-11 and retains 70% of the initial values after 3000 cycles.
ISSN:0360-5442
1873-6785
DOI:10.1016/j.energy.2017.11.026