Abstract
In situ electrochemical polymerization of an aniline solution containing multi-walled carbon nanotube (MWCNT) of 0.8 wt.% was used to prepare (MWCNT)/polyaniline(PANI) composite films. The electrochemical capacitance performances of these films were investigated with cyclic voltammetry (CV) and ac impedance spectroscopy in 1 M H2SO4 with a three-electrode system. It was found that the MWCNT/PANI films show much higher specific capacitance (SC), better cyclic stability and more promising for applications in supercapacitors than a pure PANI film electrode. The highest specific capacitance value of 500 F g−1 was obtained for the MWCNT/PANI composite film.
Highlights
Supercapacitors store electrical energy through double layer charging, faradaic processes, or a combination of both
multi-walled carbon nanotube (MWCNT)/PANI composite films were deposited on stainless-steel sheet (SS, 0.5mm thick) by in-situ electrochemical polymerization
The electro polymerization of aniline dissolved MWCNT can be observed by the color change on the surface of the working electrode
Summary
Supercapacitors store electrical energy through double layer charging, faradaic processes, or a combination of both. There is no need for added oxidants and electrodeposited conducting polymers are naturally integrated as a continuous uniform film on the electrode, saving the use of a binder.[24] We fabricated the MWCNT/PANI composite films for supercapacitor electrode by an in-situ electrochemical polymerization.
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