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

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Summary

Introduction

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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