Open Access Nano Express

Asymmetric Flexible Supercapacitor Stack

A Leela Mohana Reddy, F Estaline Amitha, Imran Jafri and S Ramaprabhu*

Author Affiliations

Alternative Energy Technology Laboratory, Department of Physics, Indian Institute of Technology Madras, Chennai, 600 036, India

For all author emails, please log on.

Nanoscale Research Letters 2008, 3:145-151  doi:10.1007/s11671-008-9127-3

Published: 9 April 2008

Abstract

Electrical double layer supercapacitor is very significant in the field of electrical energy storage which can be the solution for the current revolution in the electronic devices like mobile phones, camera flashes which needs flexible and miniaturized energy storage device with all non-aqueous components. The multiwalled carbon nanotubes (MWNTs) have been synthesized by catalytic chemical vapor deposition technique over hydrogen decrepitated Mischmetal (Mm) based AB3alloy hydride. The polymer dispersed MWNTs have been obtained by insitu polymerization and the metal oxide/MWNTs were synthesized by sol-gel method. Morphological characterizations of polymer dispersed MWNTs have been carried out using scanning electron microscopy (SEM), transmission electron microscopy (TEM and HRTEM). An assymetric double supercapacitor stack has been fabricated using polymer/MWNTs and metal oxide/MWNTs coated over flexible carbon fabric as electrodes and nafion®membrane as a solid electrolyte. Electrochemical performance of the supercapacitor stack has been investigated using cyclic voltammetry, galvanostatic charge-discharge, and electrochemical impedance spectroscopy.

Keywords:
Multiwalled carbon nanotubes; Polymers; Metal oxide; Supercapacitor stack; Asymmetry; Solid electrolyte