(1) National Taiwan University of Science and Technology - Taipei - Taiwan, (2) National Taiwan University of Science and Technology - Taipei - Taiwan
A flexible asymmetric Supercapacitor (ASC) based on NiCo2O4 nanoneedle
arrays has been synthesized on carbon cloth by a facile hydrothermal method and subsequently
TiO2/Carbon nanorods were grown on carbon cloth by two step hydrothermal process with post
annealing treatment. An asymmetric Supercapacitor consisting of positive electrode based on
pure pseudocapacative and negative electrode based on electric double layer capacitive
behaviour, with wide operational potential window leading to enhancement in the energy
density comparative to symmetric double layer-supercapacitor. In such ASC design, NiCo2O4
and TiO2/Carbon acts as cathode and anode respectively, react with KOH electrolyte to store
energy. Strategy have been focussed to improve the electrical conductivity of TiO2 by coating
carbon further throughout the TiO2 layer which have boosted storage capability of TiO2 based
hybrids. The electrochemical properties of the supercapacitor electrodes was investigated by
cyclic voltammetry, galvanostatic charge-discharge and electrochemical impedance
spectroscopy via three electrode configuration and two electrode cell. All electrochemical
measurements were carried out at room temperature using electrochemical workstation.
Therefore, this novel strategy for designing new type of electrode material will offer keen
interest in the field of ASC application.