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Title: Preparation and characterization of an all solid supercapacitor based on polyaniline-Al₂O₃ layer on aluminium alloy-Al-2024
Authors: Kumar, M Selva
Bhat, D Krishna
Keywords: Supercapacitors
Electrochemical deposition
Aluminium Alloy Al-2024
Solid electrolyte
Issue Date: Nov-2007
Publisher: CSIR
IPC CodeH01G9/025
Abstract: The characteristics of an all solid state supercapacitor based on polyaniline (Pani)-Al₂O₃ coating on aluminium alloy 2024 (Al-2024) surface prepared by the constant current method have been investigated. Three stages are observed in the potential- electrolysis time relation for the simultaneous preparation of the dielectric layer and the conducting polymer on the aluminium foil. The deposition of polyaniline film has been confirmed by cyclic voltammetry. The solid state capacitor has been studied by AC impedance spectroscopy and the capacitive behaviour of the cell is discussed in terms of Nyquist plots, complex capacitance and complex power. The study revealed that the capacitor has comparatively good capacitance, ranging from 450 to 600nF/cm², a low time constant and also very low resistance. The normalized reactive power, |Q|/|S| and active power |P|/|S| versus frequency plot for the solid state capacitor allow an overview of the whole frequency behaviour of the supercapcitors, ranging from a pure resistance at high frequency to a pure capacitance at low frequency. When a capacitor is used as a source stiffening capacitor and is buffering the supply by delivering initial current, a lower RC time constant allows delivering significantly more current. So this type of solid-state capacitor can be used for the DC-DC converter modules.
Page(s): 572-575
ISSN: 0971–457X
Source:IJCT Vol.14(6) [November 2007]

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