Abstract
Nanostructured multilayer manganese dioxide/nickel/copper sulfite (MnO2/Ni/CuS) composite films were successfully deposited on supporting polyethylene terephathalate (PET) substrate through the sequential deposition of CuS, Ni and MnO2 thin films by chemical bath deposition, electrodeposition, and horizontal submersion deposition techniques, respectively. Deposition of each thin-film layer was optimized through varying deposition parameters and conditions associated with specific deposition technique. Both CuS and Ni thin films were optimized for their electrical conductivity whereas MnO2 thin film was optimized for its microstructure and charge capacity. The electrochemical properties of nanostructured multilayer MnO2/Ni/CuS composite films were evaluated by cyclic voltammetry as electrode materials of electrochemical capacitor prototype in a dual planar device configuration. Cyclic voltammograms in mild Na2SO4 aqueous electrolyte exhibited a featureless and almost rectangular shape which was indicative of ideal capacitive behavior and high cycling reversibility for prolonged cycling up to 1,500 cycles. Nanostructured multilayer MnO2/Ni/CuS composite films on supporting polyethylene terephathalate (PET) substrate could potentially be utilized as electrode materials for the fabrication of high performance electrochemical capacitors.
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