Shi, C. and Zhitomirsky, I. (2010) Electrodeposition and Capacitive Behavior of Films for Electrodes of Electrochemical Supercapacitors. NANOSCALE RESEARCH LETTERS, 5 (3). pp. 518-523. ISSN 1931-7573 (Print) 1556-276X (Online)
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Polypyrrole films were deposited by anodic electropolymerization on stainless steel substrates from aqueous pyrrole solutions containing sodium salicylate and tiron additives. The deposition yield was studied under galvanostatic conditions. The amount of the deposited material was varied by the variation of deposition time at a constant current density. SEM studies showed the formation of porous films with thicknesses in the range of 0â3Â Î¼m. Cyclic voltammetry data for the films tested in 0.5Â M Na2SO4 solutions showed capacitive behavior and high specific capacitance (SC) in a voltage window of 0.9Â V. The films prepared from pyrrole solutions containing tiron showed better capacitive behavior compared to the films prepared from the solutions containing sodium salicylate. A highest SC of 254Â FÂ gâ1 was observed for the sample with a specific mass of 89Â Î¼gÂ cmâ2 at a scan rate of 2Â mVÂ sâ1. The SC decreased with an increasing film thickness and scan rate. The results indicated that the polypyrrole films deposited on the stainless steel substrates by anodic electropolymerization can be used as electrodes for electrochemical supercapacitors (ES).
|Subjects:||Material Science > Functional and hybrid materials|
Technology > Nanotechnology and energy applications
|Deposited By:||M T V|
|Deposited On:||21 Apr 2010 14:57|
|Last Modified:||21 Apr 2010 14:57|
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