Abstract
A detailed study of the effects of different electropolymerization methods on the supercapacitive properties of polypyrrole (PPy) thin films deposited on carbon cloth is reported. Deposition mechanisms of PPy thin films through cyclic voltammetry (CV), potentiostatic (PS), and galvanostatic (GS) modes have been analyzed. The resulting PPy thin films have been characterized by X-ray photoelectron spectroscopy (XPS), SEM, and TEM. The electrochemical properties of PPy thin films were investigated by cyclic voltammetry and galvanostatic charge/discharge. The results showed that the different electrodeposition modes of synthesis significantly affect the supercapacitive properties of PPy thin films. Among different modes of electrodeposition, PPy synthesized by a potentiostatic mode exhibits maximum specific capacitance of 166 F/g with specific energy of 13 Wh/kg; this is attributed to equivalent proportions of the oxidized and neutral states of PPy. Thus, these results provide a useful orientation for the use of optimized electrodeposition modes for the growth of PPy thin films to be applied as electrode material in supercapacitors.
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CAPES Foundation, Ministry of Education of Brazil: Process BEX 3196/14-3. Spanish grant MAT2012-39199-C02-01 is also acknowledged.
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Dedicated to José H. Zagal on the occasion of his 65th birthday in appreciation of his contributions to electrocatalysis and to the general development of our electrochemical science in Chile and beyond.
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Wolfart, F., Dubal, D.P., Vidotti, M. et al. Electrochemical supercapacitive properties of polypyrrole thin films: influence of the electropolymerization methods. J Solid State Electrochem 20, 901–910 (2016). https://doi.org/10.1007/s10008-015-2960-2
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DOI: https://doi.org/10.1007/s10008-015-2960-2