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Title A Potentiodynamic Electrodeposition Kinetic Study of Anilinium hydrochloride on Indium Tin Oxide
Posted by Bryan Montalban
Authors Bryan M. Montalban, Mylene M. Uy, and Reynaldo M. Vequizo
Publication date 2018
Conference 2018 International Conference in Advanced Functional Materials and Nanotechnology (ICAFMN 2018)
Abstract To understand the electropolymerization growth kinetics of polyaniline (PANI) on a semiconducting substrate, the electrodeposition of anilinium hydrochloride (AnH+) on indium tin oxide (ITO) was investigated. Electropolymerization and deposition of a pseudocapacitive PANI thin film on ITO was achieved via a facile potentiodynamic technique in a three-electrode electrochemical cell using different AnH+ and phosphoric acid (PA) electrolyte concentrations, scanned from 0.2 V to 0.9 V (vs. Ag/AgCl). At the early stage of AnH+ polymerization, the observed induction period was independent on the electrolyte concentration but it varied with the monomer concentration. It was also evident that after the electrooxidation of the monomers, the first chemical species to electrodeposit on the surface of ITO was the dimerization product, 4-aminodiphenylamine. Furthermore, the reaction order with respect to the monomer and the PA electrolyte concentration was found to be a first and second order, respectively. The calculated apparent rate constant (kobs) varies with the PA electrolyte concentration. This suggests that the electrolyte acts as a catalyst during the electropolymerization process. Electropolymerization kinetics of PANI using phosphoric acid as electrolyte was first reported in this study.
Index terms / Keywords Electrodeposition, electropolymerization, potentiodynamic, reaction order, apparent rate constant.