Journal of Power Sources, Vol.216, 502-507, 2012
Electrocatalysis of oxygen reduction at poly (4-amino-3-hydroxynaphthalene sulfonic acid) and platinum loaded polymer modified glassy carbon electrodes
The electrochemical polymerization of p-(4-amino-3-hydroxynaphtalene sulfonic acid) is investigated by using cyclic voltammetry. Low amount of platinum is loaded (17-303 mu g) on the polymer modified glassy carbon electrode. The electrocatalytic activity of the modified electrodes towards oxygen reduction reaction is investigated. The polymer modified glassy carbon electrode shows a two electron reduction of oxygen to hydrogen peroxide and the platinum loaded polymer modified glassy carbon electrode shows a direct four electron reduction of oxygen to water. The chronocoulometric study of the oxygen reduction reaction shows similar results to those obtained with other techniques. Koutecky-Levich plot analysis is used to predict the mechanism and evaluate the kinetic parameters. Temkin adsorption isotherm is observed for lower platinum loading and Langmuirian for high platinum loading. (C) 2012 Elsevier B.V. All rights reserved.
Keywords:4-Amino-3-hydroxynaphtalene sulfonic acid;Platinum;Oxygen reduction reaction;Glassy carbon electrode