Abstract
Voltammograms of Pt-black electrodes were recorded in aerated 1M HClO4 solution, at T=298K, for three different upper values of the oxidation potential, Emax=1.6V, 1.44V and 1.39V. Numerical differentiation of the raw data enhanced details which hardly were visible in the original voltammograms. The derivative of the anodic current resided in well defined peaks attributed to two peaks-like electrode reactions (potential range 0.6V–1.0V) and a smooth reaction generating the anodic current plateau, at potential higher than 1V. The derivative of the cathodic peaks revealed that the cathodic current results from two reactions occurring simultaneously, but with different rates: the reduction of the adsorbed - OH* followed by that of the adsorbed–O*. The data fitting analysis was performed with the empirical kinetic equations based upon the sigmoid-like functions. The analysis confirmed the results found on the derivative voltammograms and enabled to compute the individual component of the anodic and cathodic branches. Complementary mass measurements with the electrochemical quartz crystal microbalance (EQCM) confirmed that both the oxidation and the reduction processes on the Pt-black electrodes consist of a complex succession of overlapping reactions associated with both the adsorbed - OH* and - O* species.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
