THE CATHODIC REDUCTION OF OXYGEN AT PLATINUM ELECTRODE IN NEUTRAL SOLUTIONS IN THE REGION OF LIMITING CURRENT. EFFECT OF THE STATE OF ELECTRODE SURFACE
DOI:
https://doi.org/10.17072/2223-1838-2019-4-380-390Keywords:
oxygen electroreduction, limiting current, platinum electrode, neutral solution, impedance, NDRAbstract
The influence of Pt electrode surface pretreatment and chloride ion concentration on the polarization curves and impedance spectra for the oxygen reduction reaction in neutral solutions at and near the limiting current has been studied with special emphasis on the conditions for negative values of the real part of impedance, Z', at low frequencies. It was shown that the negative Z' values in KCl solu- tions are not typical for the anodic-cathodic pretreatment of platinum (in acidic or alkaline solution). Necessary conditions for Z' < 0 to appear are the presence of chloride ions in solution and oxidized (chemically or electrochemically) platinum surface.References
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