Abstract
The mechanism of oxygen reduction on steel was determined as a function of the state of the surface. The steel/alkaline electrolyte interface was found to provide a particularly well defined electrochemical system for rotating ring/disc electrode (RRDE) studies which enabled the quantitative kinetic evaluation of separate reaction steps. Some relevant concepts and equations used in the interpretation of RRDE data were re-examined and/or derived. Measurements of the collection efficiency using the oxygen/peroxyl ion system have shown that the platinum ring commonly used in mechanistic studies of oxygen reduction catalyzes the chemical decomposition of peroxyl ions, thus leading to erroneous mechanistic determinations.
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