Abstract
The cathodic reduction of ozone according to the overall reaction O3+H2O+2e→O2+2OH− was studied on bright platinum electrodes in KOH electrolytes. The rest potentials deviate from the theoretical values by −300 to −350 mV. They are determined by a mixed potential mechanism involving anodic evolution of O2 and cathodic reduction of O3 as half reactions. Steady-state polarization measurements were carried out. Extrapolation of Tafel-lines to zero over-voltage and the determination of the charge transfer resistance give current densities at the rest potential, which are analogous to exchange current densities. A single electron transfer reaction is found to be the rate controlling step, which is occurring twice for the reduction of one molecule of ozone. A cathodic reaction order of approximately zero is evaluated with respect to OH−-ion concentration. The reaction mechanism is proposed according to
which is consistent with experimental data.
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Herrn Prof. Dr.Richard Kieffer zu seinem 70. Geburstag in Verehrung gewidmet.
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Fabjan, C. Die kathodische Reduktion von Ozon in alkalischen Elektrolyten. Monatshefte für Chemie 106, 513–528 (1975). https://doi.org/10.1007/BF01150533
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DOI: https://doi.org/10.1007/BF01150533