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Elektrochemische Untersuchungen des Systems Ozon/Sauerstoff an verschiedenen Elektrodensubstraten

The electrochemical behaviour of the system O3/O2 at various electrode substrates

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Abstract

The cathodic reduction of O3 and O2 in O3/O2 gas mixtures was studied at Pt−Pt/Au-alloy-, Au−Ir and Rh-electrodes in 1N-H2SO4.

The steady state polarization curves exhibitTafel-regions withb-values from 110–160 mV (260–280 mV at Rh). A single electron transfer reaction is found to be the rate determining step. In a region of high cathodic polarization limiting currents are observed which are controlled by diffusion. Platinum is the only electrode material at the O3-electrode which is stable against corrosion.

In the presence of O3 a decrease of the cathodic polarization of +300 to +400 mV for the O2 reduction is observed on Pt.

This activation of the O2-electrode is only quasi-stationary because the reduction of the Pt−O layer, which is electrocatalytically effective, proceeds at a low rate for the potentials concerned.

The triangular voltage sweep curves show that formation and reduction of oxygen layers and the electrochemical reactions of O3 and O2 respectively occur independently of each other.

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Correspondence to Dr. Christoph Fabjan.

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Fabjan, C. Elektrochemische Untersuchungen des Systems Ozon/Sauerstoff an verschiedenen Elektrodensubstraten. Monatshefte für Chemie 107, 1065–1076 (1976). https://doi.org/10.1007/BF00903792

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