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Transients of the Open-Circuit Potential during Carbon Monoxide Interaction with Oxygen Preliminarily Adsorbed on Smooth and Platinized Platinum Electrodes

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Abstract

Variations of potential E in time τ, observed during the carbon monoxide interaction with preliminarily-adsorbed oxygen Oads on smooth and platinized platinum electrodes under open-circuit conditions (supporting electrolyte 0.5 M H2SO4), are measured. The potential decay rate on smooth Pt is more than ten times that on Pt/Pt; there are some differences in the transients as well. The obtained data suggest that CO interacts with Oads on smooth Pt and Pt/Pt via different mechanisms. Two models for the process on smooth platinum are considered. In one model, the interaction of Oads with CO from solution is accepted as the rate-determining step; in the other, the interaction of Oads with COads. A comparison of theoretical E vs. τ dependences with experimental data using the MathCad program suggests that CO interacts with Oads via both mechanisms.

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Authors and Affiliations

  1. Moscow State University, Vorob'evy gory, Moscow, 119899, Russia

    B. I. Podlovchenko, R. A. Manzhos & Yu. M. Maksimov

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  1. B. I. Podlovchenko
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  2. R. A. Manzhos
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  3. Yu. M. Maksimov
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Podlovchenko, B.I., Manzhos, R.A. & Maksimov, Y.M. Transients of the Open-Circuit Potential during Carbon Monoxide Interaction with Oxygen Preliminarily Adsorbed on Smooth and Platinized Platinum Electrodes. Russian Journal of Electrochemistry 38, 1292–1298 (2002). https://doi.org/10.1023/A:1021612504112

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