Transients of the Open-Circuit Potential during Carbon Monoxide Interaction with Oxygen Preliminarily Adsorbed on Smooth and Platinized Platinum Electrodes |
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Authors: | B I Podlovchenko R A Manzhos Yu M Maksimov |
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Institution: | (1) Moscow State University, Vorob'evy gory, Moscow, 119899, Russia |
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Abstract: | Variations of potential E in time , 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. dependences with experimental data using the MathCad program suggests that CO interacts with Oads via both mechanisms. |
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