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Variations in the Charge and Open-Circuit Potential of a Platinum Electrode during Adsorption of Iodine and Iodide Ions

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Abstract

The adsorption of iodine and iodide anions on a Pt/Pt electrode (0.5 M H2SO4 as a supporting solution) is compared using potentiodynamic and galvanostatic charging curves, transients of the current and open-circuit potential (OCP), and analytical measurements. Variations in the charge and OCP during the adsorption obey relationships derived for strong adsorption of neutral species and ions on a hydrogen electrode with the formation of irreversibly adsorbed atoms. The main product of the I2 and I– chemisorption in acid solutions is adsorbed iodine atoms. However, adsorption of iodine occurs in noticeable amounts and above a monolayer in the form of species that undergo electrodesorption during a cathodic polarization to potentials of the beginning of hydrogen adsorption. In the presence of a monolayer of adsorbed iodine atoms, potential of the zero total charge of a Pt/Pt electrode is in the oxygen adsorption region.

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

    B. I. Podlovchenko & E. A. Kolyadko

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  1. B. I. Podlovchenko
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  2. E. A. Kolyadko
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Podlovchenko, B.I., Kolyadko, E.A. Variations in the Charge and Open-Circuit Potential of a Platinum Electrode during Adsorption of Iodine and Iodide Ions. Russian Journal of Electrochemistry 36, 1268–1274 (2000). https://doi.org/10.1023/A:1026695412672

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