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Simulating Unstable States during the Coumarin Adsorption on a Mercury Electrode

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Abstract

Dependences of differential capacitance C on potential E of a stationary electrode (hanging mercury drop) in aqueous 0.1 M NaF solutions containing 4.6 × 10–4 to 3 × 10–3 M C9H6O2 are obtained using an automatic impedancemeter. At coumarin concentrations below 0.001 M and potential slowly scanned near –1.1 V (SCE) the capacitance is unstable, which results in differently-shaped C vs. E curves in this potential range. The obtained results are attributed to nonequilibrium phase transitions in the adsorption layer, during which the orientation of coumarin molecules at the electrode surface alters. These phenomena are explained semiquantitatively on the basis of a developed theory.

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Authors and Affiliations

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

    B. B. Damaskin & O. A. Baturina

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  1. B. B. Damaskin
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  2. O. A. Baturina
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Damaskin, B.B., Baturina, O.A. Simulating Unstable States during the Coumarin Adsorption on a Mercury Electrode. Russian Journal of Electrochemistry 38, 1141–1147 (2002). https://doi.org/10.1023/A:1020612005386

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  • DOI: https://doi.org/10.1023/A:1020612005386

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