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On the origin of frequency dispersion at the interface between mercury electrode and aqueous solutions of alkali halides

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Abstract

The origin of frequency dispersion of electrochemical impedance is investigated at the interface of mercury and aqueous solutions of single alkali halides. It is found that in the presence of each one of KI, CsI, CsF and CsBr salts, the interface presents certain potential regions where frequency dispersion effects are detected and others where the ideal capacitor behavior is closely approximated. Frequency dispersion effects are contributed by interfacial processes such as anion and cation adsorption, mercury halide film formation and dissolution and charge transfer reactions. The discrimination between frequency dispersion due to charge transfer processes occurring at the Hg/solution interface and that due to reactant adsorption itself is generally difficult and depends on the reaction mechanism, provided that a discrete adsorption step is anticipated.

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Authors and Affiliations

  1. Department of Chemistry, Aristotle University of Thessaloniki, 54124, Thessaloniki, Greece

    A. G. Anastopoulos & A. A. Papaderakis

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  1. A. G. Anastopoulos
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  2. A. A. Papaderakis
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Correspondence to A. G. Anastopoulos.

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Published in Russian in Elektrokhimiya, 2014, Vol. 50, No. 1, pp. 78–88.

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Anastopoulos, A.G., Papaderakis, A.A. On the origin of frequency dispersion at the interface between mercury electrode and aqueous solutions of alkali halides. Russ J Electrochem 50, 70–79 (2014). https://doi.org/10.1134/S102319351302002X

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  • DOI: https://doi.org/10.1134/S102319351302002X

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