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Electrical double layer and adsorption of iodide ions at the Bi|ethylene carbonate interface

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Abstract

The adsorption of I− anions on the Bi(111) single-crystal plane from solutions in ethylene carbonate has been investigated by impedance measurement method. The ionic charge due to the specific adsorption has been obtained by integration of differential capacitance curves, and the Gibbs excess has been calculated using the mixed-electrolyte method applied for both electrode charge and electrode potential as the independent electrical variables. The Gibbs energy of I− anion adsorption has been calculated using the virial adsorption isotherm. It was found that under comparable conditions, the results obtained at constant electrode potential and at constant electrode charge were coincident. The Gibbs energy of I− anion adsorption and the calculated electrosorption valency value were found to be very close to these values obtained in propylene carbonate.

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Acknowledgments

This research was supported by the EU through the European Regional Development Fund (Centres of Excellence 3.2.0101-0030 and 2014-2020.4.01.15-0011) and Institutional Research Grant No. IUT20-13.

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Authors and Affiliations

  1. Institute of Chemistry, University of Tartu, Ravila 14a, 50411, Tartu, Estonia

    Mart Väärtnõu & Enn Lust

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  1. Mart Väärtnõu
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  2. Enn Lust
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Correspondence to Mart Väärtnõu.

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Väärtnõu, M., Lust, E. Electrical double layer and adsorption of iodide ions at the Bi|ethylene carbonate interface. J Solid State Electrochem 21, 193–201 (2017). https://doi.org/10.1007/s10008-016-3358-5

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  • DOI: https://doi.org/10.1007/s10008-016-3358-5

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