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Adsorption of thallium cations on RuO2–TiO2 electrodes

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Abstract

The electrochemical ion-exchange properties of RuO2–TiO2 film electrodes with different composition have been studied in acidic and alkaline media. Thallium-cation uptake has been observed only from the latter and its extent was found to be a function of electrode potential and composition. At potentials near 0.0 V (RHE), the amount of adsorbed Tl+ exhibited a maximum, and decreased with increasing potential, reaching a broad minimum in the range 0.4–0.8 V. A further increase in the electrode potential, above about 1.0 V, led to an increase of adsorbed thallium species, essentially due to deposition of a few layers of Tl(III) hydroxide. In fact, the release of the latter species was found to be much slower than that of thallium ions adsorbed at 0.0 V. For the latter, in turn, the double injection/ejection mechanism, currently accepted to explain the charge-storage in oxide electrodes, seems to be confirmed. The high Γ values attained at 0.0 V indicate that the large ionic radius of Tl+ does not prevent its diffusion through the thinner pore texture of the oxide coatings, possibly because of its poor hydration, related with lower charge density at the ion surfaces.

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Authors and Affiliations

  1. Dipartimento di Chimica dell’Università, via L. Borsari, 46, Ferrara, I-44100, Italy

    S. Ferro, M. Donatoni & A. De Battisti

  2. A.N. Frumkin Institute of Physical Chemistry and Electrochemistry, Russian Academy of Sciences, Moscow, Russia

    V. N. Andreev

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  1. S. Ferro
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  2. M. Donatoni
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  3. A. De Battisti
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  4. V. N. Andreev
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Correspondence to A. De Battisti.

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Ferro, S., Donatoni, M., De Battisti, A. et al. Adsorption of thallium cations on RuO2–TiO2 electrodes. J Appl Electrochem 37, 1389–1394 (2007). https://doi.org/10.1007/s10800-007-9417-y

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  • DOI: https://doi.org/10.1007/s10800-007-9417-y

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