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The kinetics of electroreduction of europium(III) cations at bismuth single-crystal electrode

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Abstract

Electroreduction of Eu(ClO4)3 and Eu2(SO4)3 has been studied at electrochemically polished \( {\text{Bi}}\left( {01\bar{1}} \right) \) single-crystal electrode in an acidic HClO4 or H2SO4 (pH ~3) aqueous solution with LiClO4 or Na2SO4 additions as a surface inactive electrolyte. The Eu3+ cations electroreduction rate depends on the electrode potential applied and the concentration of the supporting electrolyte as well as the concentration of the Eu3+ ions. At the more negative electrode potentials than the zero charge potential (zcp), the diffusion current plateaus were observed. The values of the rate constant for the heterogeneous reaction calculated at zcp are independent of the base electrolyte concentration studied. Analysis of the kinetic data corrected for the electrical double-layer effect shows that the coincidence of the corrected Tafel plots can be achieved, assuming that the effective charge of a reactant (+1.6) is significantly lower than it would be expected (z A = +3).

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Acknowledgments

This work was supported in part by the Estonian Science Foundation under Projects no. 8267, 8357, and 6970 and by the Estonian Ministry of Education and Science Project SF018002s08.

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Authors and Affiliations

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

    Eneli Härk, Rutha Jäger, Karmen Lust, Heili Kasuk & Enn Lust

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  1. Eneli Härk
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  2. Rutha Jäger
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  3. Karmen Lust
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  4. Heili Kasuk
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  5. Enn Lust
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Correspondence to Enn Lust.

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Härk, E., Jäger, R., Lust, K. et al. The kinetics of electroreduction of europium(III) cations at bismuth single-crystal electrode. J Solid State Electrochem 16, 921–926 (2012). https://doi.org/10.1007/s10008-011-1443-3

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  • DOI: https://doi.org/10.1007/s10008-011-1443-3

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