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Electrochemical behavior of copper in 1-butyl-3-methylimidazolium bromide-copper(II) bromide binary ionic liquid

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Abstract

The methods of potentiometry, voltammetry, and gravimetry are used to study the electrochemical behavior of copper in the BMImBr-CuBr2 ionic liquid (0–30.5 mol % CuBr2). It is shown that electrochemical reduction of copper(II) occurs irreversibly, in two one-electron stages (transfer coefficient α of the cathodic process are 0.58 and 0.46, accordingly, for the first and second stages). Diffusion coefficients of copper-containing ions D Cu(II) at 60°C are 1.3 × 10−7 and 1.6 × 10−7 cm2 s−1 in melts with the CuBr2 concentration of 0.1 and 1.5 mol kg−1 of BMImBr, accordingly. High (up to 98%) deposition efficiency and high-quality copper deposit can be obtained in the potential range of −2.0 to −1.8 V (vs. a platinum quasireference electrode). It is found that the copper corrosion rate grows at an increase in the CuBr2 concentration in the binary melt and is comparable with that in aqueous solutions of H2SO4-CuSO4.

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Authors and Affiliations

  1. Krestov Institute of Chemistry of Solutions, Russian Academy of Sciences, ul Akademicheskaya 1, Ivanovo, Russia

    E. P. Grishina, A. M. Pimenova, N. O. Kudryakova & L. M. Ramenskaya

  2. Ivanovo State Chemical Technology University, pr. F. Engelsa 7, Ivanovo, Russia

    E. P. Grishina

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  1. E. P. Grishina
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  2. A. M. Pimenova
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  3. N. O. Kudryakova
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  4. L. M. Ramenskaya
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Correspondence to E. P. Grishina.

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Original Russian Text © E.P. Grishina, A.M. Pimenova, N.O. Kudryakova, L.M. Ramenskaya, 2012, published in Elektrokhimiya, 2012, Vol. 48, No. 12, pp. 1279–1284.

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Grishina, E.P., Pimenova, A.M., Kudryakova, N.O. et al. Electrochemical behavior of copper in 1-butyl-3-methylimidazolium bromide-copper(II) bromide binary ionic liquid. Russ J Electrochem 48, 1166–1170 (2012). https://doi.org/10.1134/S102319351212004X

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  • DOI: https://doi.org/10.1134/S102319351212004X

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