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Anomalous currents under cyclic polarization of magnetite electrode in acidic medium

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Abstract

An anomalous phenomenon was observed in acidic solutions in cyclic voltammetric curves in the studies of electrochemical behavior of magnetite. It consisted in appearance of the reverse current: a cathodic response under the anodic potential sweep. It was shown that the direct and reverse currents follow the same regularities. Analysis of experimental data allows concluding that both currents correspond to the same process: Fe3O4 + 8H+ + 2e → 3Fe 2+aq + 4H2O. Appearance of anomalous currents on polarization curves of magnetite occurs if the following conditions are observed: irreversibility of the given electrochemical reaction under the given mode experimental parameters; incompleteness of reaction at the cathodic halfcycle stage; layer-by-layer dissolution when the electrode surface is continually refreshed.

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Authors and Affiliations

  1. Ural State Economic University, ul. 8 Marta 62, Ekaterinburg, 620219, Russia

    G. A. Kozhina & A. N. Ermakov

  2. Ural State Agricultural Academy, ul. Karla Libknekhta 42, Ekaterinburg, 620075, Russia

    V. B. Fetisov

  3. Institute of Metallurgy, Ural Branch, Russian Academy of Sciences, ul. Amundsena 16, Ekaterinburg, 620016, Russia

    A. V. Fetisov

Authors
  1. G. A. Kozhina
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  2. A. N. Ermakov
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  3. V. B. Fetisov
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  4. A. V. Fetisov
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Correspondence to G. A. Kozhina.

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Original Russian Text © G.A. Kozhina, A.N. Ermakov, V.B. Fetisov, A.V. Fetisov, 2012, published in Elektrokhimiya, 2012, Vol. 48, No. 5, pp. 584–589.

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Kozhina, G.A., Ermakov, A.N., Fetisov, V.B. et al. Anomalous currents under cyclic polarization of magnetite electrode in acidic medium. Russ J Electrochem 48, 532–537 (2012). https://doi.org/10.1134/S1023193512050072

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  • DOI: https://doi.org/10.1134/S1023193512050072

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