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Role of ohmic losses in appearance of dynamic instabilities in model electrochemical system with cylindrical electrode under potentiostatic conditions

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Abstract

The impedance spectroscopy technique was used for theoretical studies of the conditions of appearance of Hopf instability and saddle-node instability in a model electrochemical system with a preceding homogeneous chemical reaction in the Nernst diffusion layer and electrocatalytic reaction on the surface of a cylindrical electrode under potentiostatic conditions. It is shown that the value of the ohmic resistance parameter in the system can affect the number of bifurcation points and bifurcation frequency. An increase in the ohmic resistance parameter results in the narrowing of the region of Hopf bifurcation giving rise to spontaneous periodical current oscillations and expansion of the region of saddle-node instability leading to bistability. There are threshold values of the ohmic resistance parameters critical for appearance and disappearance of the dynamic instabilities under consideration.

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Authors and Affiliations

  1. Vernadskii Institute of General and Inorganic Chemistry, National Academy of Sciences of Ukraine, Kiev, Ukraine

    V. V. Pototskaya

  2. Chuiko Institute of Surface Chemistry, National Academy of Sciences of Ukraine, Kiev, Ukraine

    O. I. Gichan

Authors
  1. V. V. Pototskaya
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  2. O. I. Gichan
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Corresponding authors

Correspondence to V. V. Pototskaya or O. I. Gichan.

Additional information

Original Russian Text © V.V. Pototskaya, O.I. Gichan, 2014, published in Elektrokhimiya, 2014, Vol. 50, No. 11, pp. 1123–1134.

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Pototskaya, V.V., Gichan, O.I. Role of ohmic losses in appearance of dynamic instabilities in model electrochemical system with cylindrical electrode under potentiostatic conditions. Russ J Electrochem 50, 1009–1019 (2014). https://doi.org/10.1134/S1023193514110081

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  • DOI: https://doi.org/10.1134/S1023193514110081

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