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Electrochemical impedance of microelectrodes

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Abstract

The influence of the radius (10 <a < 1500 μm) of a Pt disk electrode on the impedance frequency spectrum of the [Fe(CN)6]3-/4- reversible system is studied in the frequency range 5 × 10-3 to 103 Hz. The impedance is calculated by applying the Fourier transform to potential and current pulses of various lengths obtained when imposing a step potential. For electrodes witha < 100 μm, the spectrum in the complex plane has the form characteristic of microelectrodes, while for electrodes of higher radii, it corresponds to a finite Warburg impedance. The main impedance parameters, such as the charge transfer resistance, the diffusion resistance, and the frequency in the maximum of the imaginary constituent are determined. The latter decreases with an increase ina by the lawf* ∼ 1/a2 at lowa and is independent ofa on electrodes witha > 100 μm, which agrees with the impedance theory for microelectrodes

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Authors and Affiliations

  1. Frumkin Institute of Electrochemistry, Russian Academy of Sciences, Leninskii pr. 31, 117071, Moscow, Russia

    Z. A. Rotenberg, A. V. Dribinskii, V. P. Lukovtsev & N. S. Khozyainova

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  1. Z. A. Rotenberg
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  2. A. V. Dribinskii
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  3. V. P. Lukovtsev
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  4. N. S. Khozyainova
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Rotenberg, Z.A., Dribinskii, A.V., Lukovtsev, V.P. et al. Electrochemical impedance of microelectrodes. Russ J Electrochem 36, 879–882 (2000). https://doi.org/10.1007/BF02757062

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  • DOI: https://doi.org/10.1007/BF02757062

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