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Halandri, Greece

Karantonis A.,National Technical University of Athens | Karaoulanis D.,21 Korai str.
Electrochimica Acta | Year: 2011

A generalized transfer function is introduced, defined as the ratio of the phasor of the electrode potential to the phasor of the applied potential. The occurrence of a maximum of this transfer function at a particular frequency is defined in this work as electrochemical resonance under potentiostatic control. The electrochemical resonance conditions are derived for an electrochemical system in steady state of a stable focus type, characterized by an eigenfrequency ω0. The resulting relations are explored and compared with the response of the electric parameters (impedance and admittance). The theoretical considerations are supported by experimental findings. © 2011 Elsevier Ltd. All rights reserved. Source


Karaoulanis D.,21 Korai str. | Chryssafidis P.,National Technical University of Athens | Karantonis A.,National Technical University of Athens
Journal of Solid State Electrochemistry | Year: 2015

The resonating properties of the electrochemical interface are studied under harmonic perturbations in galvanostatic control and under chaotic perturbations in potentiostatic control. The resonance conditions in galvanostatic control are derived analytically and explored numerically. The theoretical findings are confirmed experimentally for the Ni | 1 M H2SO4 system. The implementation of a Rössler and a Chua chaotic perturbation to an electrochemical resonator is explored numerically. It is shown that the electrochemical resonator acts effectively as a band pass filter thus enhancing the periodicity of the chaotic input. © 2015, Springer-Verlag Berlin Heidelberg. Source


Karantonis A.,National Technical University of Athens | Bourbos E.,National Technical University of Athens | Karaoulanis D.,21 Korai str.
Electrochimica Acta | Year: 2013

The ability of electrochemical interfaces to exhibit electric resonance and antiresonance is studied experimentally. The system under investigation is the electrodissolution of iron in sulfuric acid. The impedance of the system in the vicinity of a Hopf bifurcation is studied while the system rests on a steady state of a stable focus type. The frequency response is explored for different values of the solution concentration as well as different external ohmic resistance values. It is shown that the system undergoes electrical resonance and antiresonance at frequency values determined by the system parameters and thus acts as a resonator (band-pass filter) or wave trap (band-stop filter). Source


Karantonis A.,National Technical University of Athens | Karaoulanis D.,21 Korai str.
Electrochimica Acta | Year: 2012

Resonating and antiresonating properties of electrochemical interfaces are explored. A general model for the electrochemical interface is employed in order to derive the conditions when the admittance exhibit a minimum (electrical antiresonance) or a maximum (electrical resonance) at a specific input frequency. The electrochemical interface functions as a band-pass filter under resonance and as a band-stop filter under antiresonance. © 2012 Elsevier Ltd. Source

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