Second-order Impedance in Electrode Kinetics |
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Authors: | Mishuk V Ya Elkin V V Abaturov M A Alekseev V N Grafov B M |
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Institution: | (1) Russian Academy of Sciences, Frumkin Institute of Electrochemistry, Leninskii pr. 31, Moscow, 117071, Russia |
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Abstract: | The kinetics of electrode reactions with a rather severe influence of the EDL structure is studied by nonlinear second-order impedance spectroscopy. Polarization impedance spectra and potential dependences of a nonlinear impedance are obtained for the reaction of electroreduction of the ferricyanide anion on the cadmium and bismuth electrodes in surface-inactive supporting NaF and Na2SO4 electrolytes. The results of measurements for the reaction Eu3+ + e Eu2+ on the bismuth and mercury electrodes are presented. It is shown that such important parameters of EDL as the potential of zero charge and the second derivative of potential with respect to the charge of the electrode surface can be determined directly from experimental curves even under conditions of occurrence of a faradaic process. |
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