Impedance de diffusion d'un disque tournant en regime hydrodynamique laminaire. Etude experimentale et comparaison avec le modele de nernst

Reaction Model for Iron Dissolution Studied by Electrode Impedance: II . Determination of the Reaction Model

“…However, this is not the only possible origin of the electrode impedance: it is well known that mass transport, if it intervenes in the overall reaction rate, contributes to the electrode impedance (6). In passivity, the growth of the oxide film gives rise to a capacitive or inductive impedance (7).…”

“…[6] is considered valid for ~ < 0.2 or 0 > 0.8 and a more elaborate isotherm might be taken into consideration at intermediate 8 values. It may be expected that by using a more elaborate isotherm, complicated results can be interpreted on the basis of simple models, at least for steady-state polarization curves (34,35).…”

Impedance spectroscopy data for anions electroreduction kinetics at Cd(0001) plane electrode

“…1(b) and 3(b), because the Nyquist plots do not show all details [11][12][13][14][15][16][17][18][19][20][21][22][23]. On the other hand, the complex impedance |Z| and d, log f plots (so-called Bode plots) contain all the necessary information.…”

“…where j F is the Faradaic current density, k f and k b are the forward and reverse rate constants, z is the charge number of the electrons transferred in reaction, c Ox and c Red are the concentrations of reactant (oxidiser) and product (reductant), respectively [9][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24]. Using impedance spectroscopy method, the current is composed of a steady-state (or direct) part (determined by the mean dc potential E and the mean dc concentrations at the interface, c Ox and c Red ) and an ac part Dj F (determined by the ac perturbing signal DE and concentration fluctuations, Dc Ox and Dc Red ).…”

“…Using impedance spectroscopy method, the current is composed of a steady-state (or direct) part (determined by the mean dc potential E and the mean dc concentrations at the interface, c Ox and c Red ) and an ac part Dj F (determined by the ac perturbing signal DE and concentration fluctuations, Dc Ox and Dc Red ). The Faradaic impedance is given by the ratio of the Laplace transform of the ac parts of the voltage and current density [10][11][12][13][14][15][16][17][18][19][20][21][22][23][24] …”