Couple axial gradients of potential and concentration in a cylindrical pore electrode: an impedance model - Sorbonne Université
Journal Articles Journal of electroanalytical chemistry and interfacial electrochemistry Year : 1985

Couple axial gradients of potential and concentration in a cylindrical pore electrode: an impedance model

Abstract

The impedance of a cylindrical pore electrode in the case where the potential gradient due to the electrolyte resistivity is coupled to the axial concentration gradient of reacting species has been calculated semi-analytically from the approximate solution reported previously for the steady-state concentration and current profiles in the pore. Complex plane impedance plots, computed by an iteration technique for the transmission line, indicate: (i) a quasi-semi-circular diffusion loop at low frequencies due to diffusion control; and (ii) a high frequency loop in which the frequency dispersion is strongly dependent on the electrode parameters (electrolyte resistivity, diffusion coefficient of the reacting species, pore depth, Tafel coefficient of the electrochemical reaction and overall current flowing through the pore).

Dates and versions

hal-04662906 , version 1 (26-07-2024)

Identifiers

Cite

Chantal Cachet, Robert Wiart. Couple axial gradients of potential and concentration in a cylindrical pore electrode: an impedance model. Journal of electroanalytical chemistry and interfacial electrochemistry, 1985, 195 (1), pp.21-37. ⟨10.1016/0022-0728(85)80002-4⟩. ⟨hal-04662906⟩
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