Diffusion-migration capacitance in homogeneous membranes, modified electrodes and thin-layer cells

Comparison of Ir oxide film redox kinetics in sulfuric and p-toluene sulfonic acid solutions

“…The samples were attached to Al stubs with conducting carbon tape (Electron Microscopy Sciences) and were then sputter-coated with a ca. 30 …”

“…This is shown in Fig. 6 for the typical example of a 10 mC cm − 2 Ir oxide films in its predominantly oxidized state, (X o =0.8) and grown and studied in H 2 SO 4 [12,13,30,31], in that both electrons and ions are transported through them, yielding capacitive behavior at low frequencies, and transport controlled conditions Table 1 Characteristic impedance quantities for electron hopping and coupled electron-counter ion transport models [13,14] ): d, thickness of film (cm): F, Faraday constant (C/equiv): n e , number of electrons in reaction (equiv/mol): R, gas constant (J mol K): T, temperature (K): t e , t x , transport number of electrons and counter ion, respectively: z x , charge on counter ion (equiv/mol): i= 1+ (qm/RT):…”

“…5b) was used). An n value of 1 is seen for an ideal lf capacitor and reflects asymmetrical, finite (all Ir sites reacting) and planar transport conditions [14,30,33]. Deviations from ideal lf capacitive behavior are commonly observed, often to an even larger degree, for polymer systems [34].…”

Investigation of ion-selective electrodes with neutral ionophores and ionic sites by EIS. I. Theory

“…In the first step, a phase boundary potential model describes the concentration of the active ions in the membrane. Then, a kinetic model is described in terms of electrochemical impedance, where ionic transfers at the membranejsolution interfaces and diffusion of the species in the membrane are considered as rate-limiting steps [13][14][15][16][17][18]. This approach will allow the role of the various active species to be recognized and the performances of ISE to be improved.…”

General aperiodic equivalent circuit for charge permeable thin-layer cells of symmetric or asymmetric types Part 3 Mixed conductance, polymer electrolyte asymmetric cells

“…AL is the Ðlm volume, this capacitance is the conventional inÐnitely slow scan capacitance of classical theory 15. …”