Differential conductance of an electrolytic cell in the presence of deposition of a coating material on the electrode

Saracco, Guido; Alexe-Ionescu, A.L.; Barbero, Giulia

doi:10.1016/j.jelechem.2015.01.026

Cited by 1 publication

(3 citation statements)

References 40 publications

(52 reference statements)

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“…According to (3) the effective resistance and capacitance of the surface layer are the parallel of the surface resistances and capacitances of the covered and uncovered parts [15]. We indicate by the thickness of the surface layer, c and nc the resistivity and by ε c and ε nc the dielectric constant of the covered and uncovered parts.…”

Section: Real Cellmentioning

confidence: 99%

“…These bubbles change the properties regulating the exchange of charge from the bulk and the external circuit, and hence the electrical properties of the interface bulk-electrode [15]. We assume that the kinetic of the formation of bubble on the electrode is described by…”

Section: Kinetic Equation For the Covering Effectmentioning

confidence: 99%

“…We assume that the electrical response of the working cell can be described by an electrical circuit formed by a bulk resistance in series with a surface layer characterized by a resistance and a capacitance [14]. Due to the adsorption phenomenon, the surface resistance and capacitance are the parallel of the covered and uncovered parts [15]. In this framework we show that the time dependence of the current contains two characteristics time: one short, related to the charging of the surface layer, and one long related to the kinetics of the coverage.…”

Section: Introductionmentioning

confidence: 99%

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A model for electrode effects based on adsorption theory

Gliozzi

Hernández

Alexe-Ionescu

et al. 2015

Electrochimica Acta

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a b s t r a c tA model to describe the electrode effects based on the adsorption theory is proposed. We assume that the coverage (i.e by gas bubbles, electrodeposition of compounds, etc) of the electrodes is governed by a kinetics equation where the adsorption term is proportional to the bulk current density, and the desorption term to the actual coverage. The adsorption can take place only on the uncovered part of the electrode. We show that the coverage is responsible for a variation of the interface properties of the electrode. The time dependence of the electric response of the cell, submitted to an external voltage, is determined by solving the differential equation for the coverage. We show that two regimes are expected. One, in the limit of small time, controlled by the charging of the surface interface, and one related to the coverage. The theoretical predictions are in reasonable agreement with the experimental data concerning the time dependence of the current and the current-voltage characteristics of a home-made photo-electrolyzer constituted by a BiVO 4 photoanode and a Pt cathode. Moreover, a normalized current-voltage curve was obtained, which fit also literature data based on (i) electrolysis on cylindrical stainless-steel electrodes in NaOH electrolyte and (ii) electrolytic plasma nitrocarburizing of AISI 1020 steel discs in an Urea-based aqueous solution, demonstrating the versatility and broad range of application of the here proposed model.

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Section: Real Cellmentioning

confidence: 99%

Section: Kinetic Equation For the Covering Effectmentioning

confidence: 99%