On the onset of current oscillations at the limiting current region emerged during iron electrodissolution in sulfuric acid solutions

Sazou, Dimitra; Pagitsas, Michael

doi:10.1016/j.electacta.2006.04.010

Cited by 29 publications

(38 citation statements)

References 61 publications

(140 reference statements)

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“…Since electrochemical oscillations are induced by a minimal IR drop 2,8 and the limiting current has a Levichtype square-root dependence on the rotation rate, 11 it is quite reasonable that the resistance at which oscillations arise scales with the inverse square root of the rotation rate. Therefore, the derived scaling relationship (eqn (7)) can be considered as a dynamical Levich-type equation for oscillatory electrochemical systems.…”

Section: Discussionmentioning

confidence: 99%

“…The relationship defined by eqn (7) can be interpreted qualitatively with the assumption that there is a minimal IR = constant potential drop, which is required to induce oscillations. 8 According to the Levich equation 11 the current will be proportional to d…”

Section: Analytical Prediction: a Scaling Relationship For Ndr-type Ementioning

confidence: 99%

“…[5][6][7] The minimal IR drop was experimentally measured for iron electrodissolution for different sulfuric acid concentrations and rotation rates. 8 These observations are expected to hold for a large class of electrochemical systems, because the underlying mechanisms (presence of NDR with sufficient external IR drop) are common features of electrochemical oscillations. We have proposed a non-traditional phase diagram with the use of impedance spectroscopy: the oscillatory regions were mapped in the electrode potential vs. external resistance parameter plane 9 and thus were independent of the presence of IR drop in the cell.…”

Section: Introductionmentioning

confidence: 99%

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Scaling relationship for oscillating electrochemical systems: dependence of phase diagram on electrode size and rotation rate

Kiss

Kazsu

Gáspár

2009

Phys. Chem. Chem. Phys.

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Dynamics of oscillations in electrochemical systems are affected by both chemical and physical properties of the systems. Chemical properties include the type of electrochemical reaction, the electrode material, the composition of the electrolyte, etc., while physical properties include the solution resistance, the cell constant, the electrode size, the rotation rate, the external resistance, etc. Earlier, we proposed the application of cell-geometry-independent phase-diagrams to characterize the oscillatory regions in the electrode potential vs. external resistance parameter plane. In this report, we investigate how this type of phase diagram changes with the surface area (electrode radius) and the rotation rate of an electrode. Based on linear stability analysis of a general, two-variable model for negative-differential resistance (NDR) type electrochemical oscillators we propose a scaling relationship. It predicts that all scaled data points derived from the critical values of parameters (resistance and potential) characterizing the onset of oscillations should fall-independently of the size of the electrode and the rotation rate-on a single plot. The analytical predictions are tested in both numerical simulations and experiments with copper electrodissolution in phosphoric acid.

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Section: Discussionmentioning

confidence: 99%

Section: Analytical Prediction: a Scaling Relationship For Ndr-type Ementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Scaling relationship for oscillating electrochemical systems: dependence of phase diagram on electrode size and rotation rate

Kiss

Kazsu

Gáspár

2009

Phys. Chem. Chem. Phys.

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“…3a) (Sazou & Pagitsas, 2006b). Supersaturation conditions of the ferrous salts established inside pits results in a density gradient Δd between the solution in the interfacial regime in front of the Fe electrode and the bulk solution.…”

Section: Oscillatory Phenomena As a Probe To Study Pitting Corrosion mentioning

confidence: 99%

“…Limiting current region (LCR) where, under proper conditions, current oscillations may occur (Geraldo et al, 1998;Kiss et al, 2006;Kleinke, 1995;Sazou et al, 2000b;Sazou et al, 2000c;Sazou & Pagitsas, 2006b) beyond the peak potential, E p and before the establishment of a steady transport-controlled LCR within which formation-dissolution of the ferrous salt, FeSO 4 ⋅ 7H 2 O proceeds at equal rates, according to the overall reaction,…”

Section: Electrochemical Behavior Of the Fe|h 2 So 4 Systemmentioning

confidence: 99%

Oscillatory Phenomena as a Probe to Study Pitting Corrosion of Iron in Halide-Containing Sulfuric Acid Solutions

Sazou¹,

Pavlidou²,

Diamantopoulou³

et al. 2012

Pitting Corrosion

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The Growth of an Electrochemical Garden on a Zinc Electrode

2021

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The far‐from equilibrium precipitation reaction of chemical gardens can lead to the formation of biomimetic and complex structures providing a new route for the rational architectural design of functional materials. Inspired by recent developments in the field of chemical gardens, we put forward a new scientific question: “Is it possible to create an electrochemical garden?” By implementing state‐of‐the‐art electrochemical techniques and using the phenomenon of metal corrosion, we sculpture self‐organized structures on a zinc disc‐electrode surface by a mechanism similar to that of chemical gardens. A deeper search in the formation mechanism reveals that ion‐selective membranes are the driving force for the growth of an electrochemical garden. At last, electrochemical instabilities, introduced under proper conditions, result in the emergence of current oscillations in the region where electrochemical gardens were discovered. Current oscillations sculpture the electrode surface with a variety of self‐organized precipitate structures.

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On the onset of current oscillations at the limiting current region emerged during iron electrodissolution in sulfuric acid solutions

Cited by 29 publications

References 61 publications

Scaling relationship for oscillating electrochemical systems: dependence of phase diagram on electrode size and rotation rate

Scaling relationship for oscillating electrochemical systems: dependence of phase diagram on electrode size and rotation rate

Oscillatory Phenomena as a Probe to Study Pitting Corrosion of Iron in Halide-Containing Sulfuric Acid Solutions

The Growth of an Electrochemical Garden on a Zinc Electrode

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