Dynamical Instabilities in Electrochemical Processes

Kiss, István Z.; Nagy, Tímea; Gáspár, Vilmos

doi:10.1002/9783527635566.ch4

Cited by 24 publications

(20 citation statements)

References 201 publications

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“…Nonlinear dynamics of oscillatory and chaotic metal electrodissolution were studied both experimentally and theoretically by Vilmos Gáspár and István Z. Kiss at the University of Debrecen [25,26]. Nonequilibrium phase diagrams were constructed, and their dependence on various experimental parameters, such as mass transport conditions and solution resistance, etc., were determined.…”

Section: Finished Activitiesmentioning

confidence: 99%

Past and present of electrochemical science in Hungary

Pajkossy

2023

J Solid State Electrochem

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Section: Finished Activitiesmentioning

confidence: 99%

Past and present of electrochemical science in Hungary

Pajkossy

2023

J Solid State Electrochem

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“…Note that an N-NDR type exhibits only a current oscillation while an HN-NDR type does both current and potential oscillations. [17][18][19][20][21][22][23][24][25][26]…”

Section: Electrochemistry (In Press)mentioning

confidence: 99%

“…The oscillation is different from the reported ones in the literature, [9][10][11][12] because it is not caused by bubble growth and detachment. 14 Electrochemical oscillations, which are attractive phenomena from the viewpoint of dynamic self-organization of molecular systems, [15][16][17][18][19][20][21] have been classified into several categories based on oscillation mechanism. [17][18][19][20][21][22][23][24][25][26] It is established that an N-shaped negative differential resistance (N-NDR) plays crucial roles in the most typical oscillators, namely, N-NDR oscillator and "hidden" N-NDR (HN-NDR) oscillator.…”

Section: Introductionmentioning

confidence: 99%

Mechanism of Potential Oscillation during Electrolysis of Water in Acidic Solutions

et al. 2020

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We have previously reported that the hydrogen evolution reaction (HER) in acidic water electrolysis shows a potential oscillation with amplitude of about 1 V. The oscillation, named HER oscillation, is accompanied with a periodic change in the evolution rate of hydrogen bubbles, i.e., hydrogen bubbles evolve more vigorously at low potentials than at high potentials, which has led us to propose a mechanism for HER oscillation (J. Electroanal. Chem., 713, 39 (2014)). In order to obtain a deeper insight into the mechanism of HER oscillation, this present work studies the effect of high pressure (e.g. 0.7 MPa) on the oscillation and current-potential curves. It reveals that any N-shaped negative differential resistance characteristics are not involved in HER oscillation unlike the majority of electrochemical oscillations. It also shows that a solution-stirring effect due to the hydrogen bubble evolution, which causes an enhancement of convection near the electrode surface, plays an essential role in HER oscillation. We thus conclude that the appearance of HER oscillation can be explained by considering that the enhancement occurs only at low potentials at which hydrogen bubbles evolve vigorously.

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“…Electrochemical systems produce a wide range of dynamical behavior , in which the coupling among reacting sites has a profound effect on the self-organized features . Investigations have shown that a major form of coupling is the electrical interaction through potential drops in the electrolyte. , Various forms of stationary and oscillatory patterns have been observed on the surface of a single electrode , and assemblies of discrete electrodes. − In traditional macrocells, the geometry of the arrangement of the cathode, anode, and the reference electrode determines the strength and length-scale of the effective coupling. For example, by tuning the distance between working and reference electrodes in H 2 O 2 reduction on Pt and iron electrodissolution, transitions from asynchronous to synchronous oscillations have been observed in dual electrode configurations.…”

Section: Introductionmentioning

confidence: 99%

Spontaneously Synchronized Electrochemical Micro-oscillators with Nickel Electrodissolution

Jia

Kiss

2012

J. Phys. Chem. C

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We investigate the dynamical behavior of oscillatory electrodissolution of two nickel microwires in an on-chip integrated microfluidic flow cell. With equivalent circuit analysis, an equation is derived that shows that the electrical coupling strength between the electrodes can be intensified by increasing the distance from the downstream electrode to the reference/counter electrodes, increasing the electrode size, and decreasing the total resistance within the cell. Experiments and numerical simulations with an ordinary differential equation model show that by intensifying the coupling between the electrodes spontaneously synchronized oscillations occur due to large potential (IR) drop in the small flow channel. Experiments with different distances, electrode diameters, and total resistances confirm a correlation between the statistical entropy based synchrony index and the theoretically derived coupling strength formula. The findings thus show that dynamical features of the chemical reaction that have been previously seen with macroelectrodes with application of external coupling resistances can occur spontaneously with microwires. The delineation of coupling effects in the reaction system could facilitate kinetic and electroanalytical applications in design of microchip-based setups that require collector-generator multielectrode wires: the accuracy of the measurement can be improved by proper cell design that diminishes electrical cross talk.

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Dynamical Instabilities in Electrochemical Processes

Cited by 24 publications

References 201 publications

Past and present of electrochemical science in Hungary

Past and present of electrochemical science in Hungary

Mechanism of Potential Oscillation during Electrolysis of Water in Acidic Solutions

Spontaneously Synchronized Electrochemical Micro-oscillators with Nickel Electrodissolution

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