Rotating waves on disk and ring electrodes

Otterstedt, Ralph D.; Plath, P; Jaeger, N. I.; Hudson, John L.

doi:10.1039/ft9969202933

Cited by 47 publications

(31 citation statements)

References 23 publications

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“…2 Because the potential distribution in the electrolyte depends on the conductivity and the cell geometry (i.e., size of the working electrode, geometrical positions of working, reference and counter electrodes), the strength and the scale of the coupling also are functions of these quantities. Several interesting spatiotemporal phenomena have been observed, e.g., accelerating fronts, 7,8 standing and traveling waves, 6,9-11 rotating waves, 12 spatial period-doublings, [13][14][15] spirals, [16][17][18] and Turing patterns. 5 With increasing the coupling strength in the oscillatory region transitions from unsynchronized periodic behavior through irregular and periodic clusters 19 to synchronized oscillations [19][20][21][22] have been observed.…”

Section: Introductionmentioning

confidence: 99%

Phase synchronization of nonidentical chaotic electrochemical oscillators

Kiss

Hudson

2002

Phys. Chem. Chem. Phys.

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Experiments on two coupled chaotic electrochemical oscillators with different frequencies are presented. We consider two types of coupling. The first is imposed through a set of external resistors. The second arises from the potential drop in the electrolyte and generally depends on cell geometry and reaction rate. Phase synchronization is observed with the addition of weak coupling of both types. Along with the onset of phase synchronization an increase in the amplitude of the mean current oscillations occurs. Simulations using a coupled form of an electrochemical model support the experimental findings.

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Section: Introductionmentioning

confidence: 99%

Phase synchronization of nonidentical chaotic electrochemical oscillators

Kiss

Hudson

2002

Phys. Chem. Chem. Phys.

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“…2.43, confirms that conclusion. Another example is the electrodissolution of Co in acidic media [27,52]. In further studies, Lee et al [59] have analyzed the oscillatory oxidation of formic acid on a Pt electrode modified by Bi deposition, using the ring Pt electrode.…”

Section: Patterns In Hcooh Oxidationmentioning

confidence: 99%

“…This modulation leads to an additional (intermittent) acceleration of the leading edge and explains an increase in the total current. When the shape of the cobalt electrode was changed to the disk or the ring geometry [27], the rotating waves were recorded during the anodic oxidation of such electrodes in buffered phosphate solutions media. The experiments were performed under potentiostatic conditions.…”

Section: Patterns In Co Electrodissolutionmentioning

confidence: 99%

“…The latter effect is particularly strongly pronounced if WE and RE are positioned close to each other, as in the case of application of a Haber-Luggin capillary, minimizing the ohmic potential drop between WE and RE [19][20][21]. In fact, Otterstedt, Hudson et al [27] were the first who reported such spatiotemporal phenomena for the anodic dissolution of Co (see Sect. 2.3).…”

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confidence: 93%

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Experimental and Model Spatiotemporal and Spatial Patterns in Electrochemical Systems

Orlik

2012

Self-Organization in Electrochemical Systems II

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“…For example, Otterstedt et al studied the dissolution of cobalt ring and disk electrodes and detected fronts that rotated around a central reference electrode. 25,26 More recently, rotating spiral waves have been observed under open-circuit conditions on nitric acid covered, low-carbon steel plates. 27 These vortices are similar to spiral waves in reaction-diffusion systems.…”

Section: Introductionmentioning

confidence: 99%

Electrochemical Waves on Patterned Surfaces: Propagation through Narrow Gaps and Channels

2001

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The dissolution and corrosion of iron and certain types of steel can involve the propagation of electrochemical waves. Low-carbon steel plates covered by nitric acid solutions self-organize pseudo-two-dimensional wave patterns which share many features with reaction-diffusion waves in excitable systems. Here, we investigate the dynamics of these electrodissolution waves in the presence of geometrical constraints. A simple procedure for the preparation of insulating, millimeter-scale obstacles is presented, which allows the controlled, local protection of the metal surface. This method is used in the measurement of the material consumption rate per wave [(850 ( 50) nm/wave or 6-7 g/(m 2 wave)] as well as for the study of front propagation through narrow gaps and long channels. In channels, the wave velocity decreases with decreasing width from 10 to 4 mm/s. Propagation failures occur within the channel if its width is smaller than 0.2-0.4 mm. These results indicate that the obstacles have sink-like boundaries. For the estimation of the critical nucleation size in this system, we prepared short and narrow gaps that induce wave blockage for openings smaller than 0.65 ( 0.1 mm.

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Rotating waves on disk and ring electrodes

Cited by 47 publications

References 23 publications

Phase synchronization of nonidentical chaotic electrochemical oscillators

Phase synchronization of nonidentical chaotic electrochemical oscillators

Experimental and Model Spatiotemporal and Spatial Patterns in Electrochemical Systems

Electrochemical Waves on Patterned Surfaces: Propagation through Narrow Gaps and Channels

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