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  Spatial bifurcations of fixed points and limit cycles during the electrochemical oxidation of H2 on Pt ring-electrodes

Grauel, P., Varela, H., & Krischer, K. (2001). Spatial bifurcations of fixed points and limit cycles during the electrochemical oxidation of H2 on Pt ring-electrodes. Faraday Discussions, 120, 165-178. doi:10.1039/b103345j.

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2001
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 Urheber:
Grauel, Peter1, Autor           
Varela, Hamilton1, Autor           
Krischer, Katharina1, Autor           
Affiliations:
1Physical Chemistry, Fritz Haber Institute, Max Planck Society, ou_634546              

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Schlagwörter: bistable semiconductor system; reaction-diffusion-systems; pattern-formation; standing waves; oscillatory media; active media; instability; turbulence; dynamics; equilibrium
 Zusammenfassung: Pattern formation during the oscillatory oxidation of H-2 on Pt ring-electrodes in the presence of electrosorbing ions was studied under potentiostatic control for three different positions of the reference electrode (RE). The position of the RE crucially affects the degree of the global feedback which is imposed by the potentiostatic operation mode, and the three configurations selected corresponded to zero, maximum and intermediate global coupling. In the absence of global coupling, 'communication' among different positions occurs exclusively through migration coupling (the electrochemical counterpart to diffusion in reaction-diffusion systems). In this case, spatially inhomogeneous oscillations that were attributed to a spatial bifurcation of the homogeneous limit cycle were observed throughout. This implies that the system is Benjamin-Feir unstable. For the strongest global coupling adjustable, travelling pulses were found that emerged in a wave bifurcation with n = 1 from the homogeneous steady state. The pulses exhibited modulations in velocity and width that most likely resulted from the interaction between inhomogeneities of the catalytic surface and the nonlinear reaction dynamics. In the case of an intermediate global coupling strength, a diversity of spatio-temporal motions was observed. The dynamics ranged from pulses over target patterns and so-called asymmetric target patterns to mixed states where two or three of these states alternate. For some parameters these mixed states were in addition separated by bursts of the system to a nearly homogeneous unreactive state.

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Sprache(n): eng - English
 Datum: 2001-04-122001-11-122001-11
 Publikationsstatus: Erschienen
 Seiten: 14
 Ort, Verlag, Ausgabe: -
 Inhaltsverzeichnis: -
 Art der Begutachtung: Expertenbegutachtung
 Identifikatoren: eDoc: 289230
DOI: 10.1039/b103345j
 Art des Abschluß: -

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Titel: Faraday Discussions
  Kurztitel : Faraday Discuss.
Genre der Quelle: Zeitschrift
 Urheber:
Affiliations:
Ort, Verlag, Ausgabe: London : Royal Society of Chemistry
Seiten: 14 Band / Heft: 120 Artikelnummer: - Start- / Endseite: 165 - 178 Identifikator: ISSN: 1359-6640
CoNE: https://pure.mpg.de/cone/journals/resource/954925269326