Non-linear phenomena in electrochemical systems

Abstract

Many electrochemical systems are known to exhibit complex non-linear behaviour such as spontaneous oscillations of current or potential, complex and chaotic oscillations and associated bifurcation scenarios and spatial pattern formation when maintained far from thermodynamic equilibrium. We discuss the origin of electrochemical oscillations and argue that most of the currently known electrochemical oscillators belong to one of two different classes. These classes are distinguished by the different types of electrical control under which oscillations are observable and are characterized by qualitatively different impedance spectra. The possibility of observing electrochemical oscillations under truly potentiostatic conditions is discussed briefly, as well as the role of global coupling, due to the electroneutrality condition in the formation of spatiotemporal patterns on the electrode surface.

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