Abstract
The kinetic Ising model is introduced, and its scope for modelling time-dependent phenomena at the electrochemical interface is outlined. The master equation and its reduced forms are presented for the so-called single spin-flip and spin-exchange processes which provide a molecular description of adsorption—desorption kinetics and transport phenomena (cf. redox hopping in modified electrodes). We apply this formalism to adsorption—desorption kinetics and show how Langmuir and Frumkin-type kinetic equations arise naturally from it. A novel dependence of the desorption rate on the solution activity of the desad species is predicted in general which is contrary to normal phenomenological intuition. A possible reformulation of the Butler—Volmer equation within a kinetic Ising model framework is also discussed.
Published Version
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