Abstract
We discuss some applications of simple lattice-gas models to electrochemical adsorption. Different values of the model interactions can cause either poisoning behavior or enhanced adsorption to be observed. It is described how these behaviors are closely related to the topologies of the adsorbate phase diagrams. Applications to the poisoning by S of H on Pt(111), and, as an example of enhanced adsorption, the electrosorption of naphthalene on Cu, are considered. Finally, recent voltammetric data are presented for the adsorption of urea on monocrystalline Pt(100). We propose that the observed behavior is the result of a first-order phase transition in a sub-monolayer of adsorbed urea and hydrogen, and we present a lattice-gas model based on this idea.
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