Computational lattice-gas modeling of the electrosorption of small molecules and ions

P. A. Rikvold, M. Gamboa-Aldeco, J. Zhang, M. Han, Q. Wang, H. L. Richards, A. Wieckowski

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45 Scopus citations


We present two recent applications of lattice-gas modeling techniques to electrochemical adsorption on catalytically active metal substrates: urea on Pt(100) and (bi)sulfate on Rh(111). Both systems involve the specific adsorption of small molecules or ions on single-crystal electrodes, and they are characterized by a particularly good fit between the adsorbate geometry and the substrate structure. The close geometric fit facilitates the formation of ordered submonolayer adsorbate phases in a range of electrode potential positive of the range in which an adsorbed monolayer of hydrogen is stable. In both systems the ordered-phase region is separated from the adsorbed-hydrogen region by a phase transition, signalled in cyclic voltammograms by a sharp current peak. Based on data from in situ radiochemical surface concentration measurements, cyclic voltammetry, and scanning tunneling microscopy, and ex situ Auger electron spectroscopy and low-energy electron diffraction, we have developed specific lattice-gas models for the two systems. These models were studied by group-theoretical ground-state calculations and numerical Monte Carlo simulations, and effective lattice-gas interaction parameters were determined so as to provide agreement with the experimental results.

Original languageEnglish
Pages (from-to)389-400
Number of pages12
JournalSurface Science
Issue numberC
StatePublished - 20 Jul 1995


  • Chemisorption
  • Computer simulations
  • Construction and use of effective interatomic interactions
  • Electrochemical methods
  • Equilibrium thermodynamics and statistical mechanics
  • Low index single crystal surfaces
  • Solid-liquid interfaces
  • Surface thermodynamics


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