Computational Lattice-Gas Modeling of the Electrosorption of Small Molecules and Ions

Details Computational Lattice-Gas Modeling of the Electrosorption of Small Molecules and Ions Computational Lattice-Gas Modeling of the Electrosorption of Small Molecules and Ions

1994-09-29

arxiv.org/abs/cond-mat/9409121v1

Surf. Sci. 335 (1995) 389

Physics

Condensed Matter

17 pp. uuencoded postscript, FSU-SCRI-94C-97

Scientific paper

10.1016/0039-6028(95)00440-8

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 involve the specific adsorption of small molecules or ions on well-characterized single-crystal electrodes, and they provide 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, signified in cyclic voltammograms by a sharp current peak. Based on data from {\it in situ\/} radiochemical surface concentration measurements, cyclic voltammetry, and scanning tunneling micro- scopy, and {\it 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 calcu- lations and numerical Monte Carlo simulations, and effective lattice-gas inter- action parameters were determined so as to provide agreement with experiments.

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