  We discuss applications of statistical-mechanical lattice-gas models to study
static and dynamic aspects of electrochemical adsorption. The strategy
developed to describe specific systems includes microscopic model formulation,
calculation of zero-temperature phase diagrams, numerical simulation of
thermodynamic and structural quantities at nonzero temperatures, and estimation
of effective, lateral interactions. We briefly review earlier work, including
studies by Monte Carlo simulation of the adsorption of urea on Pt(100). As an
illustrative example, we discuss in some detail recent applications to the
underpotential deposition of Cu with sulfate on Au(111). Experimental and
numerical results are included for equilibrium coverages and voltammetric
currents at slow potential sweep rates, and new results from dynamic Monte
Carlo simulations are presented. In particular, we present simulated results
for current transients far from equilibrium, following sudden changes in the
electrode potential.
