Underpotential deposition of Cu on Au(111) in sulfate-containing electrolytes: a theoretical and experimental study

We study the underpotential deposition of Cu on single‐crystal Au(111) electrodes in sulfate‐containing electrolytes by a combination of computational statistical‐mechanics based lattice‐gas modeling and experiments. The experimental methods are in situ cyclic voltammetry and coulometry and ex situ Auger electron spectroscopy and low‐energy electron diffraction. The experimentally obtained voltammetric current and charge densities and adsorbate coverages are compared with the predictions of a two‐component lattice‐gas model for the coadsorption of Cu and sulfate. This model includes effective, lateral interactions out to fourth‐nearest neighbors. Using group‐theoretical ground‐state calculations and Monte Carlo simulations, we estimate effective electrovalences and lateral adsorbate–adsorbate interactions so as to obtain overall agreement with experiments, including both our own and those of other groups. In agreement with earlier work, we find a mixed (√3×√3) phase consisting of 2/3 monolayer Cu and 1/3 ...

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