Monte Carlo Simulation of the Solvent Contribution to the Potential of Mean Force for the Phenol Adsorption on Au(210) Electrodes

This paper reviews some recent canonical Monte Carlo simulations of the Au(210)/H 2O interface using a DFT force field developed by us. New results are reported on the solvent contribution to the potential of mean force (PMF) for the phenol adsorption, from a dilute aqueous solution, onto the Au(210) surface. The Monte Carlo simulations show the common features normally observed in the simulation of water in contact with metallic surfaces, where the water molecules adsorb forming bilayers. The molecules adsorbed over the Top gold sites form hydrogen bonds between the first and second solvent layers. The PMF calculations indicate that the phenol molecule penetrates the solvent layers with the aromatic ring in a perpendicular configuration and the oxygen atom pointing to the surface. The PMF results also suggest the existence of hydrogen bonds between the phenol molecule and the first solvent layer of the water molecules adsorbed onto the Top sites.