Adsorbate-Induced Surface Stress of Chloride Monolayer on Au(111) Electrode

Abstract

The statistical thermodynamic theory of adsorbate-induced surface stress of anion adsorption monolayer on Au(111) has been established by using the lattice gas model and considering various components of the adsorbate−adsorbate interaction energies in the adlayer, such as the substrate-mediated interaction, the electrostatic energies, Lennard-Jones potential, and so on. The adsorbate-induced surface stress, its components due to various intermolecule forces, and the area elasticity modulus in chloride adions at the Au(111) electrode surface have been calculated. The calculated surface stress of chloride adions on Au(111) approximates the experiment results and the difference between the surface stress and the surface tension is the same order of magnitude as that of the surface stress. Among various components of the adsorbate−adsorbate interaction energies in the adlayer, the substrate-mediated interaction is significant for the adsorbate-induced surface stress, which shows that the indirect contribution...