Abstract
Flatband potentials were determined for (112̅0) electrodes as a function of OH− and SH− concentrations. Surface coverage was calculated from the observed flatband potential shift. The Frumkin isotherm was applied to the data, and thermodynamic parameters were determined. The standard free energies of adsorption for OH− and S= were found to be −2.3 and −6.9 kcal/mol, respectively. At high SH− concentrations, there was evidence for a decrease in the repulsive interactions of the S= and OH− ions.
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