Adsorption Behavior of n-Hexanol on Ag(lll) from Aqueous 0.05 M KCIO4

A computerized chronocoulometric technique was employed to investigate the adsorption behavior of n-hexanol (NHEX) on the (111) face of a silver single crystal from aqueous 0.05 M KCIO4. The charge density, σM, as a function of the applied potential, E, and of the NHEX concentration was analyzed thermodynamically, yielding the Gibbs surface excess and the standard Gibbs energy of adsorption, ΔG°ads, of NHEX as a function of E and σM- A comparison of the experimental adsorption parameters with a molecular model points to a flat orientation of the adsorbed NHEX molecules. The low value of -ΔG°ads at the potential of maximum adsorption, 18.4 kJ mol-1, is indicative of the strongly hydrophilicity of silver. © 1995, American Chemical Society. All rights reserved.