Influence of Adsorbed Hydroxyl and Carbon Monoxide on Potential-Induced Reconstruction of Au(100) as Examined by Scanning Tunneling Microscopy.

摘要

The potential-dependent hexagonal ( hex ) reconstruction of ordered Au(100) in an alkaline electrolyte, 0.1 M KOH, has been examined by means of in-situ scanning tunneling microscopy. In harmony with recent X-ray diffraction results, the hex (1 x 1) transition occurs at lower potentials, ca 0 V vs SCE, than in weakly adsorbing acidic media such as perchloric acid, consistent with an influence of hydroxide adsorption. The dynamics of the reverse (1 x 1) hex transition accelerate markedly as the potential is lowered below ca -0. 35 V vs SCE. Carbon monoxide adsorption, induced in 0.1 M KOH at negative potentials, facilitates the formation of a notably homogeneous hex phase.