Influence of Adsorbed Hydroxyl and Carbon Monoxide on Potential-Induced Reconstruction of Au(100) as Examined by Scanning Tunneling Microscopy
PURDUE UNIV LAFAYETTE IN DEPT OF CHEMISTRY
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The potential-dependent hexagonal hex reconstruction of ordered Au100 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.
- Inorganic Chemistry
- Physical Chemistry
- Atomic and Molecular Physics and Spectroscopy