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          Institute: Fritz-Haber-Institut     Collection: Physical Chemistry     Display Documents

ID: 208316.0, Fritz-Haber-Institut / Physical Chemistry
Hydroxide adsorption on Ag(110) electrodes: An in situ second harmonic generation and ex situ electron diffraction study
Authors:Horswell, Sarah L.; Pinheiro, Alexei L. N.; Savinova, Elena R.; Pettinger, Bruno; Zei, Mau-Scheng; Ertl, Gerhard
Date of Publication (YYYY-MM-DD):2004-11-04
Title of Journal:Journal of Physical Chemistry B
Journal Abbrev.:J. Phys. Chem. B
Issue / Number:48
Start Page:18640
End Page:18649
Copyright:© 2004 American Chemical Society
Review Status:Peer-review
Audience:Experts Only
Abstract / Description:The adsorption of hydroxide on the Ag(110) surface has been studied with cyclic voltammetry, in situ second harmonic generation (SHG), and ex situ low energy electron diffraction (LEED) and reflection high energy electron diffraction (RHEED). OH- is found to be adsorbed on the Ag(110) surface at potentials negative of the potential of zero charge, forming small antiphase domains of c(2 x 6) symmetry. Further adsorption leads to longer-range order and the removal of antiphase domain boundaries and is associated with a current peak in the cyclic voltammogram (CV). Concurrently, a change in symmetry patterns is observed in SHG. A c(2 x 2) pattern gradually replaces the c(2 x 6) pattern as the potential, and the OH- coverage, is increased. At the beginning of the second current wave, another symmetry change takes place which is accompanied by a sharp change in the LEED pattern from a c(2 x 2) pattern to a (1 x 1) pattern with strong background, indicating a disordered adlayer. However, RHEED results show that some patches of c(2 x 2) structure remain on the surface. The correlation between SHG and diffraction measurements and comparison of the information obtained from each technique allow us to develop a detailed picture of the structures and electronic effects at the Ag(110) alkaline electrolyte interface.
Free Keywords:silver; Ag; hydroxide; Second Harmonic Generation; SHG; LEED; RHEED; adsorption; electrochemistry
External Publication Status:published
Document Type:Article
Communicated by:Gerhard Ertl
Affiliations:Fritz-Haber-Institut/Physical Chemistry
External Affiliations:Savinova ER, Technische Universitaet Muenchen, Physik-Department E19, James-Franck Str. 1, D-85748 Garching, Germany. Permanent address: Boreskov Institute of Catalysis of the Siberian Branch of the Russian Academy of Sciences, Prospekt Akademika Lavrentieva, 5, Novosibirsk 630090, Russian Federation; Zei MS, Present address: Department of Physics, National Central University, Jungli, Taiwan 32054.
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