Geometrical Structure of Adlayers on Immersed Electrodes
Abstract
Lead and copper monolayers (produced by underpotential deposition) on silver (III) and gold (III) surfaces, respectively, have been characterized by x-ray absorption spectroscopy and x-ray diffraction. The experiments were performed in situ, with the electrode immersed in aqueous electrolyte, and at a controlled potential. A combination of grazing incidence excitation and fluorescence detection (for x-ray absorption) provided the required sensitivity and surface selectivity. The metal adlayers are fully reduced (zero valent). Lead forms a well ordered two dimensional solid with a close packed hexagonal structure. Its lattice is slightly compressed relative to bulk lead and is incommensurate with the underlying silver lattice. The copper EXAFS is consistent with a commensurate overlayer with the copper atoms in the three fold sites.
Document Details
- Document Type
- Technical Report
- Publication Date
- Nov 04, 1988
- Accession Number
- ADA202307
Entities
People
- Joseph G. Gordon Ii
- Lesser Blum
- Owen R. Melroy
Organizations
- University of Puerto Rico