In situ surface extended x-ray absorption fine structure spectroscopy of a lead monolayer at a silver(111) electrode/electrolyte interface

Journal Article · Wed Sep 30 00:00:00 EDT 1987 · J. Am. Chem. Soc.; (United States)

DOI:https://doi.org/10.1021/ja00254a013· OSTI ID:6085808

Samant, M G; Borges, G L; Gordon, II, J G; Melroy, O R; Blum, L

With use of fluorescence detection and grazing incidence excitation, the X-ray absorption spectrum was obtained, at the PbL/sub III/ edge, of a monoatomic adlayer of lead on a silver (111) electrode immersed in solution. The adlayer was produced by under potential deposition from aqueous lead acetate/sodium acetate electrolyte. The edge position and the near-edge structure confirm that the lead is fully reduced to the zerovalent state. The extended X-ray absorption fine structure (EXAFS) contains no detectable contribution from lead-silver scattering, either because the lead layer is incommensurate with the underlying silver lattice or because there is large thermal motion of the lead atoms. Instead, the fine structure is due to scattering from a single type of light atom, most likely oxygen. This oxygen must arise from adsorbed water molecules or acetate ions. The lead-oxygen distance changes with the electrode potential from 2.33 +/- 0.02 A at -0.53 V to 2.38 +/- 0.02 A at -1 V (vs. Ag/AgCl, 3 M KCl).

• Research Organization: IBM, San Jose, CA
• OSTI ID: 6085808
• Journal Information: J. Am. Chem. Soc.; (United States), Vol. 109:20
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
38 RADIATION CHEMISTRY, RADIOCHEMISTRY, AND NUCLEAR CHEMISTRY
LEAD
ABSORPTION SPECTROSCOPY
SILVER
SORPTIVE PROPERTIES
ELECTRODES
ELECTROLYTES
EXPERIMENTAL DATA
FINE STRUCTURE
INTERFACES
X RADIATION
DATA
ELECTROMAGNETIC RADIATION
ELEMENTS
INFORMATION
IONIZING RADIATIONS
METALS
NUMERICAL DATA
RADIATIONS
SPECTROSCOPY
SURFACE PROPERTIES
TRANSITION ELEMENTS
400400* - Electrochemistry
400600 - Radiation Chemistry