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Title: In-situ X-ray diffraction and STM studies of bromide adsorption on Au(111) electrodes

Abstract

The structure of bromide adlayers at the Au(111)-aqueous solution interface has been studied by in-situ surface X-ray scattering (SXS) and scanning tunneling microscopy (STM). Both techniques show the existence of a hexagonal close-packed adlayer phase above a critical potential and are in good quantitative agreement on the adlayer structural parameters. The bromide-bromide spacing changes continuously between 4.24 A at the critical potential and 4.03 A at a potential 300 mV more positive. The adlayer is rotated relative to the substrate by an angle dependent on potential and bromide concentration. The potential- dependent adlayer density corresponding to these structural results agrees well with Br surface excess densities from published electrochemical measurements. At very positive potentials a bromide-induced step-flow etching of the Au substrate is observed. The results are used to compare the different techniques and to discuss the adlayer structure, the phase behavior, and the halide-gold chemical interaction. 49 refs., 8 figs.

Authors:
; ; ;  [1]
  1. Brookhaven National Lab., Upton, NY (United States)
Publication Date:
Research Org.:
Brookhaven National Lab. (BNL), Upton, NY (United States)
OSTI Identifier:
226685
DOE Contract Number:  
AC02-76CH00016
Resource Type:
Journal Article
Journal Name:
Journal of Physical Chemistry
Additional Journal Information:
Journal Volume: 100; Journal Issue: 13; Other Information: PBD: 28 Mar 1996
Country of Publication:
United States
Language:
English
Subject:
40 CHEMISTRY; 36 MATERIALS SCIENCE; BROMIDES; ADSORPTION; FILMS; X-RAY DIFFRACTION; MICROSCOPY; STRUCTURAL CHEMICAL ANALYSIS; GOLD; ELECTRODES; ELECTRIC POTENTIAL; AQUEOUS SOLUTIONS; INTERFACES

Citation Formats

Magnussen, O M, Ocko, B M, Wang, J X, and Adzic, R R. In-situ X-ray diffraction and STM studies of bromide adsorption on Au(111) electrodes. United States: N. p., 1996. Web. doi:10.1021/jp953281j.
Magnussen, O M, Ocko, B M, Wang, J X, & Adzic, R R. In-situ X-ray diffraction and STM studies of bromide adsorption on Au(111) electrodes. United States. https://doi.org/10.1021/jp953281j
Magnussen, O M, Ocko, B M, Wang, J X, and Adzic, R R. 1996. "In-situ X-ray diffraction and STM studies of bromide adsorption on Au(111) electrodes". United States. https://doi.org/10.1021/jp953281j.
@article{osti_226685,
title = {In-situ X-ray diffraction and STM studies of bromide adsorption on Au(111) electrodes},
author = {Magnussen, O M and Ocko, B M and Wang, J X and Adzic, R R},
abstractNote = {The structure of bromide adlayers at the Au(111)-aqueous solution interface has been studied by in-situ surface X-ray scattering (SXS) and scanning tunneling microscopy (STM). Both techniques show the existence of a hexagonal close-packed adlayer phase above a critical potential and are in good quantitative agreement on the adlayer structural parameters. The bromide-bromide spacing changes continuously between 4.24 A at the critical potential and 4.03 A at a potential 300 mV more positive. The adlayer is rotated relative to the substrate by an angle dependent on potential and bromide concentration. The potential- dependent adlayer density corresponding to these structural results agrees well with Br surface excess densities from published electrochemical measurements. At very positive potentials a bromide-induced step-flow etching of the Au substrate is observed. The results are used to compare the different techniques and to discuss the adlayer structure, the phase behavior, and the halide-gold chemical interaction. 49 refs., 8 figs.},
doi = {10.1021/jp953281j},
url = {https://www.osti.gov/biblio/226685}, journal = {Journal of Physical Chemistry},
number = 13,
volume = 100,
place = {United States},
year = {Thu Mar 28 00:00:00 EST 1996},
month = {Thu Mar 28 00:00:00 EST 1996}
}