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Title: Structure of Tl adlayers on the Pt(111) electrode surface: Effects of solution pH and bisulfate coadsorption

Abstract

The structure of Tl adlayers deposited at underpotentials on Pt(111) has been investigated in four different electrolyte solutions (HClO{sub 4}, NaClO{sub 4}, NaOH, and H{sub 2}SO{sub 4}) with surface X-ray scattering (SXS) techniques. In all solutions investigated, Tl forms an incommensurate, aligned-hexagonal phase at the most negative potentials prior to its bulk deposition or hydrogen evolution. With decreasing potential the monolayer compresses and thus the Tl coverage increases. Under hydrogen evolution, the close-packed hexagonal Tl monolayer also exists and this reaction causes a slight lowering of the Tl coverage and a significant decrease of the in-plane ordering of the monolayer. In sulfuric acid solution, besides the close-packed hexagonal phase, a commensurate ({radical}3 x {radical}3)R30{degree} phase with a Tl coverage of 1/3 monolayer is formed in coadsorption with bisulfates over a 0.22 V wide potential range. 21 refs., 8 figs.

Authors:
; ; ;  [1]
  1. Brookhaven National Lab., Upton, NY (United States)
Publication Date:
Research Org.:
Brookhaven National Laboratory (BNL), Upton, NY
OSTI Identifier:
380770
DOE Contract Number:  
AC02-76CH00016
Resource Type:
Journal Article
Journal Name:
Journal of Physical Chemistry
Additional Journal Information:
Journal Volume: 100; Journal Issue: 35; Other Information: PBD: 29 Aug 1996
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 40 CHEMISTRY; TANTALUM; ADSORPTION; ELECTRODEPOSITION; FILMS; X-RAY DIFFRACTION; ACID SULFATES; PLATINUM; ELECTRODES; SURFACES; PH VALUE; VOLTAMETRY

Citation Formats

Adzic, R R, Wang, J X, Magnussen, O M, and Ocko, B M. Structure of Tl adlayers on the Pt(111) electrode surface: Effects of solution pH and bisulfate coadsorption. United States: N. p., 1996. Web. doi:10.1021/jp960030h.
Adzic, R R, Wang, J X, Magnussen, O M, & Ocko, B M. Structure of Tl adlayers on the Pt(111) electrode surface: Effects of solution pH and bisulfate coadsorption. United States. doi:10.1021/jp960030h.
Adzic, R R, Wang, J X, Magnussen, O M, and Ocko, B M. Thu . "Structure of Tl adlayers on the Pt(111) electrode surface: Effects of solution pH and bisulfate coadsorption". United States. doi:10.1021/jp960030h.
@article{osti_380770,
title = {Structure of Tl adlayers on the Pt(111) electrode surface: Effects of solution pH and bisulfate coadsorption},
author = {Adzic, R R and Wang, J X and Magnussen, O M and Ocko, B M},
abstractNote = {The structure of Tl adlayers deposited at underpotentials on Pt(111) has been investigated in four different electrolyte solutions (HClO{sub 4}, NaClO{sub 4}, NaOH, and H{sub 2}SO{sub 4}) with surface X-ray scattering (SXS) techniques. In all solutions investigated, Tl forms an incommensurate, aligned-hexagonal phase at the most negative potentials prior to its bulk deposition or hydrogen evolution. With decreasing potential the monolayer compresses and thus the Tl coverage increases. Under hydrogen evolution, the close-packed hexagonal Tl monolayer also exists and this reaction causes a slight lowering of the Tl coverage and a significant decrease of the in-plane ordering of the monolayer. In sulfuric acid solution, besides the close-packed hexagonal phase, a commensurate ({radical}3 x {radical}3)R30{degree} phase with a Tl coverage of 1/3 monolayer is formed in coadsorption with bisulfates over a 0.22 V wide potential range. 21 refs., 8 figs.},
doi = {10.1021/jp960030h},
journal = {Journal of Physical Chemistry},
number = 35,
volume = 100,
place = {United States},
year = {1996},
month = {8}
}