Structure of Tl Adlayers on the Pt(111) Electrode Surface: Effects of Solution pH and Bisulfate Coadsorption

Autor:	Jia X. Wang, R. R. Adzic, B. M. Ocko, Olaf M. Magnussen
Rok vydání:	1996
Předmět:	General Engineering Hexagonal phase Tantalum Analytical chemistry chemistry.chemical_element Sulfuric acid Electrolyte Crystallography chemistry.chemical_compound chemistry Phase (matter) Monolayer X-ray crystallography Physical and Theoretical Chemistry Platinum
Zdroj:	The Journal of Physical Chemistry. 100:14721-14725
ISSN:	1541-5740 0022-3654
DOI:	10.1021/jp960030h
Popis:	The structure of Tl adlayers deposited at underpotentials on Pt(111) has been investigated in four different electrolyte solutions (HClO4, NaClO4, NaOH, and H2SO4) 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 ( × )R30° phase with a Tl coverage of 1/3 monolayer is formed in coadsorption with bisulfates over a 0.22 V wide potential range.
Databáze:	OpenAIRE
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