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Author Humbert, Christophe ♦ Busson, Bertrand ♦ Tadjeddine, Abderrahmane
Source Hyper Articles en Ligne (HAL)
Content type Text
Publisher American Chemical Society
File Format PDF
Language English
Subject Keyword chim ♦ phys ♦ Chemical Sciences/Theoretical and/or physical chemistry ♦ Physics [physics]/Physics [physics]/Chemical Physics [physics.chem-ph] ♦ Physics [physics]/Physics [physics]/Optics [physics.optics]
Abstract We establish a new procedure to study the steady state adsorption of carbon monoxide (CO) at the surface of platinum under electrochemical control over a wide potential range in aqueous acidic solution. Using highly concentrated solutions of CO in perchloric acid medium enables the formation of a tightly packed and very stable CO monolayer at the surface of the metal, which allows cyclic voltammetry in the [−1200;+1500 mV] potential range (vs Ag/AgCl). We use sum-frequency generation (SFG) spectroscopy to show the unusual stability of the monolayer: going toward negative potentials, hydrogen evolution is first blocked then strongly quenched; toward positive potentials, CO oxidation is prevented as a consequence of its dense packing as a "frozen" monolayer. Diluting CO concentration by a factor of 10 is enough to recover most of the usual properties of the CO/Pt(110) interface, still maintaining the high stability of the CO adlayer. Such a protocol can be applied to any problem for which a CO poisoning mechanism has to be scrutinized or as a model of very stable electrochemical interfaces for fundamental studies.
ISSN 19327447
Educational Use Research
Learning Resource Type Article
Publisher Date 2016-01-01
e-ISSN 19327455
Journal Journal of Physical Chemistry C
Volume Number 120
Issue Number 29
Page Count 10
Starting Page 16211
Ending Page 16220