In situ infrared spectroscopy of CO adsorbed at ordered Pt(100)-aqueous interfaces : double-layer effects upon the adsorbate binding geometry

Surface infrared spectra for carbon monoxide adsorbed on ordered Pt(100) in 0.1 M HClO{sub 4} are reported as a function of CO coverage, 0.1 {approx lt} {theta} {approx lt} 0.85, and electrode potential, {minus}0.25 V {le} E {approx lt} 0.25 V vs SCE. Vibrational C-O stretching bands, {nu}{sub co},...

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Bibliographic Details
Published inJournal of physical chemistry (1952) Vol. 94; no. 12; pp. 5095 - 5102
Main Authors SI-CHUNG CHANG, WEAVER, M. J
Format Journal Article
LanguageEnglish
Published Washington, DC American Chemical Society 14.06.1990
Subjects
400201 - Chemical & Physicochemical Properties
ADSORPTION
CARBON COMPOUNDS
CARBON MONOXIDE
CARBON OXIDES
CATALYSTS
CHALCOGENIDES
Chemistry
DATA
DATA ANALYSIS
ELEMENTS
Exact sciences and technology
EXPERIMENTAL DATA
General and physical chemistry
INFORMATION
INFRARED SPECTRA
INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY
MEASURING INSTRUMENTS
MEASURING METHODS
METALS
NUMERICAL DATA
OXIDES
OXYGEN COMPOUNDS
PLATINUM
PLATINUM METALS
Solid-gas interface
SORPTION
SPECTRA
Surface physical chemistry
SURFACE PROPERTIES
TRANSITION ELEMENTS
Inorganic adsorbate
Infrared spectrometry
Gas solid adsorption
Vibrational analysis
Platinum
Gas solid interface
Metallic adsorbent
Crystal face
Carbon monoxide
Experimental study
Platinoid
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Summary:Surface infrared spectra for carbon monoxide adsorbed on ordered Pt(100) in 0.1 M HClO{sub 4} are reported as a function of CO coverage, 0.1 {approx lt} {theta} {approx lt} 0.85, and electrode potential, {minus}0.25 V {le} E {approx lt} 0.25 V vs SCE. Vibrational C-O stretching bands, {nu}{sub co}, corresponding to both terminal and 2-fold bridging geometries are observed, with intensities that depend markedly upon E and {theta}. For coverages formed by dosing with dilute (ca. 2 {times} 10{sup {minus}5} M) CO solutions for varying times ({approx lt}15 min), alterations in {theta} at positive potentials (E {approx gt} 0.1 V) yield dramatic changes in the site occupancy in that bridging and terminal features are dominant for {theta} {approx lt} 0.3 and {theta} {approx gt} 0.7, respectively. Qualitatively similar, yet less marked, {theta}-induced alterations in the CO binding geometry are observed at negative potentials (E < 0 V vs SCE), where hydrogen rather than water constitutes the major coadsorbate.
ISSN:0022-3654
1541-5740
DOI:10.1021/j100375a062