Comparisons between coverage-dependent infrared frequencies for carbon monoxide adsorbed on ordered Pt(111), Pt(100), and Pt(110) in electrochemical and ultrahigh-vacuum environments

Journal Article · Thu Jul 13 04:00:00 EDT 1989 · Journal of Physical Chemistry; (USA)

DOI:https://doi.org/10.1021/j100351a006· OSTI ID:7072254

Chang, Sichung; Leung, L W.H.; Weaver, M J ^[1]

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1. Purdue Univ., West Lafayette, IN (USA)

Infrared spectra measured for carbon monoxide adsorbed on Pt(111), (100) and (110) surfaces in aqueous 0.1 M HClO{sub 4} as a function of CO coverage, {theta}{sub CO}, and electrode potential, E, are compared with coverage-dependent infrared spectra for the corresponding interfaces in ultrahigh vacuum (uhv). The electrochemical {theta}{sub CO} values at saturation on all three faces are similar to those in uhv. The terminal C-O stretching frequencies, {nu}{sub CO}, and band intensities are markedly dependent on the crystallographic orientation at a given electrode potential. Extrapolation of the electrochemical coverage-dependent {nu}{sub CO} values to electrode potentials corresponding to the appropriate work function for the anhydrous uhv Pt/CO surfaces yields similar {nu}{sub CO}-{theta}{sub CO} plots as are observed for the latter interfaces. This suggests that the well-known effects of the double-layer solvating environment upon {nu}{sub CO} are primarily electrostatic in origin.

• OSTI ID: 7072254
• Journal Information: Journal of Physical Chemistry; (USA), Journal Name: Journal of Physical Chemistry; (USA) Vol. 93:14; ISSN 0022-3654; ISSN JPCHA
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400000* -- Chemistry
400400 -- Electrochemistry
CARBON COMPOUNDS
CARBON MONOXIDE
CARBON OXIDES
CHALCOGENIDES
CHEMISTRY
DATA
DATA ANALYSIS
ELECTROCHEMISTRY
ELEMENTS
EXPERIMENTAL DATA
INFORMATION
INFRARED SPECTRA
MEASURING INSTRUMENTS
MEASURING METHODS
METALS
NUMERICAL DATA
OXIDES
OXYGEN COMPOUNDS
PLATINUM
PLATINUM METALS
SPECTRA
SURFACE PROPERTIES
TRANSITION ELEMENTS
ULTRAHIGH VACUUM