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Adsorption of acetic acid at platinum and gold electrodes: a combined infrared spectroscopic and radiotracer study

Journal Article · · J. Phys. Chem.; (United States)
DOI:https://doi.org/10.1021/j100317a044· OSTI ID:5217995
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The potential-dependent specific adsorption of acetic acid and acetate at polycrystalline platinum- and gold-aqueous interfaces has been examined by potential-difference infrared spectroscopy (PDIRS) in conjunction with quantitative surface concentration measurements using the radiotracer technique. Both the infrared and radiotracer measurements utilize a similar thin-layer solution arrangement. Extensive adsorption of acetic acid occurs at both platinum and gold, which increases at more positive potentials and reaches a maximum at the onset of anodic oxide formation. The PDIR spectra contain several features identified with solution acetic acid in the 1200-1800-cm/sup -1/ region, including v/sub C==O/ and v/sub C-O/ bands at 1710 and 1280 cm/sup -1/, respectively, arising from adsorption-induced changes in the thin-layer solution composition as well as a single band, at 1415 and 1400 cm/sup -1/ on platinum and gold, restively, due to adsorbed acetic acid. The intensity of the former bands can by employed to evaluate the extent of adsorption as a function of potential; the results are in semiquantitative agreement with the surface concentration-potential data from radiotracer measurements. In view of the infrared spectra together with the observed absence of acetate adsorption, the most likely modes of acetic acid adsorption involve hydrogen bonding between the carbonyl oxygen and inner-layer water molecules, of by self-association to form dimers or chain structures
Research Organization:
Purdue Univ., West Lafayette, IN (USA)
OSTI ID:
5217995
Journal Information:
J. Phys. Chem.; (United States), Journal Name: J. Phys. Chem.; (United States) Vol. 92:6; ISSN JPCHA
Country of Publication:
United States
Language:
English

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Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
ABSORPTION SPECTROSCOPY
ACETIC ACID
ADSORPTION
BETA DECAY RADIOISOTOPES
BETA-MINUS DECAY RADIOISOTOPES
CARBON 14
CARBON ISOTOPES
CARBOXYLIC ACIDS
DATA
DISTRIBUTION
ELECTRODES
ELEMENTS
EVEN-EVEN NUCLEI
EXPERIMENTAL DATA
GOLD
HYDROGEN COMPOUNDS
INFORMATION
INFRARED SPECTRA
INORGANIC ACIDS
ISOTOPE APPLICATIONS
ISOTOPES
LABELLING
LIGHT NUCLEI
METALS
MONOCARBOXYLIC ACIDS
NUCLEI
NUMERICAL DATA
ORGANIC ACIDS
ORGANIC COMPOUNDS
PERCHLORIC ACID
PLATINUM
PLATINUM METALS
QUANTITY RATIO
RADIOISOTOPES
SORPTION
SORPTIVE PROPERTIES
SPATIAL DISTRIBUTION
SPECTRA
SPECTROSCOPY
SURFACE PROPERTIES
TRACER TECHNIQUES
TRANSITION ELEMENTS
VOLTAMETRY
YEARS LIVING RADIOISOTOPES