Metal crystallinity effects in electrocatalysis as probed by real-time FTIR spectroscopy: Electrooxidation of formic acid, methanol, and ethanol on ordered low-index platinum surfaces

Journal Article · Thu Jul 26 04:00:00 EDT 1990 · Journal of Physical Chemistry; (USA)

DOI:https://doi.org/10.1021/j100378a072· OSTI ID:6423796

Chang, Sichung; Leung, Lamwing H; Weaver, M J ^[1]

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

The electrooxidation kinetics of 0.05-0.25 M formic acid, methanol, and ethanol in 0.1 M HClO{sub 4} on ordered Pt(111), Pt(100), and Pt(110) surfaces were examined by means of FTIR spectra obtained during slow (2-10 mV s{sup {minus}1}) thin-layer potential sweeps. This procedure enables the potential-dependent CO coverage, {theta}{sub CO}, formed by dissociative reactant chemisorption to be followed in real time in relation to the appearance of CO{sub 2} and partial electrooxidation products as assayed quantitatively from their characteristic infrared bands. Terminally bonded (i.e., on-top) CO is the major form of this adsorbate detected under most conditions from the characteristic C-O stretching frequencies at ca. 2,030-2,060 cm{sup {minus}1}, although bridging CO was also observed in some cases. For formic acid electrooxidation, high CO coverages ({theta}{sub CO} {approx lt} 0.7) are formed on Pt(100) and Pt(110) that inhibit severely the reaction at low overpotentials during the positive-going sweep.

• OSTI ID: 6423796
• Journal Information: Journal of Physical Chemistry; (USA), Journal Name: Journal of Physical Chemistry; (USA) Vol. 94:15; ISSN 0022-3654; ISSN JPCHA
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400400* -- Electrochemistry
ALCOHOLS
CARBOXYLIC ACIDS
CATALYSTS
CHEMICAL REACTIONS
DATA
DATA ANALYSIS
ELECTROCATALYSTS
ELEMENTS
ETHANOL
EXPERIMENTAL DATA
FORMIC ACID
HYDROXY COMPOUNDS
INFORMATION
KINETICS
MEASURING INSTRUMENTS
MEASURING METHODS
METALS
METHANOL
MONOCARBOXYLIC ACIDS
NUMERICAL DATA
ORGANIC ACIDS
ORGANIC COMPOUNDS
OXIDATION
PLATINUM
PLATINUM METALS
REACTION KINETICS
TRANSITION ELEMENTS