Oscillatory behavior in the electrochemical oxidation of formic acid on Pt(100)
- Lawrence Berkeley Lab., CA (United States)
The electrochemical oxidation of formic acid on Pt was studied in acidic supporting electrolyte using single-crystal electrodes. Very well-defined periodic (not chaotic) current oscillations on a stationary Pt(100) electrode were observed under both potentiodynamic and potentiostatic conditions. The oscillatory behavior is strongly dependent on the Pt surface structure and is seen on the (100) surface but not on the (111) surface. The periodicity, the amplitude, and the absolute magnitude of the current oscillations depends on at least three variables, electrode potential and potential history, formic acid concentration, and the anion of the supporting electrolyte. The pH of the electrolyte was not found to be an important variable, nor was mass transport, e.g. rotation or stirring. The behavior is extremely complex and difficult to analyze in terms of known electrode processes. 33 refs., 11 figs.
- DOE Contract Number:
- AC03-76SF00098
- OSTI ID:
- 5651667
- Journal Information:
- Journal of Physical Chemistry; (United States), Vol. 97:38; ISSN 0022-3654
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
FORMIC ACID
OXIDATION
PLATINUM
SURFACE PROPERTIES
CATALYSTS
ELECTRIC CURRENTS
ELECTROCHEMISTRY
ELECTRODES
ELECTROLYTES
MONOCRYSTALS
OSCILLATIONS
CARBOXYLIC ACIDS
CHEMICAL REACTIONS
CHEMISTRY
CRYSTALS
CURRENTS
ELEMENTS
METALS
MONOCARBOXYLIC ACIDS
ORGANIC ACIDS
ORGANIC COMPOUNDS
PLATINUM METALS
TRANSITION ELEMENTS
400201* - Chemical & Physicochemical Properties
400400 - Electrochemistry