Oscillatory behavior in the electrochemical oxidation of formic acid on Pt(100)

Journal Article · Thu Sep 23 04:00:00 EDT 1993 · Journal of Physical Chemistry; (United States)

DOI:https://doi.org/10.1021/j100140a039· OSTI ID:5651667

Markovic, N; Ross, Jr, P N ^[1]

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1. 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), Journal Name: Journal of Physical Chemistry; (United States) Vol. 97:38; ISSN JPCHAX; ISSN 0022-3654
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
400400 -- Electrochemistry
CARBOXYLIC ACIDS
CATALYSTS
CHEMICAL REACTIONS
CHEMISTRY
CRYSTALS
CURRENTS
ELECTRIC CURRENTS
ELECTROCHEMISTRY
ELECTRODES
ELECTROLYTES
ELEMENTS
FORMIC ACID
METALS
MONOCARBOXYLIC ACIDS
MONOCRYSTALS
ORGANIC ACIDS
ORGANIC COMPOUNDS
OSCILLATIONS
OXIDATION
PLATINUM
PLATINUM METALS
SURFACE PROPERTIES
TRANSITION ELEMENTS