The electrochemical oxidation of methanol on single crystal surfaces of platinum
The electrochemical oxidation of methanol was studied on the low index planes of platinum-(100), (110), (111)-and on polycrystalline platinum in 0.1 M HClO{sub 4}. Presently, platinum is the most active electrocatalyst for this oxidation reaction and acid electrolytes are preferred because they are CO{sub 2} rejecting. Linear sweep cyclic voltammetry and LEED were used to verify that the flame annealed platinum single crystal surfaces used in this work were well ordered. A novel technique-the Hanging Meniscus Rotating Disk electrode (HMRD)-was used to differentiate voltammetric features arising from surface structure effects from those due to electrolytic impurities. The reactivity of these well-ordered surfaces for the oxidation of methanol, formaldehyde, formic acid, and carbon monoxide was studied by linear sweep cyclic voltammetry, potential step, and HMRD methods. The kinetics of each organic oxidation was dependent upon the crystallographic plane in contact with the solution. The effect of CO on the oxidation of methanol, formic acid, and formaldehyde was studied. CO was determined to be an intermediate in the oxidation of methanol by both electrochemical and spectroscopic methods. In situ FTIR studies also showed that the methanol oxidation reaction was dependent upon electrode surface structure. Linearly adsorbed CO was detected on all three low index surfaces and the frequency at which it appeared was dependent upon the crystal face. The production of CO{sub 2} via the oxidation of methanol was monitored via FTIR. The mechanistic implications of these findings were discussed.
- Research Organization:
- Case Western Reserve Univ., Cleveland, OH (USA)
- OSTI ID:
- 6338634
- Resource Relation:
- Other Information: Thesis (Ph.D)
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
10 SYNTHETIC FUELS
METHANOL
OXIDATION
PLATINUM
CATALYTIC EFFECTS
ADSORPTION
CARBON DIOXIDE
CARBON MONOXIDE
CHEMICAL BONDS
CHEMICAL REACTION KINETICS
CRYSTAL STRUCTURE
ELECTROCATALYSTS
ELECTRODES
ELECTRON DIFFRACTION
FORMALDEHYDE
FORMIC ACID
FOURIER TRANSFORMATION
FUEL CELLS
INFRARED SPECTRA
POLYCRYSTALS
REACTION INTERMEDIATES
SURFACE PROPERTIES
SYNTHESIS
VOLTAMETRY
ALCOHOLS
ALDEHYDES
CARBON COMPOUNDS
CARBON OXIDES
CARBOXYLIC ACIDS
CATALYSTS
CHALCOGENIDES
CHEMICAL REACTIONS
COHERENT SCATTERING
CRYSTALS
DIFFRACTION
DIRECT ENERGY CONVERTERS
ELECTROCHEMICAL CELLS
ELEMENTS
HYDROXY COMPOUNDS
INTEGRAL TRANSFORMATIONS
KINETICS
METALS
MONOCARBOXYLIC ACIDS
ORGANIC ACIDS
ORGANIC COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
PLATINUM METALS
REACTION KINETICS
SCATTERING
SORPTION
SPECTRA
TRANSFORMATIONS
TRANSITION ELEMENTS
300505* - Fuel Cells- Electrochemistry
Mass Transfer & Thermodynamics
100400 - Synthetic Fuels- Combustion- (1990-)