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Mass transport processes at porous electrocatalysts in the electrogenerative reactor

Journal Article · · J. Electrochem. Soc.; (United States)
DOI:https://doi.org/10.1149/1.2133108· OSTI ID:5073152
;
Mass transport limitations were investigated in the electrolyte, gas phase, and in the pores of platinum and palladium black porous electrocatalysts using the electrogenerative reactor. Limiting currents were identical for both catalysts, depending on a power of the bulk reactant concentration, i/sub L/ = K/sub J/C/sub J/sub infinity//sup ..nu..J//, where C/sub J/J/sub infinity// can be the electrolyte concentration of hydrogen ions or of dissolved ethylene. Mathematical modeling and comparison with the experimental equation provided information regarding limiting processes. In a matrix cell diffusion limited ionic transport at the ethylene cathode. In free electrolytes, free convection can assist mass transport and improve limiting currents. Gas phase limiting current densities were examined in terms of a model involving limiting radial diffusion of dissolved ethylene with a concentration-dependent surface area and pore utilization. 42 references.
Research Organization:
Univ. of Wisconsin, Madison
OSTI ID:
5073152
Journal Information:
J. Electrochem. Soc.; (United States), Journal Name: J. Electrochem. Soc.; (United States) Vol. 124:10; ISSN JESOA
Country of Publication:
United States
Language:
English

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Related Subjects

30 DIRECT ENERGY CONVERSION
300500* -- Fuel Cells
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400400 -- Electrochemistry
ALKENES
CATALYSTS
CHEMICAL REACTIONS
CHEMISTRY
CURRENT DENSITY
CURRENTS
DIFFUSION
DIRECT ENERGY CONVERTERS
ELECTRIC CURRENTS
ELECTROCHEMICAL CELLS
ELECTROCHEMISTRY
ELECTRODES
ELEMENTS
ETHYLENE
FUEL CELLS
HYDROCARBONS
HYDROGENATION
LIMITING VALUES
MASS TRANSFER
MATERIALS
MATHEMATICAL MODELS
METALS
ORGANIC COMPOUNDS
PALLADIUM
PLATINUM
PLATINUM METALS
POROSITY
POROUS MATERIALS
TRANSITION ELEMENTS