Rotating disk electrode apparatus for the study of fuel cell reactions at elevated temperatures and pressures
A rotating disk electrode apparatus for studying fuel cell reactions at elevated temperatures and pressures was described. Preliminary data for oxygen reduction in 89.5 percent H3PO4 at temperatures up to 205 C and pressures up to 7.6 A were provided. The Tafel slope was approximately 120 mV/decade and invariant with temperature up to 175 C and pressures near atmospheric. Increasing the pressure to 3 A at 175 C caused the Tafel slope to decrease to a value of approximately RT/F. Above 3 A, the current was proportional to the oxygen pressure. A first order dependence with respect to oxygen pressure was suggested, as well as a mechanism change with increasing oxygen coverage of the platinum. 10 references.
- Research Organization:
- Brookhaven National Lab., Upton, NY
- DOE Contract Number:
- AC02-76CH00016
- OSTI ID:
- 6424341
- Journal Information:
- J. Electrochem. Soc.; (United States), Journal Name: J. Electrochem. Soc.; (United States) Vol. 131; ISSN JESOA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
300505* -- Fuel Cells-- Electrochemistry
Mass Transfer & Thermodynamics
CATALYSTS
CHEMICAL REACTION KINETICS
DIRECT ENERGY CONVERTERS
ELECTROCATALYSTS
ELECTROCHEMICAL CELLS
ELECTRODES
ELEMENTS
FUEL CELLS
HIGH PRESSURE
KINETICS
METALS
PLATINUM
PLATINUM METALS
REACTION KINETICS
TRANSITION ELEMENTS