Stabilizing platinum in phosphoric acid fuel cells. Final report, December 1980-March 1982
The cathode of the phosphoric acid fuel cell uses a high-surface-area platinum catalyst supported on a carbon substrate. During operation, the small platinum crystallites sinter, causing a loss in cell performance. The objective of this project was to investigate methods of stabilizing platinum in the high-surface-area condition by retarding or preventing the sintering process. During the course of this project, a process was developed that combines the catalytic oxidation methods of Blurton and Kunz with the carbon deposition techniques of Jalan. Using this combined process, air-cathodes were fabricated, which were stable for over 3000 hours of dynamic testing in fuel cells using 100% phosphoric acid at 191/sup 0/C. The performance of these cathodes remained virtually unchanged over the course of 3000 hours, and x-ray diffraction line broadening studies indicated only a slight change in crystallite size.
- Research Organization:
- National Aeronautics and Space Administration, Cleveland, OH (USA). Lewis Research Center; Institute of Gas Technology, Chicago, IL (USA)
- DOE Contract Number:
- AI01-80ET17088
- OSTI ID:
- 5328889
- Report Number(s):
- DOE/NASA/0208-4; NASA-CR-165606; ON: DE82019323
- Country of Publication:
- United States
- Language:
- English
Similar Records
Stabilizing platinum in phosphoric-acid fuel cells. Third quarterly report, July-September 1981
Stabilizing platinum in phosphoric acid fuel cells. Second quarterly report, April-June 1981
Related Subjects
300503* -- Fuel Cells-- Materials
Components
& Auxiliaries
ACID ELECTROLYTE FUEL CELLS
AIR
CARBON
CATALYST SUPPORTS
CATALYSTS
CATHODES
DIRECT ENERGY CONVERTERS
ELECTROCATALYSTS
ELECTROCHEMICAL CELLS
ELECTRODES
ELEMENTS
FABRICATION
FLUIDS
FUEL CELLS
GASES
HYDROGEN COMPOUNDS
INORGANIC ACIDS
METALS
NONMETALS
PARTICLE SIZE
PERFORMANCE TESTING
PHOSPHORIC ACID
PLATINUM
PLATINUM METALS
SINTERING
SIZE
STABILIZATION
TESTING
TRANSITION ELEMENTS