Stabilizing platinum in phosphoric acid fuel cells. Second quarterly report, April-June 1981
The objective of this project is to develop a carbon substrate for use in fabricating phosphoric acid fuel cell electrodes which will stabilize the platinum catalyst in a high-surface-area condition by retarding the sintering of small platinum crystallites. The experimental approach is to form etch pits in the carbon by oxidizing the carbon in the presence of a metal oxide catalyst, remove the metal oxide by an acid wash, and then deposit platinum in these pits. The experimental results from the first quarter of the project confirm the formation of etch pits. During the second quarter, both unmodified and catayticaly oxidized supports were impregnated with high-surface-area platinum (40 to 100 m/sup 2//g) and fabricated into flag-type test electrodes. The platinum sintering rates were determined for these electrodes under conditions simulating those encountered at the cathode of a phosphoric acid fuel cell (650 mV RHE, 100% H/sub 3/PO/sub 4/, 190/sup 0/C). In general, the platinum sintering rates were lower for supports modified by catalytic oxidation.
- Research Organization:
- National Aeronautics and Space Administration, Washington, DC (USA); Institute of Gas Technology, Chicago, IL (USA)
- DOE Contract Number:
- AI01-80ET17088
- OSTI ID:
- 6328306
- Report Number(s):
- DOE/NASA/0208-2; NASA-CR-165377; ON: DE81027844
- Country of Publication:
- United States
- Language:
- English
Similar Records
Stabilizing platinum in phosphoric acid fuel cells. First quarterly report for 1981, December 1980-March 1981
Stabilizing platinum in phosphoric acid fuel cells. Final report, December 1980-March 1982
Related Subjects
300503* -- Fuel Cells-- Materials
Components
& Auxiliaries
36 MATERIALS SCIENCE
360101 -- Metals & Alloys-- Preparation & Fabrication
ACID ELECTROLYTE FUEL CELLS
CARBON
CATALYST SUPPORTS
CATALYSTS
DIRECT ENERGY CONVERTERS
ELECTROCATALYSTS
ELECTROCHEMICAL CELLS
ELEMENTS
ETCHING
FABRICATION
FUEL CELLS
HYDROGEN COMPOUNDS
IMPREGNATION
INORGANIC ACIDS
METALS
NONMETALS
PHOSPHORIC ACID
PLATINUM
PLATINUM METALS
SINTERING
STABILIZATION
SURFACE FINISHING
TESTING
TRANSITION ELEMENTS