Cathode catalyst for primary phosphoric acid fuel cells. Fifth quarterly report, July-September 1980
Technical Report
·
OSTI ID:6729428
Alkylation of Vulcan XC-72 has been shown to provide the most stable bond type for linking CoTAA to the surface of the carbon; this result is based on data obtained by cyclic voltammetry, pulse voltammetry and by release of 14C from bonded CoTAA. Half-cell tests at 100/sup 0/C in 85% phosphoric acid have shown that CoTaa bonded to the surface of carbon (Vulcan XC-72) via an alkylation procedure is a more active catalyst than is platinum based on a factor of two improvement in Tafel slope; dimeric CoTAA has catalytic activity equal to platinum. Half-cell tests also have shown that bonded CoTAA catalysts do not suffer a loss in potential when air is used as a fuel rather than oxygen. Commercially available PTFE has been shown to be stable four months in 200/sup 0/C 85% phosphoric acid based on lack of change in surface wetting properties, IR and physical characteristics. When stressed electrochemically in 150/sup 0/C 85% phosphoric acid, PTFE has also shown no changes after one month.
- Research Organization:
- ECO, Inc., Cambridge, MA (USA)
- DOE Contract Number:
- AI01-77ET11272
- OSTI ID:
- 6729428
- Report Number(s):
- DOE/NASA/0150-80/5; NASA-CR-165198
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
30 DIRECT ENERGY CONVERSION
300503* -- Fuel Cells-- Materials
Components
& Auxiliaries
ACETIC ACID
ACID ELECTROLYTE FUEL CELLS
AIR
ALKYLATION
BONDING
CARBON
CARBOXYLIC ACIDS
CATALYSTS
CATALYTIC EFFECTS
CATHODES
CHEMICAL REACTIONS
COBALT COMPLEXES
COMPLEXES
DIRECT ENERGY CONVERTERS
ELECTROCATALYSTS
ELECTROCHEMICAL CELLS
ELECTRODES
ELEMENTS
FABRICATION
FLUIDS
FLUORINATED ALIPHATIC HYDROCARBONS
FUEL CELLS
GASES
HALOGENATED ALIPHATIC HYDROCARBONS
HYDROGEN COMPOUNDS
INORGANIC ACIDS
JOINING
LIGANDS
MONOCARBOXYLIC ACIDS
NONMETALS
ORGANIC ACIDS
ORGANIC COMPOUNDS
ORGANIC FLUORINE COMPOUNDS
ORGANIC HALOGEN COMPOUNDS
ORGANIC POLYMERS
OXYGEN
PERFORMANCE
PHOSPHORIC ACID
POLYETHYLENES
POLYMERS
POLYOLEFINS
POLYTETRAFLUOROETHYLENE
TRANSITION ELEMENT COMPLEXES
VOLTAMETRY
300503* -- Fuel Cells-- Materials
Components
& Auxiliaries
ACETIC ACID
ACID ELECTROLYTE FUEL CELLS
AIR
ALKYLATION
BONDING
CARBON
CARBOXYLIC ACIDS
CATALYSTS
CATALYTIC EFFECTS
CATHODES
CHEMICAL REACTIONS
COBALT COMPLEXES
COMPLEXES
DIRECT ENERGY CONVERTERS
ELECTROCATALYSTS
ELECTROCHEMICAL CELLS
ELECTRODES
ELEMENTS
FABRICATION
FLUIDS
FLUORINATED ALIPHATIC HYDROCARBONS
FUEL CELLS
GASES
HALOGENATED ALIPHATIC HYDROCARBONS
HYDROGEN COMPOUNDS
INORGANIC ACIDS
JOINING
LIGANDS
MONOCARBOXYLIC ACIDS
NONMETALS
ORGANIC ACIDS
ORGANIC COMPOUNDS
ORGANIC FLUORINE COMPOUNDS
ORGANIC HALOGEN COMPOUNDS
ORGANIC POLYMERS
OXYGEN
PERFORMANCE
PHOSPHORIC ACID
POLYETHYLENES
POLYMERS
POLYOLEFINS
POLYTETRAFLUOROETHYLENE
TRANSITION ELEMENT COMPLEXES
VOLTAMETRY