Preparation and evaluation of electrocatalysts for phosphoric-acid fuel cells. Final technical report, May 1, 1978-December 31, 1979
The overall objective of this electrocatalysis program was to define the feasibility of lowering the electrocatalyst cost and to increase the electrocatalyst activity in phosphoric acid fuel cells to improve the commercial viability of fuel cells for producing electric power. Highly dispersed platinum was placed on carbon supports. These catalysts were characterized for both the platinum surface areas and crystallite sizes. For a given carbon impregnation technique with the noble metal salt, a definite correlation between the specific surface area of the derived platinum crystallites and the BET surface area of the carbon support was found. A high dispersion of platinum was achieved on a novel high surface area catalyst support - CONSEL. Using high resolution phase contrast electron microscopy, the crystal lattice of highly dispersed platinum on carbon was resolved and, with the lattice images of graphitic carbon black as an internal calibration, the lattice spacing for a small crystallite of platinum was measured within 2% of the value for bulk platinum. Twenty-one catalysts were formulated with variations in the type of carbon support, the platinum metal loading, and the platinum crystallite size. Characteristics and test results are described. (WHK)
- Research Organization:
- Stonehart Associates, Inc., Madison, CT (USA)
- DOE Contract Number:
- AC03-78ET15365
- OSTI ID:
- 5400157
- Report Number(s):
- DOE/ET/15365-T2; ON: DE82006984
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ACID ELECTROLYTE FUEL CELLS
ELECTROCATALYSTS
CHEMICAL PREPARATION
PERFORMANCE TESTING
CARBON
CARBON MONOXIDE
CATALYST SUPPORTS
COST
ELECTRON MICROSCOPY
HYDROGEN
IMPREGNATION
OXIDATION
OXYGEN
PARTICLE SIZE
PERFORMANCE
PHOSPHORIC ACID
PLATINUM
POISONING
REDUCTION
CARBON COMPOUNDS
CARBON OXIDES
CATALYSTS
CHALCOGENIDES
CHEMICAL REACTIONS
DIRECT ENERGY CONVERTERS
ELECTROCHEMICAL CELLS
ELEMENTS
FUEL CELLS
HYDROGEN COMPOUNDS
INORGANIC ACIDS
METALS
MICROSCOPY
NONMETALS
OXIDES
OXYGEN COMPOUNDS
PLATINUM METALS
SIZE
SYNTHESIS
TESTING
TRANSITION ELEMENTS
300503* - Fuel Cells- Materials
Components
& Auxiliaries