Interconnection materials development for solid oxide fuel cells. Final report, September 30, 1984-September 30, 1985

Technical Report · Mon Sep 30 00:00:00 EDT 1985

OSTI ID:6327786

Singhal, S C; Ruka, R J; Sinharoy, S

Electrical conductivity, thermal expansion, and oxygen loss and oxygen transport rates have been determined for the electrochemically vapor deposited thin films of magnesium-doped lanthanum chromite which is currently used as the interconnection material in the high temperature solid oxide fuel cell. Electrical conductivity of these interconnection films has been found to decrease with a decrease in oxygen pressure; these conductivities at different oxygen partial pressures have been related theoretically to the oxygen loss data. The conductivity of the presently used interconnection material is adequate for the solid oxide fuel cell operation, but can be increased by increasing the magnesium concentration in the lanthanum chromite. The thermal expansion of the interconnection films has been found to be about 12 to 14% lower than of the calcia-stabilized zirconia support tube of the solid oxide fuel cell. It is considered desirable to increase this thermal expansion by chemical modification of the interconnection material. The permeation rates of oxygen through electrochemically vapor deposited thin films of magnesium-doped lanthanum chromite under fuel cell operating conditions have been found to be extremely low. Such oxygen permeation, therefore, should not cause any significant loss in the open circuit voltage or the efficiency of the solid oxide fuel cell under normal operating conditions. 10 refs., 17 figs.

• Research Organization: Westinghouse Electric Corp., Pittsburgh, PA (USA). Research and Development Center
• DOE Contract Number: AC21-84MC21184
• OSTI ID: 6327786
• Report Number(s): DOE/MC/21184-1985; ON: DE86003941
• Country of Publication: United States
• Language: English

Related Subjects

30 DIRECT ENERGY CONVERSION
CONNECTORS
ELECTRIC CONDUCTIVITY
PERMEABILITY
THERMAL EXPANSION
FUEL CELLS
MATERIALS
CHEMICAL VAPOR DEPOSITION
CHROMIUM OXIDES
CORRELATIONS
ELECTRON MICROPROBE ANALYSIS
EXPERIMENTAL DATA
FABRICATION
LANTHANUM OXIDES
MAGNESIUM
OXYGEN
PARTIAL PRESSURE
SOLID ELECTROLYTES
TEMPERATURE DEPENDENCE
THIN FILMS
TRANSPORT
ALKALINE EARTH METALS
CHALCOGENIDES
CHEMICAL ANALYSIS
CHEMICAL COATING
CHROMIUM COMPOUNDS
CONDUCTOR DEVICES
DATA
DEPOSITION
DIRECT ENERGY CONVERTERS
ELECTRICAL EQUIPMENT
ELECTRICAL PROPERTIES
ELECTROCHEMICAL CELLS
ELECTROLYTES
ELEMENTS
EQUIPMENT
EXPANSION
FILMS
INFORMATION
LANTHANUM COMPOUNDS
METALS
MICROANALYSIS
NONMETALS
NUMERICAL DATA
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
RARE EARTH COMPOUNDS
SURFACE COATING
TRANSITION ELEMENT COMPOUNDS
300503* - Fuel Cells- Materials
Components
& Auxiliaries