Pr{sub 0.8}Sr{sub 0.2}Mn{sub 1{minus}x}Co{sub x}O{sub 3} cathode material for SOFC operating at a reduced temperature

Book · Sun Dec 31 04:00:00 EST 1995

OSTI ID:242501

Chiba, Reiichi; Ishii, Takao ^[1]

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1. NTT, Tokai, Ibaraki (Japan). Interdisciplinary Research Labs.

The author investigated the characteristics of Pr{sub 0.8}Sr{sub 0.2}Mn{sub 1{minus}x}Co{sub x}O{sub 3} as a cathode material for Solid Oxide Fuel Cells operating at a reduced temperature. Single phase Pr{sub 0.8}Sr{sub 0.2}Mn{sub 1{minus}x}Co{sub x}O{sub 3} (0{<=}x{<=}1.0) was prepared in order to investigate the electrical conductivity, and thermal expansion. When x is between 0 and 0.3, the thermal expansion coefficient of Pr{sub 0.8}Sr{sub 0.2}Mn{sub 1{minus}x}Co{sub x}O{sub 3} is less than 1.2 {times} 10{sup {minus}5} K{sup {minus}1}, which is the value for Pr{sub 0.8}Sr{sub 0.2}MnO{sub 3}. The overpotential between Pr{sub 0.8}Sr{sub 0.2}Mn{sub 1{minus}x} Co{sub x}O{sub 3} (x = 0.0, 0.5, 1.0) cathodes and YSZ (8mol.% yttria) electrolyte (anode: Ni-YSZ cermet) was investigated from 850 C to 700 C by the AC impedance method. Although the exchange current density for cathodes containing Co is lower than those with Pr{sub 0.8}Sr{sub 0.2}MnO{sub 3}, their overpotential at a high current density is smaller than those with Pr{sub 0.8}Sr{sub 0.2}MnO{sub 3} because of their large charge transfer coefficients.

• OSTI ID: 242501
• Report Number(s): CONF-950683--; ISBN 1-56677-095-5
• Country of Publication: United States
• Language: English

Related Subjects

30 DIRECT ENERGY CONVERSION
36 MATERIALS SCIENCE
CATHODES
CERMETS
COBALT OXIDES
ELECTRIC CONDUCTIVITY
EXPERIMENTAL DATA
MANGANESE OXIDES
NICKEL
PRASEODYMIUM OXIDES
SOLID ELECTROLYTE FUEL CELLS
SOLID ELECTROLYTES
STOICHIOMETRY
STRONTIUM OXIDES
TEMPERATURE DEPENDENCE
THERMAL EXPANSION
YTTRIUM OXIDES
ZIRCONIUM OXIDES