Gd{sub 1{minus}x}A{sub x}MnO{sub 3} and Gd{sub 1{minus}x}A{sub x}CoO{sub 3} (A = Ca,Sr) for the electrode of solid oxide fuel cells

Book · Sun Dec 31 04:00:00 EST 1995

OSTI ID:242495

Yamamoto, O; Watanabe, S; Ueno, H; Imanishi, N; Takeda, Y ^[1]; Sammes, N; Phillipps, M B ^[2]

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1. Mie Univ., Tsu (Japan)
2. Univ. of Waikato, Hamilton (New Zealand). Center for Technology

The electrical conductivities of the sintered samples of Gd{sub 1{minus}x}A{sub x}MnO{sub 3} and Gd{sub 1{minus}x}A{sub x}CoO{sub 3} (A = Ca, Sr) were measured as a function of x in the temperature range 30 C to 1,000 C. The highest conductivity of around 400 S/cm at 1,000 C was found in Gd{sub 0.9}Sr{sub 0.1}CoO{sub 3}. The cathodic polarization of these oxide electrodes, sputtered on yttria stabilized zirconia (YSZ), was studied at 700--1,000 C in air. The lowest polarization was observed in GdCoO{sub 3}. The reactivity of gadolinium based perovskite oxides with YSZ was examined. No reaction product in the Gd{sub 1{minus}x}Ca{sub x}MnO{sub 3} (0.1{<=}x{<=}0.6) and YSZ couple was observed after 96h at 1,200 C. The Sr doped GdCoO{sub 3} was more reactive with YSZ and produced SrZrO{sub 3} at 850 C after 94h. On the other hand, no reaction product between GdCoO{sub 3} and YSZ was observed at 1,000 C for 96h.

• OSTI ID: 242495
• 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
CALCIUM OXIDES
CATHODES
CHEMICAL COMPOSITION
COBALT OXIDES
CRYSTAL STRUCTURE
ELECTRIC CONDUCTIVITY
EXPERIMENTAL DATA
GADOLINIUM OXIDES
MANGANESE OXIDES
PHASE STUDIES
SOLID ELECTROLYTE FUEL CELLS
STRONTIUM OXIDES
TEMPERATURE DEPENDENCE
YTTRIUM OXIDES
ZIRCONIUM OXIDES