Gd{sub 1{minus}x}A{sub x}Mn{sub 1{minus}y}Co{sub y}O{sub 3{minus}{delta}} (A = Sr, Ca) as a cathode for solid-oxide fuel cells

Journal Article · Tue Jun 01 04:00:00 EDT 1999 · Journal of the Electrochemical Society

DOI:https://doi.org/10.1149/1.1391895· OSTI ID:680023

Tu, H Y; Takeda, Y; Ichikawa, T; Imanishi, N; Yamamoto, O ^[1]; Phillipps, M B; Sammes, N M ^[2]

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

The Gd{sub 1{minus}x}A{sub x}Mn{sub 1{minus}y}Co{sub y}O{sub 3{minus}{delta}} (A = Sr, Ca) systems were examined as a cathode for use in solid oxide fuel cells. The electrical conductivity and cathodic polarization on an 8 mol % yttria-stabilized zirconia (8YSZ) electrolyte had acceptable values for certain compositions. Thermal expansion measurements were taken, showing compatibility of Mn-rich compositions with the 8YSZ electrolyte. Reactivity with 8YSZ revealed the formation of SrZrO{sub 3} or CaZrO{sub 3} at lower temperatures for high Co containing compositions. No reaction product was detected between Gd{sub 0.8}Ca{sub 0.2}Mn{sub 1{minus}y}Co{sub y}O{sub 3{minus}{delta}} and 8YSZ. However, significant diffusion of Co into 8YSZ was found at the Gd{sub 0.8}Ca{sub 0.2}Mn{sub 0.4}Co{sub 0.6}O{sub 3{minus}{delta}}/8YSZ interface after annealing at 1200 C for 24 h.

• OSTI ID: 680023
• Journal Information: Journal of the Electrochemical Society, Journal Name: Journal of the Electrochemical Society Journal Issue: 6 Vol. 146; ISSN 0013-4651; ISSN JESOAN
• Country of Publication: United States
• Language: English

Related Subjects

30 DIRECT ENERGY CONVERSION
36 MATERIALS SCIENCE
CALCIUM OXIDES
CATHODES
COBALT OXIDES
ELECTRIC CONDUCTIVITY
GADOLINIUM OXIDES
MANGANESE OXIDES
SOLID ELECTROLYTE FUEL CELLS
STRONTIUM OXIDES
THERMAL EXPANSION