Study of Ln{sub 0.6}Sr{sub 0.4}Co{sub 0.8}Mn{sub 0.2}O{sub 3-{delta}} (Ln=La, Gd, Sm or Nd) as the cathode materials for intermediate temperature SOFC
Perovskite type oxides Ln{sub 0.6}Sr{sub 0.4}Co{sub 0.8}Mn{sub 0.2}O{sub 3-{delta}} (Ln=La, Gd, Sm, or Nd) have been prepared by the solid state reaction of corresponding oxides. The crystal parameters of the compositions were determined by XRD powder diffraction, which revealed that all the compositions have orthorhombic structure. The reaction test of all samples with Ce{sub 0.8}Gd{sub 0.2}O{sub 1.9} was carried out at 1200 deg. C for 48 h, and no reaction product was detected by XRD. The change in mass of La{sub 0.6}Sr{sub 0.4}Co{sub 0.8}Mn{sub 0.2}O{sub 3-{delta}} as a function of temperature was determined by thermogravimetric analysis (TGA). The electrical conductivity of the sintered samples were measured as a function of temperature from 200 to 1000 deg. C. The highest conductivity of about 1400 S cm{sup -1} was found in La{sub 0.6}Sr{sub 0.4}Co{sub 0.8}Mn{sub 0.2}O{sub 3-{delta}}. The cathodic polarization of these oxides electrodes deposited on Ce{sub 0.8}Gd{sub 0.2}O{sub 1.9} tablet was studied at 500-800 deg. C in air.
- OSTI ID:
- 20887987
- Journal Information:
- Materials Research Bulletin, Vol. 38, Issue 8; Other Information: DOI: 10.1016/S0025-5408(03)00143-0; PII: S0025540803001430; Copyright (c) 2003 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved; Country of input: International Atomic Energy Agency (IAEA); ISSN 0025-5408
- Country of Publication:
- United States
- Language:
- English
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