Properties and performance of La{sub 1.6}Sr{sub 0.4}NiO{sub 4+{delta}}-Ce{sub 0.8}Sm{sub 0.2}O{sub 1.9} composite cathodes for intermediate temperature solid oxide fuel cells

La{sub 1.6}Sr{sub 0.4}NiO{sub 4+{delta}}-Ce{sub 0.8}Sm{sub 0.2}O{sub 1.9} composite cathodes were prepared successfully using combustion synthesis method for intermediate temperature solid oxide fuel cells. The chemical compatibility, thermal expansion behavior, electrical conductivity and electrode...

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Bibliographic Details
Published in:Materials research bulletin 2009-08, Vol.44 (8)
Main Authors: Gong Mingguang, Lu Lihua, Zhang Hua, Gao Lirong, Guo Youbin, Jin Jiang
Format: Article
Language:English
Subjects:
CATHODES
ELECTRIC CONDUCTIVITY
MATERIALS SCIENCE
SOL-GEL PROCESS
SOLID OXIDE FUEL CELLS
SPECTROSCOPY
SYNTHESIS
THERMAL EXPANSION
X-RAY DIFFRACTION
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Summary:La{sub 1.6}Sr{sub 0.4}NiO{sub 4+{delta}}-Ce{sub 0.8}Sm{sub 0.2}O{sub 1.9} composite cathodes were prepared successfully using combustion synthesis method for intermediate temperature solid oxide fuel cells. The chemical compatibility, thermal expansion behavior, electrical conductivity and electrode performance were studied. The X-ray diffraction of La{sub 1.6}Sr{sub 0.4}NiO{sub 4+{delta}}-Ce{sub 0.8}Sm{sub 0.2}O{sub 1.9} composite result proved a slight reaction between La{sub 1.6}Sr{sub 0.4}NiO{sub 4+{delta}} and Ce{sub 0.8}Sm{sub 0.2}O{sub 1.9}. Both the thermal expansion coefficient and the electrical conductivity of La{sub 1.6}Sr{sub 0.4}NiO{sub 4+{delta}}-Ce{sub 0.8}Sm{sub 0.2}O{sub 1.9} decreased with increasing Ce{sub 0.8}Sm{sub 0.2}O{sub 1.9} content. AC impedance spectroscopy measurements indicated that the addition of 30 wt% Ce{sub 0.8}Sm{sub 0.2}O{sub 1.9} to La{sub 1.6}Sr{sub 0.4}NiO{sub 4+{delta}} exhibited the lowest polarization resistance (0.238 {Omega}cm{sup 2}) at 800 deg. C in air, which was only one fourth of the La{sub 1.6}Sr{sub 0.4}NiO{sub 4+{delta}} electrode measured at the same temperature.
ISSN:0025-5408
1873-4227
DOI:10.1016/J.MATERRESBULL.2009.04.016