La and Ca co-doped ceria-based electrolyte materials for IT-SOFCs

Journal Article · Wed Aug 05 04:00:00 EDT 2009 · Materials Research Bulletin

DOI:https://doi.org/10.1016/J.MATERRESBULL.2009.03.017· OSTI ID:22029830

Yifeng, Zheng; Yueming, Shi; Haitao, Gu; Ling, Gao; Han, Chen ^[1]

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1. College of Material Science and Engineering, Nanjing University of Technology, No.5 Xinmofan Road, Nanjing, Jiangsu 210009 (China)

Co-doped ceria-based electrolytes of Ce{sub 1-x}La{sub x-y}Ca{sub y}O{sub 2-{delta}}, wherein x = 0.15 and 0.20, 0 {<=} y {<=} x, were sintered from powders obtained by solid state reaction method. The phase identification, thermal expansion and ionic conductivities of samples were studied by X-ray diffraction (XRD), dilatometry and AC impedance spectroscopy (IS). Results showed that the samples of co-doping with La and Ca can significantly increase the ionic conductivity and lower activation energies compared with those of the singly doped ones in the temperature range of 500-800 deg. C. The ionic conductivities of co-doping samples decrease with Ca content. Although both systems reached the optimum ionic conductivity at y = 0.05, Ce{sub 0.85}La{sub 0.15-y}Ca{sub y}O{sub 2-{delta}} exhibits better electrical performance. The results also showed that all the synthesized samples were fluorite-type ceria-based solid solutions. The thermal expansion was linear for all the samples.

• OSTI ID: 22029830
• Journal Information: Materials Research Bulletin, Journal Name: Materials Research Bulletin Journal Issue: 8 Vol. 44; ISSN MRBUAC; ISSN 0025-5408
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ACTIVATION ENERGY
CERAMICS
DILATOMETRY
DOPED MATERIALS
ELECTROLYTES
FLUORITE
IONIC CONDUCTIVITY
POWDERS
SOLID OXIDE FUEL CELLS
SOLID SOLUTIONS
SOLIDS
SPECTROSCOPY
THERMAL EXPANSION
X-RAY DIFFRACTION