High performance Gd{sup 3+} and Y{sup 3+} co-doped ceria-based electrolytes for intermediate temperature solid oxide fuel cells

Journal Article · Tue Apr 01 04:00:00 EDT 2008 · Materials Research Bulletin

DOI:https://doi.org/10.1016/j.materresbull.2007.04.027· OSTI ID:21068256

Heping, Zhou ^[1]; Zhihui, Liu ^[2]; Yanan, Wang; Jun, Zhang ^[1]

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1. State Key Laboratory of New Ceramics and Fine Processing, Department of Materials Science and Engineering, Tsinghua University, Beijing 100084 (China)
2. Southwest Institute of Electronic Equipment, Chengdu 610036 (China)

Co-doped ceria of Ce{sub 1-x}Gd{sub x-y}Y{sub y}O{sub 2-0.5x}, wherein x = 0.15 and 0.2, 0 {<=} y {<=} x, were prepared by glycine-nitrate method. Their structures and ionic conductivities were characterized by X-ray diffraction (XRD) and AC impedance spectroscopy (IS). All the electrolytes were found to be ceria-based solid solutions of fluorite type structures. Co-doping was found to effectively enhance the conductivity. In comparison to the singly doped ceria, the co-doped ceria showed much higher ionic conductivities at 673-973 K. At 773 K, the ionic conductivity of Ce{sub 0.8}Gd{sub 0.05}Y{sub 0.15}O{sub 1.9} is 0.013 S cm{sup -1} which is three times as high as that of Ce{sub 0.8}Gd{sub 0.2}O{sub 1.9}. These Gd{sup 3+}and Y{sup 3+} co-doped ceria are ideal electrolyte materials of intermediate temperature solid oxide fuel cells (SOFCs)

• OSTI ID: 21068256
• Journal Information: Materials Research Bulletin, Journal Name: Materials Research Bulletin Journal Issue: 4 Vol. 43; ISSN MRBUAC; ISSN 0025-5408
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
CERIUM OXIDES
DOPED MATERIALS
ELECTROLYTES
ELECTRON MICROSCOPY
FLUORITE
GADOLINIUM IONS
GADOLINIUM OXIDES
GLYCINE
IMPEDANCE
IONIC CONDUCTIVITY
NITRATES
SOLID OXIDE FUEL CELLS
SOLID SOLUTIONS
SPECTROSCOPY
TEMPERATURE RANGE 0400-1000 K
TEMPERATURE RANGE 1000-4000 K
X-RAY DIFFRACTION
YTTRIUM IONS
YTTRIUM OXIDES