High performance Gd{sup 3+} and Y{sup 3+} co-doped ceria-based electrolytes for intermediate temperature solid oxide fuel cells
- State Key Laboratory of New Ceramics and Fine Processing, Department of Materials Science and Engineering, Tsinghua University, Beijing 100084 (China)
- 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, Vol. 43, Issue 4; Other Information: DOI: 10.1016/j.materresbull.2007.04.027; PII: S0025-5408(07)00169-9; Copyright (c) 2007 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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Related Subjects
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