Physical properties of mixed conductor solid oxide fuel cell anodes of doped CeO[sub 2]

Journal Article · Mon Aug 01 04:00:00 EDT 1994 · Journal of the Electrochemical Society; (United States)

DOI:https://doi.org/10.1149/1.2055072· OSTI ID:7186587

Mogensen, M; Lindegaard, T; Hansen, U R ^[1]; Mogensen, G ^[2]

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1. Risoe National Lab., Roskilde (Denmark). Materials Dept.
2. Haldor Topsoe A/S, Lyngby (Denmark)

Samples of CeO[sub 2] doped with oxides such as CaO and Gd[sub 2]O[sub 3] were prepared. Their conductivities and expansions on reduction were measured at 1,000 C, and the thermal expansion coefficients in the range 50 to 1,000 C were determined. The ionic and electronic conductivity were derived from curves of total conductivity vs. oxygen partial pressure. For both types of conductivity a dependence on dopant valency was observed. The electronic conductivity was independent of dopant radius in contrast to the ionic which was highly dependent. These measured physical properties are compared with the ideal requirements for solid oxide fuel cell anodes. Not all requirements are fulfilled. Measures to compensate for this are discussed.

• OSTI ID: 7186587
• Journal Information: Journal of the Electrochemical Society; (United States), Journal Name: Journal of the Electrochemical Society; (United States) Vol. 141:8; ISSN JESOAN; ISSN 0013-4651
• Country of Publication: United States
• Language: English

Related Subjects

30 DIRECT ENERGY CONVERSION
300503* -- Fuel Cells-- Materials
Components
& Auxiliaries
36 MATERIALS SCIENCE
360204 -- Ceramics
Cermets
& Refractories-- Physical Properties
ALKALINE EARTH METAL COMPOUNDS
ANODES
CALCIUM COMPOUNDS
CALCIUM OXIDES
CERIUM COMPOUNDS
CERIUM OXIDES
CHALCOGENIDES
COHERENT SCATTERING
DIFFRACTION
DIRECT ENERGY CONVERTERS
DOPED MATERIALS
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
ELECTROCHEMICAL CELLS
ELECTRODES
FUEL CELLS
GADOLINIUM COMPOUNDS
GADOLINIUM OXIDES
MATERIALS
NATURAL GAS FUEL CELLS
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
RARE EARTH COMPOUNDS
SCATTERING
SOLID ELECTROLYTE FUEL CELLS
VALENCE
X-RAY DIFFRACTION