Deposition and electrical properties of thin porous ceramic electrode layers for solid oxide fuel cell application

Journal Article · Mon Jul 01 00:00:00 EDT 1991 · Journal of the Electrochemical Society; (United States)

DOI:https://doi.org/10.1149/1.2085910· OSTI ID:7204052

de Haart, L G.J.; Kuipers, R A; de Vries, K J; Burggraaf, A J ^[1]

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1. Lab. of Inorganic Chemistry, Materials Science and Catalysis, Dept. of Chemical Technology, Univ. of Twente, P.O. Box 217, 7500 AE Enschede (NL)

This paper reports on the influence of the microstructure on the electrical properties and polarization behavior of thin porous ceramic electrode layers used in solid oxide fuel cells. Thin layers (2-10 {mu}m) of the cathode material Sr{sub 0.15}La{sub 0.85}MnO{sub 3} (15SLM) were film coated on YSZ substrates from classified suspensions. Narrow particle-size distributions in the suspension resulted in close-packed layers with a very homogeneous porosity and pore-size distribution. The specific conductivity of the layers decreased significantly with increasing porosity and pore-size distribution. The specific conductivity of the layers decreased significantly with increasing porosity and mean pore size. A specific conductivity of 109 S {center dot} cm{sup {minus}1} was obtained at 1000{degrees} C for a 2.9 {mu}m thick layer from a suspension with particles in the range 0.10-0.25 {mu}m. The current-overvoltage behavior of the film-coated layers presented in this study did not, however, show any significant dependence on the thickness and the microstructure of the porous layers. Overvoltages ({eta}) at a current density of 0.1 A/cm{sup 2} at 898{degrees} C were quite low, i.e., in the range 60-70 mV. In comparison with other studies it is shown that film coating improves the microstructure of the ceramic electrode layers, which in turn lowers the cathodic overvoltages for the oxygen reduction reaction.

• OSTI ID: 7204052
• Journal Information: Journal of the Electrochemical Society; (United States), Vol. 138:7; ISSN 0013-4651
• Country of Publication: United States
• Language: English

Related Subjects

30 DIRECT ENERGY CONVERSION
36 MATERIALS SCIENCE
CERAMICS
ELECTRICAL PROPERTIES
ELECTRODES
MICROSTRUCTURE
MATERIALS TESTING
SOLID ELECTROLYTE FUEL CELLS
THIN FILMS
CRYSTAL STRUCTURE
DIRECT ENERGY CONVERTERS
ELECTROCHEMICAL CELLS
FILMS
FUEL CELLS
PHYSICAL PROPERTIES
TESTING
300503* - Fuel Cells- Materials
Components
& Auxiliaries
300505 - Fuel Cells- Electrochemistry
Mass Transfer & Thermodynamics
360204 - Ceramics
Cermets
& Refractories- Physical Properties
360202 - Ceramics
Cermets
& Refractories- Structure & Phase Studies