Relations between performance and structure of Ni-YSZ-cermet SOFC anodes

Book · Sun Dec 31 04:00:00 EST 1995

OSTI ID:242520

Mogensen, M; Primdahl, S; Rheinlaender, J T; Gormsen, S; Linderoth, S; Brown, M ^[1]

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1. Risoe National Lab. (Denmark). Materials Dept.

A number of different Ni-YSZ cermet structures are studied in H{sub 2}/H{sub 2}O in the range of 800--1,000 C by means of impedance spectroscopy and DC-electrochemical methods. The electrochemical performance is correlated with the structure of the cermets as revealed by microscopy. Quantitative image analysis is used in describing some of the microstructures. Experiments are carried out on both very fine and very coarse structures including the limiting case of a Ni-point electrode. Three arches are observed in the impedance spectra. The dependence of the three associated polarization resistance components on structure, temperature and overvoltage is reported. A tentative model for the Ni-YSZ-H{sub 2}/H{sub 2}O electrode is described.

• OSTI ID: 242520
• Report Number(s): CONF-950683--; ISBN 1-56677-095-5
• Country of Publication: United States
• Language: English

Related Subjects

30 DIRECT ENERGY CONVERSION
36 MATERIALS SCIENCE
ANODES
CERMETS
ELECTRIC IMPEDANCE
EXPERIMENTAL DATA
HYDROGEN
MATHEMATICAL MODELS
MICROSTRUCTURE
MORPHOLOGY
NICKEL
PERFORMANCE
SOLID ELECTROLYTE FUEL CELLS
TEMPERATURE DEPENDENCE
WATER VAPOR
YTTRIUM OXIDES
ZIRCONIUM OXIDES