Relations between Performance and Structure of Ni-YSZ-Cermet SOFC Anodes
Open Access
- 1 January 1995
- journal article
- Published by The Electrochemical Society in ECS Proceedings Volumes
- Vol. 1995-1 (1) , 657-666
- https://doi.org/10.1149/199501.0657pv
Abstract
A number of different Ni-YSZ cermet structures are studied in H2/H2O in the range of 800–1000°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-H2/H2O electrode is described.Keywords
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