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Material characterization in support of the development of an anode substrate for solid oxide fuel cells

Published online by Cambridge University Press:  31 January 2011

D. Simwonis ,
A. Naoumidis ,
F. J. Dias ,
J. Linke  and
A. Moropoulou
D. Simwonis
Affiliation:
Department of Chemical Engineering, National Technical University of Athens, Athens GR-15773, Greece
A. Naoumidis
Affiliation:
Institute for Materials in Energy Systems (IWE), Forschungszentrum Jülich GmbH, Jülich D-52425, Germany
F. J. Dias
Affiliation:
Institute for Materials in Energy Systems (IWE), Forschungszentrum Jülich GmbH, Jülich D-52425, Germany
J. Linke
Affiliation:
Institute for Materials in Energy Systems (IWE), Forschungszentrum Jülich GmbH, Jülich D-52425, Germany
A. Moropoulou
Affiliation:
Department of Chemical Engineering, National Technical University of Athens, Athens GR-15773, Greece
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Abstract

A new design for solid oxide fuel cells (SOFC's) was developed aiming at the reduction of the total electrical resistance of the cell. The thickness of the electrolyte was decreased, while the anode took on the role of the substrate. The pore structure with respect to gas permeability of this component has to be optimized for the proper operation of this design. Anode substrates, consisting of a cermet (yttrium-stabilized ZrO2 and metallic Ni) and produced by two different processes, coat mix and tape casting, were characterized with respect to pore structure (shape and mean radius), porosity (total, open and permeable), pore size distribution and air permeability. The following methods were used: (i) optical and electron scanning microscopy in combination with image analysis, (ii) mercury porosity, and (iii) air permeability. Correlations between air permeability and porosity and also the percentage of permeable pores in anodes show the superiority of coat mix samples to tape-cast ones. It has been observed that the coat mix process can produce anode substrates with interconnecting porosity, while tape casting, as used in this study, needs some modifications in order to be appropriate for this purpose.

Type
Articles
Information
Journal of Materials Research , Volume 12 , Issue 6 , June 1997 , pp. 1508 - 1518
Copyright
Copyright © Materials Research Society 1997

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