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Characterization of Multilayer Anodes for SOFC

Published online by Cambridge University Press:  11 February 2011

Axel C. Müller ,
Albert Krügel ,
André Weber  and
Ellen Ivers-Tiffée
Axel C. Müller
Affiliation:
Institut für Werkstoffe der Elektrotechnik, Universität Karlsruhe (TH) D-76131 Karlsruhe, Germany
Albert Krügel
Affiliation:
Institut für Werkstoffe der Elektrotechnik, Universität Karlsruhe (TH) D-76131 Karlsruhe, Germany
André Weber
Affiliation:
Institut für Werkstoffe der Elektrotechnik, Universität Karlsruhe (TH) D-76131 Karlsruhe, Germany
Ellen Ivers-Tiffée
Affiliation:
Institut für Werkstoffe der Elektrotechnik, Universität Karlsruhe (TH) D-76131 Karlsruhe, Germany
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Abstract

SOFC anodes have to combine various tasks. In anode supported single cells a thick anode substrate is used for current collecting and gas distribution whereas a thin functional layer adjacent to the electrolyte is the electrochemically active part of the anode. This functional anode layer is cofired together with the thin film electrolyte to obtain an enhanced interface with low polarisation losses. This multilayer structure was transferred to an electrolyte supported single cell. The electrochemical active Ni/8YSZ anode layer was screen printed onto a 8YSZ electrolyte green tape and subsequently cofired at 1350 °. Mechanical stresses during cofiring due to shrinkage mismatch of anode and electrolyte were avoided by changing the geometry of the anode layer from a continuous layer to a large number of small sized individual areas. Simulations by finite element modeling indicated that a hexagonal pattern similar to honeycombs is preferable. The second layer which adjoins to the fuel gas channels and which is responsible for current collecting and gas distribution was later on screen printed on top and sintered together with the cathode. Single cells with a multilayer anode and different functional layers were electrochemically characterised under realistic operation conditions. The performance and reduction/oxidation stability of this type of anode was investigated. The electrochemically active layer showed only small degradation during redox cycling and long term operation at high fuel utilisation. In contradiction to single layer anodes Nickel agglomeration was not observed in the functional layer.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 756: Symposia EE/FF – Solid-State Ionics – Materials for Fuel Cells and Fuel Processors , 2002 , EE10.4
Copyright
Copyright © Materials Research Society 2003

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References

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