LaNi0.6Fe0.4O3 as a cathode contact material for solid oxide fuel cells |
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Authors: | Rajendra?N?Basu Email author" target="_blank">Frank?TietzEmail author Oliver?Teller Egbert?Wessel Hans?Peter?Buchkremer Detlev?St?ver |
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Institution: | (1) Forschungszentrum Jülich GmbH, Institute for Materials and Processing in Energy Systems (IWV), 52425 Julich, Germany,;(2) Present address: Permanent address: Central Glass & Ceramic Research Institute, Calcutta 700 032, India,;(3) Present address: W.L. Gore & Associates GmbH, P.O. Box 1152, 85636 Munich, Germany, |
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Abstract: | In solid oxide fuel cells (SOFCs) the interconnects electrically link air and fuel electrodes on either side to produce a
practical electrical power output. The long-term stability of intermediate temperature (650–800 °C) SOFC operation strongly
depends on the composition of the ferritic steel interconnection material and the steel/ceramic interface. During high-temperature
operation the Cr-containing ferritic steel forms an oxide scale at its surface, thereby causing high ohmic electrical contact
resistance when connected to the surface of an electronically conducting ceramic cathode material. In the long run, the vaporization
of Cr species from these oxide scales also affects the cathode activity, eventually leading to cell deterioration. One way
of overcoming the problem is to incorporate another electronically conducting ceramic compliant layer, commonly known as the
contact layer, between the cathode and metallic interconnect. In this contribution, LaNi0.6Fe0.4O3 was tested as a cathode contact material. Its performance at 800 °C in the form of a ~50 μm thick film applied on two ferritic
steel compositions was examined. After 600 h of testing, contact resistances of 60 and 160 mΩ cm2 were obtained. The different values are explained by the variation in steel composition. |
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Keywords: | Solid oxide fuel cell Ferritic steel interconnect Lanthanum nickel ferrite Contact resistance |
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