Original Paper

Journal of Solid State Electrochemistry

, Volume 7, Issue 7, pp 416-420

First online:

LaNi0.6Fe0.4O3 as a cathode contact material for solid oxide fuel cells

  • Rajendra N. BasuAffiliated withForschungszentrum Jülich GmbH, Institute for Materials and Processing in Energy Systems (IWV), 52425 Julich, GermanyPermanent address: Central Glass & Ceramic Research Institute, Calcutta 700 032, India
  • , Frank TietzAffiliated withForschungszentrum Jülich GmbH, Institute for Materials and Processing in Energy Systems (IWV), 52425 Julich, Germany Email author 
  • , Oliver TellerAffiliated withForschungszentrum Jülich GmbH, Institute for Materials and Processing in Energy Systems (IWV), 52425 Julich, GermanyW.L. Gore & Associates GmbH, P.O. Box 1152, 85636 Munich, Germany
  • , Egbert WesselAffiliated withForschungszentrum Jülich GmbH, Institute for Materials and Processing in Energy Systems (IWV), 52425 Julich, Germany
  • , Hans Peter BuchkremerAffiliated withForschungszentrum Jülich GmbH, Institute for Materials and Processing in Energy Systems (IWV), 52425 Julich, Germany
  • , Detlev StöverAffiliated withForschungszentrum Jülich GmbH, Institute for Materials and Processing in Energy Systems (IWV), 52425 Julich, 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.

Keywords.

Solid oxide fuel cell Ferritic steel interconnect Lanthanum nickel ferrite Contact resistance