Basu, Rajendra Nath and Tietz, F and Teller, O and Wessel, E and Buchkremer, H P and Stover, D (2003) LaNi(0.6)Fe(0.4)O(3) as a cathode contact material for solid oxide fuel cells. Journal of Solid State Electrochemistry, 7 (7). pp. 416-420. ISSN 1432-8488

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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 degreesC) 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, LaNi(0.6)Fe(0.4)O(3) was tested as a cathode contact material. Its performance at 800 degreesC in the form of a similar to50 mum thick film applied on two ferritic steel compositions was examined. After 600 h of testing, contact resistances of 60 and 160 mOmega cm(2) were obtained. The different values are explained by the variation in steel composition.

Item Type: Article
Uncontrolled Keywords: solid oxide fuel cell; ferritic steel interconnect; lanthanum nickel ferrite; contact resistance
Subjects: Electronics
Depositing User: Subhra Lahiri
Date Deposited: 13 Feb 2012 11:17
Last Modified: 13 Feb 2012 11:17

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