Interconnects play two key roles in high-temperature solid oxide fuel cells (SOFC): connecting cells electrically and separating the reactants. the fact that the interconnect must be compatible with all of the cell components as well as be stable with respect to both oxidizing and reducing gases places very stringent materials requirements on it. the requirements range from compatibility with electrodes and chemical stability to corrosion resistance combined with excellent electronic conductivity. the two types of materials that have been extensively used are the chromite ceramics and the chromium-Based metallic alloys. a number of issues can be listed that need to be addressed before a completely acceptable ceramic interconnect can be developed. However, most of them are of secondary importance when compared to the two major challenges: reduction of fabrication costs and reduction of material costs. the reduction in material costs can be achieved by both the interconnection design and the quantity of interconnect required. However, reduction in fabrication costs will only come with improved processing and automation. Recent results have shown that optimized steels for SOFC applications are available, and alkaline earth-flee and cobalt-containing perovskites are the most suitable materials for contact layers; however, their long-term performance under fuel cell operation conditions needs to be proven.


Materials Science and Engineering

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Article - Journal

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Publication Date

08 Dec 2003