Design of a dual-layer ceramic interconnect based on perovskite oxides for segmented-in-series solid oxide fuel cells

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A segmented-in series (SIS) SOFC consists of segmented unit cells connected in electrical series and shows improved stack efficiency over conventional SOFCs. In this design, a thin interconnect film provides both electrical contact and sealing between the anode of one cell and the cathode of the next; thus, it should have high conductivity and chemical/structural stability in both reducing and oxidizing atmospheres as well as impermeability to gases. Here, we report a dual-layer interconnect film for SIS -SOFCs comprising perovskite-type oxides, Sr0.7La0.2TiO3 (exposed to a reducing atmosphere) and La0.8Sr0.2FeO3 (exposed to an oxidizing atmosphere). The interconnect film is not only very dense but also highly conductive and stable under SOFC operating conditions; in particular, it shows an area-specific resistance of 19.6 m Omega cm(2) at 800 similar to degrees C, which is much lower than the generally accepted limit for SOFCs. A flat-tubular SIS-SOFC fabricated using these interconnect films exhibits a power density as high as 340 mW cm(-2), which proves the feasibility of the dual-layer interconnect design.
Publisher
ELSEVIER SCIENCE BV
Issue Date
2015-12
Language
English
Article Type
Article
Keywords

YTTRIA-STABILIZED ZIRCONIA; DOPED STRONTIUM-TITANATE; CATHODE; ELECTROLYTE; PERFORMANCE; STACK; CO

Citation

JOURNAL OF POWER SOURCES, v.300, pp.318 - 324

ISSN
0378-7753
DOI
10.1016/j.jpowsour.2015.09.082
URI
http://hdl.handle.net/10203/207461
Appears in Collection
MS-Journal Papers(저널논문)
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