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Materials Development for Advanced Planar Solid Oxide Fuel Cells
Author(s) -
Tietz Frank,
Fu Qingxi,
Haanappel Vincent A. C.,
Mai Andreas,
Menzler Norbert H.,
Uhlenbruck Sven
Publication year - 2007
Publication title -
international journal of applied ceramic technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.4
H-Index - 57
eISSN - 1744-7402
pISSN - 1546-542X
DOI - 10.1111/j.1744-7402.2007.02156.x
Subject(s) - materials science , anode , cathode , durability , electrolyte , oxide , oxidizing agent , ceramic , chemical engineering , yttria stabilized zirconia , redox , power density , degradation (telecommunications) , solid oxide fuel cell , diffusion , diffusion barrier , nickel , cubic zirconia , composite material , metallurgy , electrode , power (physics) , chemistry , physics , telecommunications , organic chemistry , quantum mechanics , layer (electronics) , computer science , engineering , thermodynamics
High‐power density and high durability are the main targets for solid oxide fuel cell (SOFC) development at Forschungszentrum Jülich. Power density has been further increased by variation of the material composition of perovskite‐based cathodes (Sr content, Co content, substoichiometry) and by optimization of the diffusion barrier (Gd‐substituted ceria) between an electrolyte and a cathode. The application of dense diffusion barrier layers significantly improved the performance. The associated avoidance of SrZrO 3 formation, however, contributed only to a small extent to the improvement of durability of SOFCs with LSCF cathodes. The redox stability of anode‐supported SOFCs has been addressed in two ways: (a) conventional Ni/yttria‐stabilized zirconia anode substrates have been investigated to explore the limits of re‐oxidation and to determine the degree of oxidation at which no damages occur. (b) Alternative anodes and anode substrates are under development, which basically consist of mixed‐conducting ceramics. Avoiding the high amount of nickel decreases the probability of failure, but does not automatically lead to redox‐stable anodes. The differences in the materials' properties of such ceramics in oxidizing and reducing environment are addressed.