Design and characterization of LSM/ScCeSZ nanocomposite as mixed ionic-electronic conducting material for functionally graded cathodes of solid oxide fuel cells

作者：Sadykov V^*; Alikina G; Lukashevich A; Muzykantov V; Usoltsev V; Boronin A; Koscheev S; Krieger T; Ishchenko A; Smirnova A; Bobrenok O; Uvarov N

来源：Solid State Ionics, 2011, 192(1): 540-546.

DOI：10.1016/j.ssi.2010.08.015

• Mixed ionic-electronic conducting composites
• Sr-doped lanthanum manganite
• Sc-Ce-doped zirconia
• Structure and surface properties
• Transport properties
• Cathodes of solid oxide fuel cells
• Performance

LSM/ScCeSZ nanocomposite was prepared via ultrasonic dispersion of the mixture of perovskite and fluorite powders in isopropanol in 1:1 ratio with addition of polyvinyl butyral. Studies of the real structure and surface property evolution at sintering under air up to 1100 degrees C revealed some redistribution of elements between the phases without new phase formation. Sizes of both phase domains remain in nanorange even in the dense material, thus providing a developed perovskite-fluorite interface. The surface layer of nanocomposite is enriched by LSM. The oxygen mobility and reactivity estimated by the oxygen isotope exchange and O-2 TPD exceed those for LSM suggesting a positive role of interfaces as fast oxygen migration paths. Button-cell tests with the LSM/ScCeSZ interlayer between LSNF and a thin ScYSZ layer covering Ni/YSZ cermet demonstrated a high and stable performance promising practical application promising for practical application.

• 出版日期2011-6-16