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Design and Characterization of Functionally Graded Cathode Materials for Solid Oxide Fuel Cells

2009; Institute of Physics; Volume: 25; Issue: 2 Linguagem: Inglês

10.1149/1.3205794

2151-2051

Vladіslav Sadykov, Svetlana Pavlova, Valeria Zarubina, A. Bobin, G. M. Alikina, Anton I. Lukashevich, Vitalii Muzykantov, Vladimir Usoltsev, Tamara Kharlamova, А. И. Боронин, S.V. Koscheev, Tamara Krieger, А. В. Ищенко, Natalia Mezentseva, А. Н. Саланов, Alevtina Smirnova, Oleg Bobrenok, Н. Ф. Уваров,

Catalytic Processes in Materials Science

This work presents results on synthesis and characterization of mixed ionic-electronic conducting nanocomposite cathode materials for Intermediate Temperature Solid Oxide Fuel Cells. The corresponding materials are comprised of La0.8Sr0.2MnO3 (LSM) or La0.8Sr0.2Fe1-xNixO3-δ (x=0.1-0.4) (LSFNx) perovskites and Sc0.1Ce0.01Zr0.89O2-x (ScCeSZ) or Ce0.9Gd0.1O2-δ (GDC) fluorites mixed via powerful ultrasonic dispersion of powders in isopropanol. Genesis of their structural properties was studied in detail by transmission electron microscopy with elemental analysis and X-ray diffraction; surface features were characterized by X-ray Photoelectron Spectroscopy. Perovskite-fluorite nanodomain interfaces appear to provide a path for fast oxygen diffusion as revealed by the oxygen isotope exchange and temperatureprogrammed desorption. Testing in wet H2/air for button-size fuel cells with thin Y-doped zirconia layer and nanocomposite functionally graded cathodes demonstrated promising and stable performance in some combinations in the intermediate temperature range.