doi: 10.3850/978-981-08-7614-2_IMPRES023


Structural Features and Transport Properties of La(Sr)Fe1-xNixO3-δ – Ce0.9Gd0.1O2-δ Nanocomposites – Advanced Materials for it SOFC Cathodes


Svetlana Pavlova1,a, Tamara Kharlamova1, Vladislav Sadykov1, Tamara Krieger1, Vitaly Muzykantov1, Yulia Bespalko1, Arcady Ishchenko1, Vladimir Rogov1, Vladimir Belyaev1, Yury Okhlupin2 and Nikolai Uvarov2

1Boreskov Institute of Catalysis SB RAS, Novosibirsk, Russia.

pavlova@catalysis.ru

2Institute of Solid State Chemistry and Mechanochemistry of SB RAS, Russia

ABSTRACT

Mixed ionic-electronic conducting nanocomposites y wt.% La0.8Sr0.2Fe1-x.NixO3-δ (LSFNx)–(100-y) wt.% Ce0.9Gd0.1O2-δ (GDC) (x=0.1–0.4; y=30–100 wt.%) have been prepared via ultrasonic dispersion of nanocrystalline powders of LSFNx and GDC in organic solvent with addition of surfactant, followed by drying and sintering up to 1300°C. Their structural and surface properties have been studied by X-ray diffraction, UV-vis electron spectroscopy, transmission electron microscopy with elemental analysis and X-ray Photoelectron Spectroscopy. Results of impedance spectroscopy, oxygen isotope exchange, O2 temperature-programmed desorption, weight and conductivity relaxation experiments have revealed a strong positive effect of perovskite–fluorite nanodomain interfaces in composite on the oxygen mobility and reactivity. Testing in wet H2/air feeds for button-size cell with functionally graded LSFN0.3–GDC cathode layer supported on thin YSZ layer covering Ni/YSZ cermet has demonstrated high and stable performance promising for the practical application in the intermediate temperature range.

Keywords: Perovskite–fluorite nanocomposite, Structural and Transport properties, SOFC.


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