Structural Features and Transport Properties of La(Sr)Fe 1-x Ni x O 3-δ – Ce 0.9 Gd 0.1 O 2-δ Nanocomposites—Advanced Materials for IT SOFC Cathodes
2013; Taylor & Francis; Volume: 34; Issue: 11-12 Linguagem: Inglês
10.1080/01457632.2012.752685
ISSN1521-0537
AutoresSvetlana Pavlova, Tamara Kharlamova, Vladіslav Sadykov, Tamara Krieger, V. S. Muzykantov, Yulia Bespalko, А. В. Ищенко, Vladimir A. Rogov, V. D. Belyaev, Yury Okhlupin, Н. Ф. Уваров, Alevtina Smirnova,
Tópico(s)Magnetic and transport properties of perovskites and related materials
ResumoMixed ionic−electronic conducting nanocomposites comprising complex oxides - perovskite (lanthanum-strontium nickelate-ferrite [LSFN]) and gadolinium-doped ceria (GDC) 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, ultraviolet–visible (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 a button-size cell with functionally graded LSFN0.4–GDC cathode layer supported on a thin YSZ layer covering Ni/YSZ cermet has demonstrated high and stable performance, promising for the practical application in the intermediate temperature range.
Referência(s)