Oxygen mobility and surface reactivity of PrNi1−xCoxO3+δ–Ce0.9Y0.1O2−δ cathode nanocomposites
| Autor: | A.S. Ulihin, E.M. Sadovskaya, Vladimir Pelipenko, A. V. Ishchenko, Vladimir A. Rogov, Galina Alikina, N. F. Uvarov, Vladislav A. Sadykov, Izaak C. Vinke, V. S. Muzykantov, Vladimir Ivanov, J. Mertens, Tamara Krieger, Yu. S. Okhlupin, A.S. Bobin, N.F. Eremeev, Vladimir Belyaev |
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| Jazyk: | angličtina |
| Rok vydání: | 2014 |
| Předmět: |
Materials science
Praseodymium Diffusion Non-blocking I/O Inorganic chemistry Analytical chemistry chemistry.chemical_element Sintering 02 engineering and technology General Chemistry 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences Oxygen 0104 chemical sciences Secondary ion mass spectrometry chemistry General Materials Science Reactivity (chemistry) 0210 nano-technology Perovskite (structure) |
| Zdroj: | Solid State Ionics |
| ISSN: | 0167-2738 |
| DOI: | 10.1016/j.ssi.2014.01.020 |
| Popis: | Cobalt-doped praseodymium nickelate PrNi 1 − x Co x O 3 − δ (PNC x ) and Y-doped ceria Ce 0.9 Y 0.1 O 2 − δ (YDC) oxides were synthesized via Pechini route. PNC x + YDC composites were prepared via ultrasonic dispersion of the mixture of perovskite and fluorite nanopowders in isopropanol with addition of polyvinyl butyral followed by drying, pressing and sintering at 1300 °C. The oxygen mobility and reactivity of powdered PNC x and composites obtained by crushing and milling of dense pellets were estimated by O 2 -TPD and oxygen isotope exchange with 18 O 2 and C 18 O 2 using both static and flow (SSITKA) reactors in isothermal and temperature-programmed (TPIE) modes. For PNC x samples sintered at 1300 °C comprised of (Ni,Co)O and Ruddlesden–Popper type phases (Pr 2 NiO 4 , Pr 4 (Ni,Co) 3 O 10 ), the oxygen mobility and reactivity tend to decrease with Co content. For composites, the oxygen mobility is much higher due to Pr transfer into YDC thus disordering perovskite-like and fluorite-like phases. TPIE C 18 O 2 SSITKA experiments combined with SIMS analysis of the depth profiles of Pr 18 O and Ce 18 O suggest that fast oxygen diffusion in composites is provided by domains of disordered perovskite-like phases as well as Pr,Y-doped ceria. For best composites, the value of the oxygen chemical diffusion coefficient estimated by the weight relaxation technique exceeds that of well known LSFC–GDC composite. |
| Databáze: | OpenAIRE |
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