Browsing by Author "Vasylyev, O."

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    EB-PVD electrolyte for solid oxide fuel cells
    (Видавництво національнього університету „Львівська політехніка”, 2009) Brychevskyi, M.; Vasylyev, O.; Dubykivskyi, L.; Sameluk, A.
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    Fractal analysis of surface topography of solid oxide fuel cell materials
    (Видавництво Львівської політехніки, 2012) Suchaneck, G.; Ponomareva, A. A.; Brychevskyi, M.; Brodnikovskyi, I.; Vasylyev, O.; Gerlach, G.
    In this work, we investigate the hierarchical surface topography of solid oxide fuel cell electrolytes consisting of zirconia stabilized with 10% Sc2O3 and 1% CeO2 (1Ce10ScSZ) synthesized at 1300-1400 °C and anodes of 60 wt% 1Ce10ScSZ and 40 wt% NiO synthesized at 1250 to 1550 °C. The fractal dimension of AFM images of the films was determined by the cube counting method, the triangulation method and by means of the PSD slope at large wavenumbers. RMS roughness and correlation lengths were derived from the fit to the model PSD.
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    LSCF cathode materials for intermediate temperature solid oxide fuel cells
    (Видавництво національного університету „Львівська політехніка”, 2009) Ushkalov, L.; Vasylyev, O.; Pryschepa, Ye.; Samelyuk, A.; Melakh, V.
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    On nucleation and growth mechanisms of EBPVD zirconia films on porous NiO-ZrO2 substrate
    (Видавництво Львівської політехніки, 2012) Vasylyev, O.; Brychevskyi, M.; Brodnikovskyi, I.; Dubykivskyi, L.; Andrzejczuk, M.; Spychalski, M.; Lewandowska, M.; Kurzydłowski, K.; Steinberger-Wilckens, R.; Mertens, J.; Malzbender, J.
    Thin structure of the anode-electrolyte interface (AEI) was studied, and plausible nucleation and growth mechanisms at electron-beam physical vapor deposition (EB-PVD) were established. ZrO2 condensates with two mechanisms – planar and cellular ones like it happens at solidification from liquid phase. ZrO2 condensation on ZrO2 and NiO phases occurs with two different routes. On ZrO2 phase, layer of planar growth is formed with "defective layer by defective layer" mechanism. On NiO, the layer is cellular from the very beginning of the deposition process. The layer of planar growth is formed as "dense layer by dense layer". Deposition affected zone (DAZ) is clearly distinguished.
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    On the dependence of Ionic conductivity of ScSZ electrolytes on temperature of their sintering
    (Видавництво Львівської політехніки, 2012) Kyrpa, O.; Vasylyev, O.; Brychevs’kyi, M.; Pryshchepa, E.; Smirnova, A.
    The dependencies of ionic oxygen conductivity of 10Sc1CeSZ electrolytes made of different zirconia powders those differ by their impurities and production technologies, and sintered in air at different temperatures after uniaxial pressing are analyzed in terms of their Arrhenius equations in 400-900oC temperature range. Deviation from a typical linear dependence of conductivity on temperature that is the most clearly visible in the electrolyte made of the purest powder is observed as a kink on the temperature dependency. A position of the kink point is determined by powder properties and is practically independent on temperature of powder sintering.