A. P. Nemudry
Russian Academy of Sciences
Analytical chemistryConductivityKinetic energyKineticsPhase transitionPerovskite (structure)Inorganic chemistryChemistryMaterials scienceDiffractionIonic bondingOxygen permeabilityOxideOxygen transportMembraneChemical engineeringPermeationCobaltFiberOxygenTungstenDopingPartial pressureActivation energyThermodynamics
43Publications
8H-index
230Citations
Publications 43
Newest
#1Stanislav Chizhik (NSU: Novosibirsk State University)H-Index: 6
#2S. F. BychkovH-Index: 7
Last. A. P. NemudryH-Index: 8
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Abstract In order to determine the kinetic parameters of oxygen exchange between nonstoichiometric oxides and the gas phase, the rate constant of surface exchange k and the coefficient of bulk oxygen diffusion in the oxide D, one needs to model the kinetics of relaxation occurring under mixed diffusion-reaction control. It is shown that the widely used Crank model can misestimate the k and D values as it does not take into account such factors as (i) changes in oxygen partial pressure pO2 in the...
1 CitationsSource
#1Stanislav Chizhik (NSU: Novosibirsk State University)H-Index: 6
#2S. F. BychkovH-Index: 7
Last. A. P. NemudryH-Index: 8
view all 5 authors...
Perovskite related oxides ABO3−δ exhibiting mixed ionic–electronic conductivity (MIEC) possess large deviations from the oxygen stoichiometry. When providing excellent application potential, this feature also makes it very difficult to study the reaction mechanism between such oxides and molecular oxygen, also known as the oxygen reduction reaction. The complexity of the theoretical interpretation of kinetic experiments originates from the significant dependence of the kinetic and equilibrium pr...
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#1Artem BagishevH-Index: 1
#2A. I. TitkovH-Index: 7
Last. A. P. NemudryH-Index: 8
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#1S. V. Zazhigalov (NSU: Novosibirsk State University)H-Index: 3
#2M. P. Popov (NSU: Novosibirsk State University)H-Index: 5
Last. Andrey N ZagoruikoH-Index: 13
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This work is devoted to the mathematical modeling and experimental studies of electric-current generation during hydrogen oxidation in microtubular (MT) solid oxide fuel cells (SOFCs). The technology of manufacturing fuel cells and the experimental technique are described. A mathematical model is constructed that describes the occurrence of chemical reactions and diffusion and heat-transfer processes. When verifying the model using the example of hydrogen oxidation in a temperature range of 600–...
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#1Bogdan V. Voloshin (NSU: Novosibirsk State University)
#2V.A. Eremin (UrFU: Ural Federal University)
Last. A. P. NemudryH-Index: 8
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Abstract The work is related to the development of novel oxygen release technique to obtain continuous phase diagrams of oxides with mixed ionic-electronic conductivity. Promising perovskite-like composition Ba0.5Sr0.5(Co0.8Fe0.2)0.85Ta0.15O3-δ (BSCFT15) was chosen as a sample. As-prepared samples of BSCFT15 was studied by means of X-Ray diffraction analysis and scanning electron microscopy. Continuous equilibrium phase «3-δ – lg pO2 – T» diagram obtained by oxygen release technique is presented...
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Abstract We performed ab initio molecular dynamic simulations for SrCoMoO1-x and SrCo0.875Mo0.125O1-x (x = 0, 0.125, 0.25) compounds with VASP package. The Mo doping cause “contraction” of structure with lowering the volume of studied system and lowering the thermal expansion up to 2 times. Analysis of inner ionic motions showed that vacancies may move both to Co cation neighbor and Mo neighbor despite the Mo effective charge is about +2.6e but Co charge about +1.6e. The effective charges of ion...
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#1Artem Bagishev (NSU: Novosibirsk State University)H-Index: 1
#2Daniel V. Maslennikov (NSU: Novosibirsk State University)H-Index: 1
Last. A. P. NemudryH-Index: 8
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Abstract In this work, the method of co-firing was applied to obtain NiO/GDC – GDC half-cell for MT SOFC. Microtubular anode preforms of NiO/10GDC (60/40 wt%) composition were formed using the phase-inversion technique. The paste of electrolyte material 10GDC was deposited on the anode preforms by the dip-coating method. Some amount of lithium salts (3 wt%) were added into anode material and 10GDC paste, and their effect on the formation of the gas-tight electrolytic layer was investigated. The ...
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#1Ivan KovalevH-Index: 1
Last. A. P. NemudryH-Index: 8
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This article is devoted to the development of the direct resistive heating of oxygen transport membranes technique. In this case, DC was selected to perform direct heating. The effect of DC on the oxygen fluxes and the microstructure of the membrane was studied. It is shown that in the short-term experiment with DC, a positive significant effect on the oxygen transport was found, while sample exposure under the influence of DC for a long period of time had a significant negative effect on the mi...
1 CitationsSource
#1E.V. ShubnikovaH-Index: 1
#2M. P. PopovH-Index: 5
Last. A. P. NemudryH-Index: 8
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Abstract The paper presents a model of oxygen transport in oxygen-permeable hollow fiber membranes taking into account the gradual changes of oxygen partial pressure in flows of feed and sweep gases along the HF membrane. The model is based on fulfilling local mass balance conditions linking oxygen flows in feed and sweep gases with the oxygen flux through the membrane. Computer simulation of oxygen permeation data for hollow fiber membranes made from mixed ionic electronic conducting oxides (Ba...
6 CitationsSource
#1Stanislav Chizhik (NSU: Novosibirsk State University)H-Index: 6
#2S. F. BychkovH-Index: 7
Last. A. P. NemudryH-Index: 8
view all 4 authors...
Abstract The study of the oxygen exchange of mixed ionic electronic conducting oxides with the gas phase, which determines the efficiency of devices planned to be used in distributed power generation and industrial chemistry is complicated by the strong dependence of their properties on widely varying oxygen nonstoichiometry δ. A new fruitful approach, in which non-stoichiometric oxides are considered as continuous δ-homologous series proposed for solving this problem, requires the development o...
2 CitationsSource