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Труды Института высокотемпературной электрохимии УрО РАН
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Труды сотрудников Института горного дела УрО РАН
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Труды сотрудников ЦНБ УрО РАН
Публикации Черешнева В.А.
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Каталог библиотеки ИЭРиЖ УрО РАН
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1.

Вид документа :
Шифр издания : 54/S 19
Автор(ы) : Samgin A. L.
Заглавие : Lattice-assisted proton hopping in oxides at low temperatures
Место публикации : Journal of Physics and Chemistry of Solids. - 2013. - Vol. 74, № 12. - С. 1661-1668.
Примечания : Библиогр.: с. 1668 (44 ref.)
ББК : 54
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
Ключевые слова (''Своб.индексиров.''): электроосаждение--рафинирование--сплавы
Аннотация: Stimulated diffusion of protons in oxides such as ABO3 crystals and rutile TiO2 is discussed in the context of quantum Brownian motion. A self-consistent lattice-assisted proton hopping (LAPH) model is developed by going from white noise (characteristic of the standard stochastic theory of superionic conduction) to colored noise in the Markovian limit. This model differs from the commonly used ion jump models in that the hydrogen diffusion rate prefactor is identified as a quantity proportional to the frequency of phonon assistance. Application of the quantum fluctuation–dissipation theorem suggests that the dynamic activation energy for diffusion is a function of a bath-mode frequency. The LAPH model can predict enhanced rates of barrier jumping at room temperature compared to thermally activated proton diffusion. This indicates that low-temperature solid oxide devices are potential candidates for use in hydrogen energy research. The LAPH model offers a valid explanation for the mechanism of high protonic mobility recently observed for TiO2 in a picosecond transient pump-probe experiment. This unexpected dominant lattice relaxation channel must be considered as a new classical-like (but low-temperature) proton transfer mechanism. For vibration-assisted protonic jumps to occur at low temperature, the phonon assistance must be classified as a low-frequency vibration specific to each lattice
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2.

Вид документа : Статья из журнала
Шифр издания : 54/E 43
Автор(ы) : Murashkina A., Maragou V., Medvedev D., Sergeeva V., Demin A. K., Tsiakaras P.
Заглавие : Electrochemical properties of ceramic membranes based on SrTi0.5Fe0.5O3−δ in reduced atmosphere
Место публикации : International Journal of Hydrogen Energy. - 2012. - Vol. 37, № 19. - С. 14569-14575. - ISSN 03060-3199. - ISSN 03060-3199
Примечания : Bibliogr. : p. 14675 (23 ref.)
ББК : 54
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
Ключевые слова (''Своб.индексиров.''): температура --свойства--сопротивление электронное
Аннотация: The present work aims at the investigation of the electrochemical properties of SrTi0.5Fe0.5O3−δ as a membrane material for hydrogen production via electrochemical reforming. The dependence of the electrical conductivity on the oxygen partial pressure, as well as the oxygen permeability in the range of 10−20 atm ≤ ≤ 10−14 atm is examined. The oxygen permeability is measured by an electrochemical method. The dependences of ion current as a function of the electromotive force (EMF) at various temperatures, oxygen partial pressures and the membrane surface conditions (rough and activated by PrOx) are studied. Finally, the values of hydrogen flux at different temperatures are calculated and a long term investigation during 600 h at = 10−19 atm, T = 1173 K is carried out. According to the present results, the permeation current increases with the increase of temperature, oxygen partial pressure gradient and activation by PrOx. The long term investigation shows that the electrical resistance of the SrTi0.5Fe0.5O3−δ ceramic membrane increases by 10%, possibly due to the formation of micro-domains into the material's volume and the decrease in the grain boundary conductivity, because of the segregation of dopant-rich layers near the grain boundaries.
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3.

Вид документа : Статья из журнала
Шифр издания : 54/T 44
Автор(ы) : Pikalova E. Yu., Demina A. N., Demin A. K., Maragou V. I., Tsiakaras P. E.
Заглавие : The effect of co-dopant addition on the properties of LN0.2CE0.8O2-δ (LN = GD, SM, LA) solid-state electrolyte
Место публикации : Journal of Power Sources. - 2008. - Vol. 181, № 2. - С. 199-206.
УДК : 54
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
Ключевые слова (''Своб.индексиров.''): электропроводность--щелочноземельные металлы--легирование
Аннотация: The present work aims at the investigation of Ln0.2Ce0.8O2−δ (where Ln = Sm, La, Gd) structural and electrical properties when in the Ln sub-lattice, Ba2+ and Sr2+ with ionic radii 1.42 and 1.26 Å, respectively, are introduced. The conductivity measurements were held both in air and in H2 + 3%H2O atmosphere using the 4-probe dc technique at the temperature range of 600–900 °C. Among all the samples, the highest value of electrical conductivity is obtained in the case of (Sm0.75Sr0.2Ba0.05)0.2Ce0.8O2−δ, both in air and in hydrogen atmosphere. In the case of H2 + 3%H2O the conductivity of the co-doped compounds increases in comparison with air. Moreover, the dependence of conductivity on the oxygen partial pressure, measured at the range of 0.21–10−22 atm, showed that the electrolytic area of alkaline-earth metals doped Ln0.2Ce0.8O2−δ is considerably enhanced, as predicted by the theory. Finally, by comparing the thermal expansion coefficients of the different materials (TEC), the thermo-mechanical compatibility between the co-doped and the other cell components was also investigated.
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4.

Вид документа : Статья из журнала
Шифр издания : 54/E 43
Автор(ы) : Fadeyev G., Kalakin A., Demin A., Volkov A., Brouzgou A., Tsiakaras P.
Заглавие : Electrodes for solid electrolyte sensors for the measurement of CO and H2 content in air
Место публикации : International Journal of Hydrogen Energy. - 2013. - Vol. 38, № 30. - С. 13484-13490.
ББК : 54
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
Ключевые слова (''Своб.индексиров.''): электрод--твердые электролиты
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5.

Вид документа : Статья из журнала
Шифр издания : 54/I-70
Автор(ы) : Medvedev D., Maragou V., Zhuravleva T., Demin A., Gorbova E., Tsiakaras P.
Заглавие : Investigation of the structural and electrical properties of Co-doped BaCe0.9Gd0.1O3 - дельта
Место публикации : Solid State Ionics. - 2011. - Vol. 182, № 1. - С. 41-46. - ISSN 0167-2738. - ISSN 0167-2738
Примечания : Bibliogr. : p. 45-46 (43 ref.)
ББК : 54
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
Аннотация: In the present work the effect of cobalt oxide addition on the density and on the electrical properties of gadolinium-doped barium cerate is investigated. A series of BaCe0.9 б xGd0.1CoxO3 б б (x = 0.00, 0.01, 0.03, 0.05, 0.07, 0.10) samples were prepared according to the conventional solid state reaction synthesis technique. The experimental results indicated that the addition of cobalt oxide leads to the improvement of the sintering properties and the enhancement of the grain dimensions. It was found that the investigated complex oxides crystallize at cubic singony. Moreover, according to the X-ray diffraction (XRD) and the scanning electron microscopy (SEM) analyses, the prepared samples are single-phase in the range of 0.00 x б 0.10, while at compositions of x б 0.03 there is almost no open porosity. According to the four-probe dc electrical conductivity measurements, the conductivity of the BaCe0.9 б xGd0.1CoxO3 б б samples is inferior to the undoped ones (BaCe0.9Gd0.1O3 б б—BCG) in wet air atmosphere. However, the presence of Co in the range of 0.03 б x б 0.10 at higher temperatures (800–900 °C) has smaller impact on the electrical conductivity values. Finally, in wet hydrogen atmosphere the electrical conductivity values of the 1 mol% Co-doped sample were found to be close enough to the ones of the undoped sample, leading to the conclusion that cobalt can be effectively employed as a sintering additive of gadolinium-doped barium cerates.
\\\\Cserver\\dist\\НБО\\Cтатьи БД ИВТЭ\\Solid State Ionics\\SSI2011 V.182, N 1. - P.41-46.pdf
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6.

Вид документа : Статья из журнала
Шифр издания : 54/S 54
Автор(ы) : Shkerin S., Primdahl S., Mogensen M.
Заглавие : Polarisation resistance of the O2, Au/O2- and H2-H2O, Au/O2- electrode system
Место публикации : Ionics. - 2003. - Vol. 9, № 1-2. - С. 140-150.
ББК : 54
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
Аннотация: Gold electrodes with known contact geometries were studied using impedance spectroscopy. From these data it was possible to determine the specific polarisation conductivity per unit length of three-phase boundary (TPB). The values were found to be (3-22)x10-4 S·cm-1 dependent on the electrode history in pure oxygen at 977 °C and 2x10-6 S·cm-1 at 977 °C in “pure” hydrogen (PO2=10-20 atm at 1001 °C). The results are compared with previous data obtained for platinum electrodes.
\\\\Cserver\\dist\\НБО\\Cтатьи БД ИВТЭ\\Ionics\\2003, V. 9, № 1-2, С. 140-150.pdf
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7.

Вид документа : Статья из журнала
Шифр издания : 54/F 96
Автор(ы) : Douvartzides S. L., Coutelieris F. A., Demin A. K., Tsiakaras P.
Заглавие : Fuel options for solid oxide fuell cells: a thermodynamic analysis
Место публикации : AIChE Journal. - 2003. - Vol. 49, № 1. - С. 248-257.
ББК : 54
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
Аннотация: The eligibility of natural gas (methane), methanol, ethanol, and gasoline as fuels for the generation of electrical power in solid oxide fuel cells (SOFCs) is discussed in terms of efficiency. Each raw fuel was assumed to be processed in a steam reformer to provide a hydrogen-rich gas mixture to the SOFC feedstream. An SOFC system, consisting of an electrochemical section and a reformer, was analyzed thermodynamically assuming initial steam/fuel feed ratios at conditions where carbon deposition is thermodynamically impossible, at atmospheric total pressure, and in the temperature range of 800-1,200 K. Results were obtained in terms of both electromotive force (emf) output and efficiency. Methane seems to be the most appropriate fuel option, with an SOFC system efficiency close to 96%. Furthermore, ethanol and methanol were very promising alternative options (94% and 91%, respectively), while gasoline (83%) utilization requires special reforming conditions.
\\\\Cserver\\dist\\НБО\\Cтатьи БД ИВТЭ\\AIChE Journal\\2003, V. 49, № 1, С. 248-257.pdf
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8.

Вид документа : Статья из журнала
Шифр издания : 54/T 89
Автор(ы) : Tsidilkovski V. I., Gorelov V. P., Balakireva V. B.
Заглавие : Thermoelectric power of proton conducting oxides
Место публикации : Solid State Ionics. - 2003. - Vol. 162-163. - С. 55-61.
ББК : 54
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
Аннотация: A theory of thermopower for proton conducting oxides (PCO) with protons, oxide ions and different electron charge carriers has been developed. The thermopower альфа of SrCe0.95Y0.05O3 дельта, BaCe0.9Nd0.1O3 дельта and of a zirconium–yttrium electrolyte as a reference material was measured in both oxidizing and reducing atmospheres. The analysis of the data obtained for the region of pure protonic conduction of SrCe0.95Y0.05O3 дельта using our theoretical results and including vibrational and configurational contributions to альфа allowed determining both the partial entropy of protons and their heat of transport. The concentrations of protons and their temperature dependences determined from the entropy term agreed well with the experimental data available from hydrogen uptake studies.
\\\\Cserver\\dist\\НБО\\Cтатьи БД ИВТЭ\\Solid State Ionics\\2003, V. 162-163, С. 55-61.pdf
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9.

Вид документа : Статья из журнала
Шифр издания : 54/T 89
Автор(ы) : Tsidilkovski V. I.
Заглавие : Thermodynamic isotope effect H/D/T in proton-conducting oxides
Место публикации : Solid State Ionics. - 2003. - Vol. 162-163. - С. 47-53.
ББК : 54
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
Аннотация: The thermodynamic isotope effect H/D/T for proton conducting oxides in equilibrium with gas phase was theoretically considered. The difference in concentrations n of hydrogen, deuterium and tritium in the same samples exposed to gas phases containing the vapors of only one of these elements was analyzed. The oxides of the AIIB1-xIVRxIIIO3-y type were considered in the frame of some known defect formation models. It was shown that for a characteristic change in the proton-associated vibration frequencies with isotopic substitution of protons, the concentrations nH, nD and nT, under equivalent external conditions, might be appreciably different. The effect essentially depends on the external conditions and on the ratio of nH to dopant concentration x: it is maximal at low nH and disappears when nH/x1. A possibility of direct experimental observation of the thermodynamic isotope effect in perovskite oxides is briefly discussed.????
\\\\Cserver\\dist\\НБО\\Cтатьи БД ИВТЭ\\Solid State Ionics\\2003, V. 162-163, С. 47-53.pdf
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10.

Вид документа : Статья из журнала
Шифр издания : 54/D 48
Автор(ы) : Vykhodets V. B., Kurennykh T. E. , Nefedova O. A., Gorelov V. P., Stroeva A. Yu., Balakireva V. B., Vykhodets E. V., Obukhov S. I.
Заглавие : Deuterium diffusion in proton conductors La0.9Sr0.1ScO3 -δ and BaZr0.9Y0.1O3 -δ at room temperature
Место публикации : Solid State Ionics. - 2014. - С. P. 152-156.
Примечания : Bibliogr. : p. 156 (15 ref.)
ББК : 54
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
Ключевые слова (''Своб.индексиров.''): коэффициент активности кислорода--протонные проводники--пар
Аннотация: Room-temperature measurements of diffusion coefficients for deuterium in proton conductors La0.9Sr0.1ScO3 -δ and BaZr0.9Y0.1O3 -δ which contain dissolved H2O vapor have been performed. The concentration of oxygen structure vacancies in oxides after treatment in vapor was close to zero. A diffusion source of deuterium was created by ion implantation; measurement of the concentration–distance distribution of deuterium in samples was performed in situ during implantation. The NRA technique and 2H(d,p)3H reaction at an energy of the incident beam of 650 keV were used. For the initial and boundary conditions of the diffusion problem which were realized in the work, a solution of the inhomogeneous Fick equation was obtained. Using the technique developed, measurements of the diffusion coefficients for hydrogen in proton conductors were for the first time performed directly. For the BaZr0.9Y0.1O3 -δ oxide, the directly gained values of diffusion coefficients agree rather well with those obtained from the proton conductivity with the use of Nernst–Einstein equation
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11.

Вид документа : Статья из журнала
Шифр издания : 54/E 99
Автор(ы) : Ezin A. N., Samgin A. L.
Заглавие : Theoretical underpinnings of a method of reduction of operating temperature of solid oxide fuel cells under resonant light irradiation
Место публикации : International Journal of Hydrogen Energy. - 2015. - Vol. 40, № 29. - С. 8948-8957
Примечания : Bibliogr. : p. 8956-8957 (34 ref.)
ББК : 54
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
Ключевые слова (''Своб.индексиров.''): топливные элементы--перенос протонный
Аннотация: This study examines potential benefits of adopting ultrashort optical pulses in fuel cell technology. General principles for jumping migration of protons in resonant laser fields have been elaborated. We find that, depending upon the frequency of phonon assistance, the effective activation energy for migration can be strongly diminished when excitation pulses are used. The obtained results indicate that at room temperature the picosecond-laser-induced proton transfer in rutile type oxides is much faster than that for thermal activation. Our estimates are in good agreement with time-resolved measurements for rutile samples excited by infrared light. The fundamentals of this transfer process are briefly analyzed in the light of structure diffusion and vibrational mode models. The most important conclusion to emerge from our work is that the use of the optical stimulation shows considerable promise as a means for decreasing the operating temperature of solid oxide fuel cells based on proton hopping transport.
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12.

Вид документа : Статья из журнала
Шифр издания : 54/H 99
Автор(ы) : Vykhodets E. V., Kurennykh T. E. , Obukhov S. I., Gorelov V. P., Balakireva V. B., Vykhodets E. V.
Заглавие : Hydrogen isotope exchange in proton-conducting oxides during proton and deuteron irradiation
Место публикации : Journal of Experimental and Theoretical Physics Letters (Jetp Letters). - 2013. - Vol. 97, № 11. - 624-627
ББК : 54
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
Ключевые слова (''Своб.индексиров.''): водород--протонная проводимость
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13.

Вид документа : Статья из журнала
Шифр издания : 54/C 47
Автор(ы) : Ananyev M. V., Bronin D. I., Osinkin D. A., Eremin V. A., Steinberger-Wilckens R., De Haart L. G. J., Mertens J.
Заглавие : Characterization of Ni-cermet degradation phenomena I. Long term resistivity monitoring, image processing and X-ray fluorescence analysis
Цена : Б.ц.
ББК : 54
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
Ключевые слова (''Своб.индексиров.''): пористость--удельное сопротивление--оксид иттрия--оксид циркония
Аннотация: The present paper is devoted to Ni-cermet degradation phenomena and places emphasis on experimental approaches and data handling. The resistivity of Ni-YSZ cermet (nickel and 8 mol.% yttria stabilized zirconia) anode substrates was monitored during 3000 h at 700 and 800 °C in a gas mixture of 80 vol.% water vapor and 20 vol.% hydrogen. The experimentally evaluated dependence of resistivity of the Ni-YSZ substrates can be well described by exponential decay functions. Post test analysis by image processing and XRF (X-ray fluorescence) analysis for characterization of the microstructure and elemental composition were carried out for virgin samples and after 300, 1000 and 3000 h of exposure time. The 3D-microstructure was reconstructed using an original spheres packing algorithm. Two processes leading to the Ni-YSZ degradation were observed: Ni-phase particle coarsening and volatilization. The effect of these processes on resistivity and such microstructure parameters as porosity, Ni-phase fraction, Ni and YSZ phases particle size distributions, triple phase boundary length, and tortuosity factor are considered in this paper.
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14.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Osinkin D. A., Bogdanovich N. M., Beresnev S. M., Zhuravlev V. D.
Заглавие : High-performance anode-supported solid oxide fuel cell with impregnated electrodes
Место публикации : Journal of Power Sources. - 2015. - Vol. 288. - С. 20-25
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
Ключевые слова (''Своб.индексиров.''): тотэ--пропитка--синтез горения--сео2
Аннотация: The 61%NiO + 39%Zr0.84Y0.16O1.92 (NiO-YSZ) and 56%NiO + 44%Zr0.83Sc0.16Ce0.01O1.92 (NiO-CeSSZ) composite powders have been prepared using two-steps and one-step combustion synthesis, respectively. The Ni-YSZ anode substrate with a low level of electrical resistance (less than 1 mOhm cm) and porosity of about 53% in the reduced state was fabricated. The functional layer of the anode with the high level of electrochemical activity was made of NiO-CeSSZ. The single anode-supported solid oxide fuel cell with the bi-layer Ni-cermet anode, Zr0.84Sc0.16O1.92 film electrolyte and the Pt + 3% Zr0.84Y0.16O1.92 cathode was fabricated. The power density and the U–I curves of the fuel cell at initial state and after impregnation of the cathode and anode by praseodymium and cerium oxides, respectively, have been measured at different temperatures. The maximum of power density of the initial fuel cell was 0.35 W cm−2 at conditions of wet hydrogen (air) supply to the anode (cathode) at 900 °C. After the electrodes were impregnated, the value of power density increased by seven times and was approximately 2.4 W cm−2 at 0.6 V. It was suggested that after the electrodes impregnation the polarization resistance of the fuel cell was determined by the gas diffusion in the supported anode.
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15.

Вид документа :
Шифр издания : 54/O-97
Автор(ы) : Rakhmanov E. V., Tarakanova A. V., Valieva T., Litvinova V. V., Maksimov A. L., Anisimov A. A., Vakarin S. V., Semerikova O. L., Zaikov Yu. P.
Заглавие : Oxidative desulfurization of diesel fraction with hydrogen peroxide in the presence of catalysts based on transition metals
Место публикации : Petroleum Chemistry. - 2014. - Vol. 54, № 1. - С. 48-50
ББК : 54
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
Ключевые слова (''Своб.индексиров.''): вольфрамат молибдата--бензотиофен
Аннотация: The oxidative desulfurization of a straight-run, nonhydrotreated diesel fraction (boiling range 178–342°C) containing benzothiophene, dibenzothiophene, their alkyl-substituted derivatives, and thioxanthene by the action of hydrogen peroxide in the presence of transition metal compounds (Na2MoO4, Na2WO4, NaVO3, WO3, tungstic acid, and heteropoly tungstate/molybdate H3PMo6W6O40) in a biphasic system followed by the extraction of the oxidation products with dimethylformamide has been studied. The oxidation of the hydrocarbon fraction in the presence of heteropoly tungstate/molybdate under biphasic conditions provides for the removal of up to 82% of total sulfur.
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16.

Вид документа :
Шифр издания : 54/A 67
Автор(ы) : Kalyakin A., Fadeyev G., Demin A., Gorbova E., Brouzgou A., Volkov A., Tsiakaras P.
Заглавие : Application of Solid oxide proton-conducting electrolytes for amperometric analysis of hydrogen in H2+N2+H2O gas mixtures
Место публикации : Electrochimica Acta. - 2014. - Vol. 141. - С. .120-125.
Примечания : Bibliogr. : p. 125 (41 ref.)
ББК : 54
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
Ключевые слова (''Своб.индексиров.''): твердые электролиты--водород--датчики
Аннотация: Amperometric hydrogen sensors based on proton-conducting solid electrolytes of La0.95Sr0.05YO3, CaTi0.95Sc0.05O3 and CaZr0,9Sc0.1O3 compositions are prepared and investigated in the present work. The influence of the sensor design on its own characteristics is also examined. It is shown that a solid electrolyte used in the form of discs with cavities significantly simplifies the design of this type of sensors. A sensor based on La0.95Sr0.05YO3 electrolyte with fully sealed junction between discs is suitable for the analysis of mixtures with high H2 content. It is found that by increasing H2 content from 10 to 98% the limiting current increases from 0.25 to 2.25 mA (at 750 mV). It is also found that the sensor based on La0.95Sr0.05YO3 with discs sealed in two points as well as the sensor based on CaZr0,9Sc0.1O3 with fully sealed junction are suitable for the analysis of mixtures with low H2 content (0.5-2%). For the above cases, the limiting current at 2% H2 reaches 3.5 and 0.5 mA (at 750 mV), respectively. CaTi0.95Sc0.05O3 is not suitable to be used as a hydrogen sensor. In all the examined systems, steam content does not affect sensors’ behavior and high operating temperatures (850 °C) increase the range of sensors’ hydrogen measuring concentration capacity.
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17.

Вид документа :
Шифр издания : 54/H 99
Автор(ы) : Murashkina A. , Pikalova E. , Medvedev D. , Demin A., Tsiakaras P.
Заглавие : Hydrogen production aided by new (1−x)SrTi0.5Fe0.5O3–δ–xCe0.8(Sm0.8Sr0.2)0.2O2–δ (MIEC) composite membranes
Место публикации : International Journal of Hydrogen Energy. - 2014. - Vol. 39, № 24. - С. P. 12472-12479
ББК : 54
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
Ключевые слова (''Своб.индексиров.''): композиционные материалы--производство кислорода--амбиполярная проводимость--проницаемость кислорода
Аннотация: In the present work, composite materials of the type (1–x)SrTi0.5Fe0.5O3–δ–xCe0.8(Sm0.8Sr0.2)0.2O2–δ (with х = 0, 0.25, 0.5, 0.75 and 1) are obtained by the two step solid state technique. Their transport properties are investigated in terms of their usage as mixed ionic-electronic conducting (MIEC) membrane materials for hydrogen production. It is found that, in reducing conditions the composites are characterized by mixed conductivity, which level is controlled by the electrical properties of the prevailing phase. Moreover, at 900 °C and pO2 = 10−18 atm, total conductivity, ambipolar conductivity and oxygen permeability of composites dramatically grow (each of about 500%), when the fluorite component content x increases from 0 to 1. High-conducting and strengthened material 0.5SrTi0.5Fe0.5O3–δ–0.5Ce0.8(Sm0.8Sr0.2)0.2O2–δ is chosen for making tube shaped membranes using the tape rolling method, which are successfully applied for hydrogen production in laboratory scale. The hydrogen flux reached 0.176 ml cm−2 min−1 for x = 1, T = 900 °C and emf = 10 mV.
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18.

Вид документа :
Шифр издания : 54/C 74
Автор(ы) : Medvedev D. A. , Gorbova E. V., Demin A. K., Tsiakaras P.
Заглавие : Conductivity of Gd-doped BaCeO3 protonic conductor in Н2–Н2О–О2 atmospheres
Место публикации : International Journal of Hydrogen Energy. - 2014. - Vol. 39, № 36. - С. 21547-21552
Примечания : Bibliogr. : p. 21551-21552 (31 ref.)
ББК : 54
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
Ключевые слова (''Своб.индексиров.''): проводимость ионная--проводимость протонная--материалы керамические--твердые электролиты
Аннотация: In the present investigation, a radically new and simple method of evaluation of the proton conductivity is proposed. This method is based on the conductivity measurement of ceramic materials depending on the oxygen partial pressure (pO2) at a gradual transition from the atmosphere of pure oxygen to one of wet hydrogen: O2 → O2 (H2O) → H2O (O2) → H2O → H2O (H2) → H2 (H2O). Experimental data of total conductivities for the solid electrolyte BaCe0.9Gd0.1O3–δ (BCG) have been fitted with modeling ones in accordance with the defect chemistry model at 600, 750 and 900 °C. Experimental and theoretical relationships correlate well with each other, demonstrating the success of the proposed model description. Analysis of dependences of the total conductivity as a function of pO2 with simultaneous change of pO2 and water partial pressure (pH2O) allows the estimation of the contribution of the partial conductivities (protonic, oxygen ionic, electronic) in the total one and the identification of the areas of purely ionic and purely protonic conductivity. Using the obtained data, some transport phenomena of proton-conducting materials, which were not previously interpreted, are discussed.
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19.

Вид документа : Статья из журнала
Шифр издания : 54/E 43
Автор(ы) : Dunyushkina L. A., Smirnov S. V., Kuimov V. M., Gorelov V. P.
Заглавие : Electrical conductivity of CaZr0.9Y0.1O3−δ films deposited from liquid solutions
Место публикации : International Journal of Hydrogen Energy. - 2014. - Vol. 39, № 32. - С. 18385-18391
ББК : 54
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
Ключевые слова (''Своб.индексиров.''): осаждение химическое --твердость пленки--проводимость протонная
Аннотация: CaZr0.9Y0.1O3−δ (CZY) films were fabricated by chemical solution deposition (CSD) from ethanol-based liquid solutions. The films were deposited on single crystals of yttria-stabilized zirconia (YSZ) in (100), (110) and (111) crystallographic orientations. The structural, mechanical and electrical properties of the films have been studied by means of X-ray diffraction (XRD), scanning electron microscopy (SEM), and nanoindentation and impedance spectroscopy methods. XRD and SEM results have shown that the films were polycrystalline. Effect of the substrate orientation on the microstructural, mechanical and electrical properties of CZY films has been examined. The films deposited on (110)-substrates consist of the largest grains; show the highest values of hardness and electrical conductivity. Conductivity of CZY film on (110)-substrates increases with rise in humidity which proves proton transport in the films
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20.

Вид документа : Статья из журнала
Шифр издания : 54/E 43
Автор(ы) : Douvartzides S., Coutelieris F., Demin A., Tsiakaras P.
Заглавие : Electrisity from ethanol fed SOFCs: the expectations for sustainable development and technological benefits
Место публикации : International Journal of Hydrogen Energy. - 2004. - Vol. 29, № 4. - С. 375-379.
ББК : 54
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
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