Ceramic nanocomposites based on oxides of transition metals for ionistors

Шилова, О. А.; Antipov, V. N.; Тихонов, П. А.; Kruchinina, I. Yu.; Arsent’ev, M. Yu.; Panova, T. I.; Морозова, Л. В.; Moskovskaya, V. V.; Калинина, М. В.; Tsvetkova, I. N.

doi:10.1134/s1087659613050179

Cited by 18 publications

(4 citation statements)

References 18 publications

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“…where Nd Ce is a neodymium ion replacing Ce 4+ and V ö is oxygen vacancy. The transfer numbers of ions and electrons in bulky solid electrolytes were determined by the West-Tallan method [19] using a CO 2 + CO mixture (corresponding to an oxygen partial pressure of 10 3 Pa) as an inert gas. The measurements were carried out using a direct current in weak (U = 0.5 V) fields after a long (up to 30 min) drop of the current.…”

Section: Characterization Methodsmentioning

confidence: 99%

“…The most preferable approaches to obtaining precursor powders for ceramics involve such liquid-phase methods as hydrothermal synthesis, the sol-gel method, Pechini method, the co-precipitation of hydroxides from solutions of inorganic salts, and the cocrystallization of salts. A particularly promising one is the co-precipitation of hydroxides followed by low-temperature treatment, providing a more precise adjustment of the dispersion and microstructure of the target products due to the variation of the synthesis conditions and obtaining single phase xerogels and powders with a required composition and high specific surface area [19][20][21].…”

Section: Introductionmentioning

confidence: 99%

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Effect of Synthetic Approaches and Sintering Additives upon Physicochemical and Electrophysical Properties of Solid Solutions in the System (CeO2)1−x(Nd2O3)x for Fuel Cell Electrolytes

et al. 2023

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Finely dispersed (CeO2)1−x(Nd2O3)x (x = 0.05, 0.10, 0.15, 0.20, 0.25) powders are synthesized via liquid-phase techniques based on the co-precipitation of hydroxides and co-crystallization of nitrates. The prepared powders are used to obtain ceramic materials comprising fluorite-like solid solutions with the coherent scattering region (CSR) of about 88 nm (upon annealing at 1300 °C) and open porosity in the range of 1–15%. The effect of the synthesis procedure and sintering additives (SiO2, ZnO) on physicochemical and electrophysical properties of the resulting ceramics is studied. The prepared materials are found to possess a predominantly ionic type of electric conductivity with ion transfer numbers ti = 0.96–0.71 in the temperature range of 300–700 °C. The conductivity in solid solutions follows a vacancy mechanism with σ700 °C = 0.48 × 10−2 S/cm. Physicochemical properties (density, open porosity, type and mechanism of electrical conductivity) of the obtained ceramic materials make them promising as solid oxide electrolytes for medium temperature fuel cells.

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Section: Characterization Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effect of Synthetic Approaches and Sintering Additives upon Physicochemical and Electrophysical Properties of Solid Solutions in the System (CeO2)1−x(Nd2O3)x for Fuel Cell Electrolytes

et al. 2023

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“…The electrical resistance of the obtained ceramic materials was measured by a twocontact method using a direct current in the temperature range of 250-1000 • C and using the "Hardware-software installation to investigate the electrical properties of nanoceramics in different gas media" [28]. The transfer numbers of the ions and electrons in bulky solid electrolytes were determined by the West-Tallan method [29] using a CO 2 + CO mixture (corresponding to the oxygen partial pressure of 10 3 Pa) as an inert gas.…”

Section: Characterization Methodsmentioning

confidence: 99%

Comparative Study of Physicochemical Properties of Finely Dispersed Powders and Ceramics in the Systems CeO2–Sm2O3 and CeO2–Nd2O3 as Electrolyte Materials for Medium Temperature Fuel Cells

et al. 2023

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Finely dispersed (CeO2)1−x(Sm2O3)x (x = 0.05, 0.10, 0.20) and (CeO2)1−x(Nd2O3)x (x = 0.05, 0.10, 0.15, 0.20, 0.25) powders were synthesized via liquid-phase techniques based on the co-precipitation of hydroxides and were used to obtain ceramic materials comprising fluorite-like solid solutions with CSR in the range 69–88 nm (upon annealing at 1300 °C) and open porosity in the range 0.6–6.2%. The physicochemical properties of the synthesized materials were comparatively characterized. In general, the prepared materials were found to possess a mixed type of electrical conductivity, but in the medium-temperature range, the ionic component was predominant (ion transfer numbers ti = 0.93–0.73 at 300–700 °C). The highest ionic conductivity was observed for CeO2-based samples containing 20 mol.% Sm2O3 (σ700°C = 3.3 × 10−2 S/cm) and 15 mol.% Nd2O3 (σ700°C = 0.48 × 10−2 S/cm) was in the temperature range 500–700 °C. The physicochemical properties (density, open porosity, type and mechanism of electrical conductivity) of the obtained ceramic materials make them promising as solid oxide electrolytes for medium temperature fuel cells.

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“…The open porosity of the samples was determined by hydrostatic weighing in distilled water in accordance with the Russian standard GOST 473.4-81 [15]. The electrical resistance of the obtained ceramic materials was measured by the two-contact method at a direct current in the temperature range of 250-1000°C using the "Hardwaresoftware complex for studying the electrical properties of nanoceramics in various gaseous media" [16].…”

Section: Characterization Techniquesmentioning

confidence: 99%

Synthesis and Investigation of Ceramic Materials for Medium-Temperature Solid Oxide Fuel Cells

Калинина¹,

Dyuskina²,

Polyakova³

et al. 2022

Smart and Advanced Ceramic Materials and Applications

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Finely dispersed (СeO2)1-x(Sm2O3)x (x = 0.02; 0.05; 0.10); La1-xSrxNiO3, La1-xSrxCoO3 and La1-xSrxFe0.7Ni0.3O3 (x = 0.30; 0.40) mesoporous xerogel powders are synthesized by co-crystallization of the corresponding nitrates with ultrasonic processing and used to obtain nanoscale ceramic materials with cubic fluorite-like, orthorhombic, and perovskite-like tetragonal crystal structure, respectively, with CSR ∼ 64–81 nm (1300°C). Physicochemical characterization of the obtained ceramics revealed that (СeO2)1-x(Sm2O3)x features with open porosity 2–6%, while for La1-xSrxNiO3, La1-xSrxCoO3, and La1-xSrxFe0.7Ni0.3O3, this value is about 21–29%. Ceria-based materials possess a predominantly ionic conductivity (ion transport numbers ti = 0.82–0.71 in the temperature range 300–700°C, σ700°С = 1.3·10−2 S/cm) determined by the formation of mobile oxygen vacancies upon heterovalent substitution of Sm3+ for Се4+. For solid solutions based on lanthanum nickelate and cobaltite, a mixed electronic-ionic conductivity (σ700°С = 0.80·10−1 S/cm) with ion transport numbers (te = 0.98–0.90, ti = 0.02–0.10) was obtained. The obtained ceramic materials are shown to be promising as solid oxide electrolytes and electrodes for medium-temperature fuel cells.

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Ceramic nanocomposites based on oxides of transition metals for ionistors

Cited by 18 publications

References 18 publications

Effect of Synthetic Approaches and Sintering Additives upon Physicochemical and Electrophysical Properties of Solid Solutions in the System (CeO2)1−x(Nd2O3)x for Fuel Cell Electrolytes

Effect of Synthetic Approaches and Sintering Additives upon Physicochemical and Electrophysical Properties of Solid Solutions in the System (CeO2)1−x(Nd2O3)x for Fuel Cell Electrolytes

Comparative Study of Physicochemical Properties of Finely Dispersed Powders and Ceramics in the Systems CeO2–Sm2O3 and CeO2–Nd2O3 as Electrolyte Materials for Medium Temperature Fuel Cells

Synthesis and Investigation of Ceramic Materials for Medium-Temperature Solid Oxide Fuel Cells

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