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10. Effect of Synthesis Conditions on the Physicochemical Properties of Xerogels, Nanopowders, and Ceramic Materials in the CeO2–Nd2O3 System.

Author

Kalinina, M. V., Dyuskina, D. A., Khamova, T. V., Yefimova, L. N., Kruchinina, I. Yu., and Shilova, O. A.

Abstract

Abstract—Highly dispersed mesoporous powders of the CeO2)1 – x(Nd2O3)x (х = 0.05, 0.10, 0.15, 0.20, 0.25) composition are synthesized by liquid methods such as coprecipitation of hydroxides and cocrystallization of nitrate salts. The powders have a specific pore volume of 0.030–0.111 cm3/g and a specific surface area of 7.40–119.26 m2/g. On their basis, ceramic nanomaterials of a given composition with CSR ~ 69–88 nm (1300°С) are obtained. The physicochemical properties of the resulting ceramic have been studied; it is revealed that it is a solid solution with open porosity in the range of 17–30% and high values of relative density of 89–96%. In terms of their physicochemical properties (density, thermal expansion coefficient), the resulting ceramic materials are promising as solid oxide electrolytes for intermediate-temperature fuel cells. [ABSTRACT FROM AUTHOR]

Published
2024
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11. Synthesis and Research of Electrolyte and Electrode Materials in CeO2–Nd2O3 and Gd2O3–La2O3–SrO–Ni(Co)2O3 – δ Systems for Medium-Temperature Fuel Cells

Author

Kalinina, M. V., Polyakova, I. G., Myakin, S. V., Khamova, T. V., Efimova, L. N., and Kruchinina, I. Yu.

Subjects
FUEL cell electrodes, FUEL cells, CERAMIC materials, ELECTRIC conductivity, SOLID oxide fuel cells, ELECTROLYTES, PROTON exchange membrane fuel cells, POWDERS, CERAMICS
Abstract

Using the method of the joint crystallization of solutions of nitrate salts with ultrasonic treatment, xerogels and highly dispersed mesoporous powders of the following composition are synthesized: (CeO2)1 – x(Nd2O3)x (x = 0.02; 0.05; 0.10), Gd1 – xSrxCo0.5O3 – δ (x = 0.1, 0.15, 0.2, 0, 25), Gd0.4Sr0.1Ni0.5O3 – δ, and Gd0.125La0.125Sr0.25Co0.5O3 – δ; and based on them, nanoceramic materials with a crystalline cubic structure of the fluorite type, as well as an orthorhombic and tetragonal structure of the perovskite type with CSR ~ 55–90 nm (1300°С), respectively, are obtained. The physicochemical properties of the resulting ceramics are studied; it is revealed that it has an open porosity of 7–11% for the composition (CeO2)1 – x(Nd2O3)x and 17–42% for materials with the Gd1 – xSrxCo0.5O3 – δ, Gd0.4Sr0.1Ni0.5O3 – δ, and Gd0.125La0.125Sr0.25Co0.5O3 – δ composition. Materials based on cerium oxide predominantly have the ionic (ion transport numbers ti = 0.71–0.89 in the range 300–700°С) type of electrical conductivity due to the formation of mobile oxygen vacancies in the heterovalent substitution of Ce4+ by Nd3+; and σ700°С = 0.31 × 10–2 S/cm Solid solutions based on nickelate and lanthanum cobaltite have mixed electron-ionic conductivity, σ700°С = 0.59 × 10–1 S/cm with transfer numbers te = 0.92–0.99 and ti = 0.08–0.01. The prospects for using the obtained ceramic materials as solid oxide electrolytes and electrodes for medium-temperature fuel cells (FCs) are shown. [ABSTRACT FROM AUTHOR]

Published
2024
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