Liquid-Phase Synthesis and Physical and Chemical Properties of Ceramic Electrolyte Nanomaterials in the CeO2–Sm2O3 System for Solid Oxide Fuel Cells

• Published in: Inorganic materials : applied research 2020, Vol.11 (5), p.1229-1235
• Main Authors: Kalinina, M. V., Duskina, D. A., Kovalko, N. Yu, Myakin, S. V., Arsent’ev, M. Yu, Khristyuk, N. A., Shilova, O. A.
• Format: Article
• Language: English
• Subjects: Cerium oxides; Chemical properties; Chemical synthesis; Chemistry; Chemistry and Materials Science; Crystallites; Crystallization; Electrical resistivity; Electrolytes; Electrolytic cells; Fluorite; Fuel cells; Grain size; Industrial Chemistry/Chemical Engineering; Inorganic Chemistry; Liquid phases; Materials Science; Molten salt electrolytes; Nanomaterials; New Technologies for Design and Processing of Materials; Porosity; Solid electrolytes; Solid oxide fuel cells
• ISSN: 2075-1133; 2075-115X
• DOI: 10.1134/S2075113320050147

By the method of joint crystallization of solutions of nitrate salts, the highly dispersed powders of the composition (CeO 2 ) 0.98 (Sm 2 O 3 ) 0.02 , (CeO 2 ) 0.95 (Sm 2 O 3 ) 0.05 , and (CeO 2 ) 0.90 (Sm 2 O 3 ) 0.10 are synthesized, and on their basis, nanoceramic materials with a crystalline cubic structure of fluorite type are obtained, with the grain size of the crystallites of ~68–81 nm (1300°С). Their mechanical and electrophysical properties are studied; it is found that they have an open porosity of 2–6% and predominantly ionic ( t i = 0.82–0.71 in the range of 300–700°C) type of electrical conductivity due to the formation of mobile oxygen vacancies during the heterovalent replacement of Се 4+ with Sm 3+ , σ 700°C =1.3 × 10 –2 S/cm. The studies show the prospects of using the obtained ceramic materials as solid oxide electrolytes of intermediate-temperature fuel cells.