Study of the Electrophysical Properties of Solid Solutions with a Perovskite Structure in La2O3–SrO–Ni(Co,Fe)2O3–δ Systems for Cathode Electrodes for Fuel Cells

M. V. Kalinina; Калинина М. В.; D. A. Dyuskina; Дюскина Д. А.; I. G. Polyakova; Полякова И. Г.; M. Yu. Arsent’ev; Арсентьев М. Ю.; O. A. Shilova; Шилова О. А.

doi:10.31857/S013266512260087X

Study of the Electrophysical Properties of Solid Solutions with a Perovskite Structure in La2O3–SrO–Ni(Co,Fe)2O3–δ Systems for Cathode Electrodes for Fuel Cells

Authors: Kalinina M.V.¹, Dyuskina D.A.¹, Polyakova I.G.¹, Arsent’ev M.Y.¹, Shilova O.A.¹^,2^,3
Affiliations:
1. Grebenshchikov Institute of Silicate Chemistry, Russian Academy of Sciences
2. St. Petersburg State Technological Institute (Technical University)
3. St. Petersburg State Electrotechnical University “LETI”
Issue: Vol 49, No 2 (2023)
Pages: 158-170
Section: Articles
URL: https://ruspoj.com/0132-6651/article/view/663222
DOI: https://doi.org/10.31857/S013266512260087X
EDN: https://elibrary.ru/NWCLRR
ID: 663222

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Abstract

Finely dispersed mesoporous powders of the following composition are synthesized by the method of cocrystallization of nitrate salts with ultrasonic treatment: La1–xSrxNiO3–δ, La1–xSrxCoO3–δ, and La1–xSrxFe0.7Ni0.3O3–δ (x = 0.30; 0.40). Based on them, ceramic nanomaterials of the given composition with a coherent scattering region (CSR) of ~65–69 nm (1300°С) are obtained. Ceramics fired at 1300°C are single-phase and have a tetragonal and orthorhombic perovskite-type structure in the La2O3‒SrO‒Ni(Co,Fe)2O3–δ system. Solid solutions have mixed electron–ion conductivity with transfer numbers te = 0.98–0.90 and ti = 0.02–0.10. Ceramics with a tetragonal perovskite-type crystal structure exhibit higher electrical conductivity than materials having an orthorhombic perovskite-type crystal structure. According to their electrophysical properties related to the structural features of solid solutions, ceramic materials obtained based on them are promising as solid oxide cathodes for average-temperature fuel cells.

Keywords

nanoceramics, perovskite-type crystal structure, electrical conductivity, ionic and electronic fractions of conductivity, fuel cells, cathode materials

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