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

IF 0.8 4区材料科学 Q4 MATERIALS SCIENCE, CERAMICS

Glass Physics and Chemistry Pub Date : 2023-05-24 DOI:10.1134/S1087659622601046

M. V. Kalinina, D. A. Dyuskina, I. G. Polyakova, M. Yu. Arsent’ev, O. A. Shilova

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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: La_1–xSr_xNiO_3–δ, La_1–xSr_xCoO_3–δ, and La_1–xSr_xFe_0.7Ni_0.3O_3–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)₂O_3–δ system. Solid solutions have mixed electron–ion conductivity with transfer numbers t_e = 0.98–0.90 and t_i = 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.

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燃料电池正极La2O3-SrO-Ni (Co,Fe)2O3 -δ体系中钙钛矿结构固溶体的电物理性质研究

采用硝酸盐超声共晶法制备了La1-xSrxNiO3 -δ、La1-xSrxCoO3 -δ和La1-xSrxFe0.7Ni0.3O3 -δ (x = 0.30;0.40)。在此基础上，获得了具有~65 ~ 69 nm(1300°С)相干散射区域(CSR)的陶瓷纳米材料。在1300℃下烧制的陶瓷为单相，具有La2O3-SrO-Ni (Co,Fe)2O3 -δ体系的四方和正交钙钛矿型结构。固溶体具有混合电子-离子电导率，传递数te = 0.98-0.90, ti = 0.02-0.10。具有四方钙钛矿型晶体结构的陶瓷比具有正交钙钛矿型晶体结构的材料具有更高的导电性。根据其与固溶体结构特征相关的电物理性质，在此基础上制备的陶瓷材料有望作为平均温度燃料电池的固体氧化物阴极。

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来源期刊

Glass Physics and Chemistry 工程技术-材料科学：硅酸盐

CiteScore

1.20

自引率

14.30%

发文量

审稿时长

6-12 weeks

期刊介绍： Glass Physics and Chemistry presents results of research on the inorganic and physical chemistry of glass, ceramics, nanoparticles, nanocomposites, and high-temperature oxides and coatings. The journal welcomes manuscripts from all countries in the English or Russian language.