Synthesis and Physical-Chemical Study of Nanopowders and Ceramics in the Gd2O3–La2O3–SrO–Ni(Co)O3 – δ System for Cathode Fuel Cell Materials

IF 0.6 4区材料科学 Q4 MATERIALS SCIENCE, CERAMICS

Glass Physics and Chemistry Pub Date : 2025-09-23 DOI:10.1134/S1087659625600176

M. V. Kalinina, I. G. Polyakova, S. V. Myakin, A. S. Kovalenko, I. A. Drozdova, O. A. Shilova

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Abstract

Highly dispersed mesoporous powders of the composition Gd_1 – xSr_xCo_0.5O_3 – δ (x = 0.1, 0.15, 0.2, 0.25), Gd_0.4Sr_0.1Ni_0.5O_3 – δ, and Gd_0.125La_0.125Sr_0.25Co_0.5O_3 – δ are synthesized using the method of the cocrystallization of nitrate salts. Ceramic nanomaterials of the given composition with a CSR of ~49–62 nm (1200°С), open porosity of 17–42%, and apparent density of 5–7 g/cm³ are obtained based on them. Nanopowders and ceramics in the range of 600–1200°C have a tetragonal and orthorhombic structure of the perovskite type in the Gd₂O₃‒SrO‒Co₂O_3 – δ system. It is established that in order to obtain the optimal characteristics of density and porous structure of ceramics, combined additives of polyvinyl alcohol (PVA) are required in combination with aluminum hydroxide Al(OH)₃, acting as a pore-forming and sintering additive. The solid solutions have mixed electron-ionic conductivity with transport numbers t_e = 0.92–0.99 and t_i = 0.08–0.01. Due to their physical, chemical, and electrophysical properties associated with the structural features of solid solutions, ceramic materials obtained based on them are promising for use as solid oxide cathodes for medium-temperature fuel cells.

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阴极燃料电池材料Gd2O3-La2O3-SrO-Ni (Co)O3 - δ体系纳米粉体及陶瓷的合成与物理化学研究

采用硝酸盐共结晶的方法合成了Gd1 - xSrxCo0.5O3 - δ (x = 0.1, 0.15, 0.2, 0.25)、Gd0.4Sr0.1Ni0.5O3 - δ和Gd0.125La0.125Sr0.25Co0.5O3 - δ等高度分散的介孔粉体。在此基础上，得到了相应成分的陶瓷纳米材料，其CSR为~49 ~ 62 nm（1200°С），开孔率为17 ~ 42%，表观密度为5 ~ 7 g/cm3。在600 ~ 1200℃范围内，纳米粉体和陶瓷在Gd2O3-SrO-Co2O3 - δ体系中具有钙钛矿型的四方和正交结构。为了获得最佳的陶瓷密度和多孔结构特性，需要聚乙烯醇（PVA）复合添加剂与氢氧化铝Al(OH)3复合，作为成孔和烧结添加剂。固溶体具有混合电导率，输运数te = 0.92 ~ 0.99, ti = 0.08 ~ 0.01。由于其与固溶体结构特征相关的物理、化学和电物理性质，基于它们获得的陶瓷材料有望用作中温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.