Effect of Synthetic Approaches and Sintering Additives upon Physicochemical and Electrophysical Properties of Solid Solutions in the System (CeO2)1−x(Nd2O3)x for Fuel Cell Electrolytes

IF 2.7 Q1 MATERIALS SCIENCE, CERAMICS

Ceramics-Switzerland Pub Date : 2023-05-11 DOI:10.3390/ceramics6020065

M. Kalinina, D. A. Dyuskina, I. Polyakova, S. Mjakin, I. Kruchinina

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Abstract

Finely dispersed (CeO2)1−x(Nd2O3)x (x = 0.05, 0.10, 0.15, 0.20, 0.25) powders are synthesized via liquid-phase techniques based on the co-precipitation of hydroxides and co-crystallization of nitrates. The prepared powders are used to obtain ceramic materials comprising fluorite-like solid solutions with the coherent scattering region (CSR) of about 88 nm (upon annealing at 1300 °C) and open porosity in the range of 1–15%. The effect of the synthesis procedure and sintering additives (SiO2, ZnO) on physicochemical and electrophysical properties of the resulting ceramics is studied. The prepared materials are found to possess a predominantly ionic type of electric conductivity with ion transfer numbers ti = 0.96–0.71 in the temperature range of 300–700 °C. The conductivity in solid solutions follows a vacancy mechanism with σ700 °C = 0.48 × 10−2 S/cm. Physicochemical properties (density, open porosity, type and mechanism of electrical conductivity) of the obtained ceramic materials make them promising as solid oxide electrolytes for medium temperature fuel cells.

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合成方法和烧结添加剂对燃料电池电解质(CeO2)1−x(Nd2O3)x体系固溶体理化和电物理性能的影响

基于氢氧化物的共沉淀和硝酸盐的共结晶，通过液相技术合成了精细分散的（CeO2）1−x（Nd2O3）x（x=0.05、0.10、0.15、0.20、0.25）粉末。所制备的粉末用于获得包含类萤石固溶体的陶瓷材料，其相干散射区（CSR）约为88 nm（在1300°C下退火时），开孔率在1–15%范围内。研究了合成工艺和烧结添加剂（SiO2、ZnO）对所制备的陶瓷的物理化学和电物理性能的影响。发现所制备的材料具有主要的离子型导电性，在300–700°C的温度范围内，离子转移数ti=0.96–0.71。固溶体中的电导率遵循空位机制，σ700°C=0.48×10−2 S/cm。所获得的陶瓷材料的物理化学性质（密度、开孔率、导电类型和机理）使其有望成为中温燃料电池的固体氧化物电解质。

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来源期刊

Ceramics-Switzerland Multiple-

CiteScore

3.00

自引率

7.10%

发文量

审稿时长

10 weeks