Assessment of thermochemically stable apatite La10(SiO4)6O3 as electrolyte for solid oxide fuel cells

被引：27

作者：

Kuo, Yu-Lin ^{[1
]}

Liang, Yun-Yuan ^{[1
]}

机构：

[1] Natl Taiwan Univ Sci & Technol, Dept Mech Engn, Taipei 106, Taiwan

来源：

CERAMICS INTERNATIONAL | 2012年 / 38卷 / 05期

关键词：

Apatite; Lanthanum silicate; La-10(SiO4)(6)O-3; Solid oxide fuel cells (SOFCs); Thermochemical stability; ION CONDUCTIVITY; ELECTRICAL-PROPERTIES; DOPED CERIA; OXYAPATITE; OPERATION; SILICATES; STABILITY; PHASES; PURE; GD;

D O I：

10.1016/j.ceramint.2012.01.049

中图分类号：

TQ174 [陶瓷工业]; TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

Apatite-type lanthanum silicate with a formula of La-10(SiO4)(6)O-3 is a potential candidate electrolyte for SOFC system because of its high ionic conductivity and low activation energy. Pure La-10(SiO4)(6)O-3 powder was prepared by solid state reaction and using a suitable thermal pretreatment (1000 degrees C/5 h) of the as-purchased La2O3 powder. Materials characterization, thermal behaviors, and electrical properties of La-10(SiO4)(6)O-3 samples were investigated by X-ray diffraction (XRD), scanning electron microscopy (SEM), thermogravimetric analysis (TGA) and two-point probe DC conductivity. A pure La-10(SiO4)(6)O-3 pellet was prepared at the sintering process of 1600 degrees C and 2.5 h with a high relative sintered density of 96.91%. The existence of secondary phases in La-10(SiO4)(6)O-3 pellet resulted in a lower conductivity than that of pure La-10(SiO4)(6)O-3 pellet. Eight-hour reduction-resistant stability tests under reducing atmosphere at the elevated temperature of pure La-10(SiO4)(6)O-3 prepared in this study shows a good thermochemical stability as compared to the well-developed 8 mol% Y2O3 stabilized ZrO2 (8YSZ). (C) 2012 Elsevier Ltd and Techna Group S.r.l. All rights reserved.

引用

页码：3955 / 3961

页数：7

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