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

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• 作者：Yu-Lin Kuo ; ^{ylkuo@mail.ntust.edu.tw} ; Yun-Yuan Liang
• 关键词：D. Apatite ; Lanthanum silicate ; La10(SiO4)6O3 ; Solid oxide fuel cells (SOFCs) ; Thermochemical stability
• 刊名：Ceramics International
• 出版年：2012
• 期刊代码：13_02728842
• 类别：ms
• 出版时间：July, 2012
• 卷：38
• 期：5
• 页码：3955-3961
• 文件大小：1170 K

摘要

Apatite-type lanthanum silicate with a formula of La₁₀(SiO₄)₆O₃ is a potential candidate electrolyte for SOFC system because of its high ionic conductivity and low activation energy. Pure La₁₀(SiO₄)₆O₃ powder was prepared by solid state reaction and using a suitable thermal pretreatment (1000 掳C/5 h) of the as-purchased La₂O₃ powder. Materials characterization, thermal behaviors, and electrical properties of La₁₀(SiO₄)₆O₃ samples were investigated by X-ray diffraction (XRD), scanning electron microscopy (SEM), thermogravimetric analysis (TGA) and two-point probe DC conductivity. A pure La₁₀(SiO₄)₆O₃ pellet was prepared at the sintering process of 1600 掳C and 2.5 h with a high relative sintered density of 96.91%. The existence of secondary phases in La₁₀(SiO₄)₆O₃ pellet resulted in a lower conductivity than that of pure La₁₀(SiO₄)₆O₃ pellet. Eight-hour reduction-resistant stability tests under reducing atmosphere at the elevated temperature of pure La₁₀(SiO₄)₆O₃ prepared in this study shows a good thermochemical stability as compared to the well-developed 8 mol%Y₂O₃ stabilized ZrO₂ (8YSZ).