Feasibility and mechanism of lithium oxide as sintering aid for Ce_0.8Sm_0.2O_¦Ä electrolyte

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• 作者：Shuai Li ; Cunni Xian ; Kai Yang ; Chunwen Sun ; Zhaoxiang Wang ; ^{zxwang@iphy.ac.cn} ; Liquan Chen
• 关键词：Sintering aid ; Lithium oxide ; Liquid sintering mechanism ; Solid oxide fuel cell
• 刊名：Journal of Power Sources
• 出版年：2012
• 出版时间：1 May, 2012
• 年：2012
• 卷：205
• 期：Complete
• 页码：57-62
• 全文大小：1659 K

文摘

Cerium oxide is a promising material for electrodes and electrolytes of solid oxide fuel cells (SOFCs). Lowering the sintering temperature of the electrolyte will bring a lot of benefits to the fabrication of SOFCs. This paper evaluates the feasibility of using lithium oxide as a sintering aid to reduce the densification temperature of samarium-doped ceria (Ce_0.8Sm_0.2O_1.9, SDC) by SEM and electrochemical impedance spectroscopy. It is shown that the addition of Li₂CO₃ can indeed decrease the sintering temperature of SDC. More attention is paid to understand the aiding mechanism of Li₂CO₃. Raman spectroscopy and thermal analysis indicate that it is Li₂O, a decomposition product of Li₂CO₃, that facilitates the sintering by way of a liquid phase sintering effect on the grain boundaries of SDC. These findings help to promote the application of ceria-based electrolytes for intermediate temperature SOFCs.