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首页> 外文会议>Fourth International Symposium on Ionic and Mixed Conducting Ceramics, null >IONIC AND MIXED CONDUCTING CERIA-METAL (OXIDE) COMPOSITES: MATERIALS AND APPLICATIONS
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IONIC AND MIXED CONDUCTING CERIA-METAL (OXIDE) COMPOSITES: MATERIALS AND APPLICATIONS

机译：离子和混合导电铈金属（氧化物）复合材料：材料和应用

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摘要

Ceria-metal ceramic composites, especially, gadolinium doped ceria (GDC)-Ni/Al, were prepared. Ionic and mixed electron/ion conduction in this system can be controlled through composition and heat-treatment. There exist two thresholds of the metal content for ionic and percolative electron-dominant conduction in these ceria-metal (oxide) composites. In the ionic threshold, the ceria-metal- composites exhibited pure ionic conduction in oxygen; above the ionic threshold, the composite showed mixed conduction. Above the percolative threshold the metal particles can form a percolative metal phase causing dominant electron conduction from the metal phase with some ion conduction from the ceria phase. Enhancement in oxygen ion conduction was observed for these composites as compared to pure ceria. The composites were used as electrolytes for intermediate temperature solid oxide fuel cells (ITSOFCs), and exhibited much better fuel cell performance than when using pure ceria electrolytes. Further addition of a proton conducting inorganic salt phase, e.g., MOH (M = K, Na), resulted in still better performance between 400 and 600 ℃. In addition, the electronic conducting composites were also studied as fuel cell electrodes.
机译：制备了二氧化铈金属陶瓷复合材料，尤其是掺do二氧化铈（GDC）-Ni / Al。该系统中的离子和混合电子/离子传导可通过组成和热处理来控制。在这些二氧化铈-金属（氧化物）复合材料中，离子和渗透电子占主导地位的金属含量存在两个阈值。在离子阈值下，二氧化铈-金属复合材料在氧气中表现出纯的离子传导性。高于离子阈值，复合材料显示混合导电。高于渗滤阈值，金属颗粒可以形成渗滤金属相，导致金属相的主导电子传导和二氧化铈相的离子传导。与纯二氧化铈相比，观察到这些复合材料的氧离子传导增强。该复合材料用作中温固体氧化物燃料电池（ITSOFC）的电解质，并且与使用纯二氧化铈电解质相比，具有更好的燃料电池性能。进一步添加质子传导性无机盐相，例如MOH（M = K，Na），在400至600℃之间仍具有更好的性能。另外，还研究了导电复合材料作为燃料电池电极。

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