氧化铈基复合电解质材料研究进展

Research Progress of Cerium Oxide-Based Composite Electrolyte Materials

固体氧化物燃料电池(SOFC)中低温化是未来的发展趋势,而单相电解质的离子电导率在600℃以下达不到应用的要求,制备高离子电导率的复合电解质成为发展的方向。本文主要综述了掺杂CeO2-无机盐(碳酸盐,硫酸盐)、掺杂CeO2-(金属)氧化物、掺杂CeO2-钙钛矿三类复合电解质,分析了第二相对CeO2基电解质性能的影响。掺杂CeO2-无机盐由于具有独特的H+/O2−共传导能力从而使复合电解质的电导率得到提高;掺杂CeO2-钙钛矿体系由于提高晶界电导率从而提高总电导率;掺杂CeO2-(金属)氧化物体系中氧化物的加入可以降低烧结温度并提高晶界电导率。研究结果有望为实验上制备性能优异的氧化铈基复合电解质提供理论指导。

Medium-low temperature solid oxide fuel cells is the development trend in the future, but the ionic conductivity of single-phase electrolytes cannot meet the application requirements below 600˚C, so the preparation of composite electrolytes with high ionic conductivity has become the development direction. In this paper, doped CeO2-inorganic salts (carbonate, sulfate), doped CeO2-(metal) oxides, and doped CeO2-perovskite composite electrolytes are reviewed, and the influence of second phase on the performance of CeO2-based electrolytesis analyzed. Due to the unique H+/O2− co-conductivity, the adding of inorganic salt can improve the conductivity of the doped CeO2-inorganic salt composite electrolyte. The increasing total conductivity of doped CeO2- perovskite system may be caused by the increasing the grain boundary conductivity. The addition of oxide in the doped CeO2-(metal) oxide system can decrease the sintering temperature and increase the grain boundary conductivity. The results are expected to provide theoret-ical guidance for the preparation of excellent cerium oxide composite electrolytes.