掺杂对CeO2基电解质材料性能的影响研究进展

掺杂CeO2基电解质是中低温固体氧化物燃料电池(SOFC)理想的电解质材料。首先阐述了掺杂CeO2基电解质结构与性能的关系,接着介绍了金属离子掺杂对CeO2基电解质晶体结构和电子结构的影响,重点综述了单元素掺杂和双元素掺杂对CeO2基电解质性能的影响。通过分析得出:稀土金属元素单掺杂比碱土金属元素单掺杂更能显著提高CeO2基电解质的导电性和可烧结性,但稀土氧化物的原料成本要远高于碱土氧化物;双元素掺杂比单元素掺杂具有更多的氧空位无序度和更小的氧离子迁移激活能,因此在提高CeO2基电解质的离子电导率方面更有优势。总结了CeO2基电解质材料的掺杂规律及构效关系,以期对制备出性能更加优异的CeO2基电解质起到一定的指导作用。

Research progress in effect of doping on properties of CeO2-based electrolyte materials

The doped CeO₂-based material is an ideal electrolyte material for medium-low temperature solid oxide fuel cells（SOFC）.Firstly,the relationship between the structure and properties of doped CeO₂-based electrolytes was described.Then,the effects of metal ion doping on the crystal structure and electronic structure of CeO₂-based electrolytes were introduced. The effects of single-element doping and two-element doping on the properties of CeO₂-based electrolytes were mainly revie-wed.By analysis,the results showed that：comparing with single-doping of alkaline earth elements,the single-doping of rare earth metal elements significantly improved the conductivity of CeO₂-based electrolytes,but the raw material cost of rare earth oxides was much higher than that of rare earth oxides.CeO₂-based electrolytes doping with two-element presented more oxygen vacancy disorder and less oxygen ion mobility activation energy than the single-element doping,so two-element doping had more advantages in improving the ionic conductivity of the CeO₂-based electrolyte.The doping rules and relationship be-tween the structure and properties of CeO₂-based electrolyte materials was summarized,in order to play a guiding role in the preparation of CeO₂-based electrolytes with better performance.