固体氧化物燃料电池氧化物修饰镧锶钴铁阴极研究进展

Recent Progress in Oxide Modified Lanthanum Strontium Cobalt Ferrite Cathode for Solid Oxide Fuel Cell

固体氧化物燃料电池(SOFC)有潜力成为最有效和清洁的能源转换技术之一,但SOFC的商业化进程仍需要在材料与制造工艺方面不断创新,以提高电池寿命和降低成本。在中温(500℃~700℃)运行工况下,电池的主要极化损失来自于阴极的氧还原反应。因此,发展高效、稳定的新型阴极材料和电极制备方法至关重要。近年来,镧锶钴铁氧化物已经成为被广泛使用的典型中温SOFC阴极材料,对其物化性质和电化学性能的研究报道也很多。为进一步提高其性能和稳定性,新型电极制备方法应运而生。表面修饰是一种有效提升电极性能和稳定性的手段,它能使修饰相和骨架之间形成强耦合关系,以产生协同促进效应。综述了采用溶液浸渍方法,在镧锶钴铁材料骨架表面进行氧化物修饰改性来提高SOFC阴极性能的研究进展。分别从二元氧化物、三元氧化物和多元氧化物三类氧化物浸渍相来进行阐述,讨论了不同浸渍相对骨架材料氧离子传输性能、电化学性能和长期稳定性能的影响。

Solid oxide fuel cell(SOFC) has been considered to be one of the most clean and efficient energy conversion devices. However, the market penetration of SOFC still requires continuous materials innovation and fabrication to enhance cell lifespan and reduce cost. At intermediate operating temperatures(500–700 ℃), the polarization loss mainly stems from the oxygen reduction reaction at the cathode. Therefore, it is of great importance to develop new cathodes and new methods with high efficiency and stability. Recently, LaSrCoFeO(LSCF) has become the wide and practical cathode for intermediate-temperature SOFC, whose physicochemical properties and electrochemical performance have been extensively studied. To further improve its performance and stability, various new electrode fabrication techniques come into view. Surface modification is an effective way to improve the performance and durability of the electrode, which can form a strong interaction between the modification phase and substrate material to have synergistic effect. Research progress in oxide on the surface of LSCF by solution infiltration method will be reviewed. From the point view of modification of binary oxides,ternary oxides and multibasic oxide were discussed, the effects of impregnation on the oxygen ion transport properties,electrochemical performance and long-term stability of substrate materials will be summarized.