中温固体氧化物燃料电池扩散自稳定式复合阴极的性能优化及界面特性研究

固体氧化物燃料电池（SOFC）技术的发展正受制于阴极材料的稳定性与催化活性，针对这一技术发展瓶颈，本项目拟围绕高性能中温SOFC阴极材料La0.6Sr0.4Co0.2Fe0.8O3-δ（LSCF）进行优化改性。我们将引入高活性的A位缺位La0.95CoO3-δ（LC）材料原位生长并致密包覆于LSCF骨架表面构筑LSCF-LC复合阴极，以期对LSCF中扩散出的Sr元素进行包覆抑制、缺位吸收双重稳定作用；同时优化阴极体系的电子导电性与氧表面交换特性以提升阴极电化学性能。相关材料特性及其相互作用规律将在本项目中得到探究与明确，旨在重点解决LSCF/LC界面特性与电化学性能间的构效关系、包覆改性对阴极长期稳定性的优化机制等科学问题，最终研发适用于中温SOFC长期稳定运行的高性能阴极材料，并为SOFC阴极材料的性能优化与机理探究提供借鉴及指导意义。

Solid oxide fuel cell (SOFC) technology is limited by the stability and catalytic activity of cathode material. In view of this technical development bottleneck, this proposal focuses on the optimization and modification of the high performance intermediate temperature (IT) SOFC cathode material La0.6Sr0.4Co0.2Fe0.8O3-δ (LSCF). With highly active A-site deficient La0.95CoO3-δ (LC) oxide’s in-situ growth and dense coating, LSCF-LC composite cathode can be constructed. Enriched Sr element is expected to be stabilized by both the inhibition and absorption effect of LC protection, and the electronic conductivity and oxygen surface exchange performance of cathode can also be improved for catalytic activity optimization. The properties of related materials and their interaction mechanism will be explored and revealed in this proposal, aiming to resolve the relation between LSCF/LC interface characteristic and cathode electrochemical performance, and the stabilization effect of coating modification is to be elucidated, finally a stable cathode with high performance will be developed for IT-SOFC. The results will provide reference and guidance for SOFC cathode material’s performance enhancement and mechanism investigation.