对称可逆固体氧化物电池电极材料结构-电化学特性-制备方法-工况应用研究

可逆固体氧化物电池（RSOC）是一种可以实现化学能和电能高效洁净转换的电化学能量转换装置。如何提高电极材料的电催化活性和工况（氧化/还原循环及放电/供电切换）稳定性是制约RSOC应用的核心问题之一。项目提出采用对称型RSOC结构（即同一种材料作为阴极和阳极），从典型的SrFeO3-δ基钙钛矿材料入手，从材料的基础科学理论出发解决RSOC电极材料在实际应用中遇到的问题，通过理论计算优化材料设计，阐明材料组成结构及演变特征；通过研究不同条件下的电化学性能，结合原位表征阐明材料导电机理及催化特性；通过一步合成，优化电极表界面结构及其传导途径，揭示多相耦合作用机制；通过工况模式研究，明确RSOC性能调控机制与工况应用的关系；最终建立快速衰减测试平台，评价材料长期稳定性，揭示工况稳定机制。项目将完成材料结构-性能-制备方法-工况应用全链条材料科学研究模式探索，为钙钛矿材料开发和实际应用奠定基础。

Reversible Solid Oxide Cell (RSOC) are clean and efficient electrochemical conversion devices that can achieve efficient and clean conversion of chemical energy and electrical energy. The major challenge in application of RSOC lies in how to further improve the electrochemical activity of electrode materials and their operation stability during working conditions (oxidation/reduction cycles, or SOFC/SOEC switching modes). Here, a symmetric RSOC structure has been proposed (same materials for both electrodes) in this project. The challenges in practical applications of RSOC electrode material will be resolved by basic science of materials derived from classical SrFeO3-δ based perovskite. Through theoretical calculation, the design of the material will be optimized in conjunction with the correlation between materials’ compositional structure and evolution characteristics. By studying the electrochemical performance under different conditions, combined with in-situ characterization, the material's conduction mechanism and catalytic properties were elucidated. By one-step synthesis, the transport pathways at the electrode surface or interface will be improved, uncovering the synergistic operation among multiphases. The interplay between RSOC performance and operating conditions will be ascertained by the investigation under operational modes. Most importantly, the platform for degradation testing will be built to assess the long-term stability of the proposed cells and unveil the corresponding operating mechanism. The project will complete the full development cycle of material science investigation, including material composition-property-synthesis-operation, which will lay the groundwork for the development and application of perovskite materials.