The high-entropy oxide (HEO) concept expands the design space of solid oxide fuel cell (SOFC) cathode materials. There is great potential for the development of HEO cathode materials that has not been fully explored, and the relationship between their chemical composition, grain size, and electrochemical performance is not yet fully understood. This experimental design involved the preparation of single-phase perovskite (SrBaBiLaPr)FeO HEO SOFC cathode materials, and we systematically studied the effects of synthesis temperature and microstructure on their electrochemical performance. The results show that as the synthesis temperature increases, structural transformations from multiphase to single-phase perovskite HEO can be observed. It exhibits excellent conductivity and electrochemical performance (the minimum polarization resistance reaches 0.033 Ω∙cm, and the maximum power density is 664 mW∙cm). The single-phase perovskite HEO sample exhibits higher electrochemical performances compared to those of multiphase perovskite. Furthermore, it exhibits outstanding ability to suppress Sr segregation, chemical compatibility with CeSmO(SDC), and CO tolerance performance. The Distribution of relaxation time(DRT) analysis shows that as the synthesis temperature (1000–1150 ℃) increase, HEO single-phase formed and the oxygen atom reduction ability of the SBBLP samples was improved; and the adsorption of gas oxygen on the electrode surface is limited with porosity decreases. The work shows it is interesting and valuable to optimize the performance of SOFC cathode materials using a high entropy design.

中文翻译：

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高熵钙钛矿(Sr0.2Ba0.2Bi0.2La0.2Pr0.2)FeO3 IT-SOFC正极材料的制备及性能研究

高熵氧化物（HEO）概念扩展了固体氧化物燃料电池（SOFC）阴极材料的设计空间。 HEO正极材料的发展潜力尚未得到充分开发，其化学成分、晶粒尺寸和电化学性能之间的关系尚未完全了解。本实验设计涉及单相钙钛矿(SrBaBiLaPr)FeO HEO SOFC正极材料的制备，并系统研究了合成温度和微观结构对其电化学性能的影响。结果表明，随着合成温度的升高，可以观察到钙钛矿HEO从多相到单相的结构转变。它具有优异的导电性和电化学性能（最小极化电阻达到0.033 Ω∙cm，最大功率密度为664 mW∙cm）。与多相钙钛矿相比，单相钙钛矿 HEO 样品表现出更高的电化学性能。此外，它还表现出出色的抑制Sr偏析的能力、与CeSmO(SDC)的化学相容性以及耐CO性能。弛豫时间分布（DRT）分析表明，随着合成温度（1000~1150 ℃）的升高，形成HEO单相，SBBLP样品的氧原子还原能力提高；随着孔隙率的降低，气体氧在电极表面的吸附受到限制。这项工作表明，使用高熵设计来优化 SOFC 正极材料的性能是有趣且有价值的。