Publication date: 10th April 2024
The ABO3-type perovskite oxides have wide applications in many fields such as solid oxide fuel cells and electrolyzers, oxygen storage materials, catalytic water splitting, and oxygen permeation membranes. In recent years, with the development of high-entropy ceramics, the flexibility of composition tailoring in ABO3 materials has attracted significant attention as an entropy regulation system. Compared with classical solid solution doping, high-entropy ABO3 can exhibit superior properties as solid oxide cell electrode materials including significantly improved high-temperature stability and better electrochemical performances.
The characteristic local structural distortion brought about by the significant increase in configurational entropy may have important effects on the ion transport behavior of ABO3-type materials, thereby further affecting the microstructural evolution during their high-temperature sintering process and the electrochemical properties involving ion conduction performance. In this report, we will introduce our recent work on the air electrode materials for solid oxide cells, namely high-entropy AMnO3 and ACoO3, examining the correlation between configurational entropy and related local structural distortions with the generation, distribution, and transport of oxygen and metal ion vacancies, and discussing the mechanisms influencing the sintering and electrochemical performance of the materials. Through such work, we hope to enhance the understanding of new structure-function relationships in entropy-regulated ABO3-type oxides, thereby promoting the applications of high-entropy oxide materials in solid oxide cells and other relevant devices requiring integrated structural-functional properties.
Shi, Y.; Ni, N.; Ding, Qi.; Zhao, X. Tailoring high-temperature stability and electrical conductivity of high entropy lanthanum manganite for solid oxide fuel cell cathodes, J. Mater. Chem. A 2022, 2256-2270
Shi, Y.; Zhang, H.; Ren, G.; Xiao, W.; Li, L.; Hu, Y.; Reddy, K. M;, Zhao, X.; Zhu, L.; Ni, N. Role of mixed entropy in sintering of manganite-based perovskite oxides: Faster densification with delayed grain growth. Acta Mater. 2024, 271, 119906.
This work was financially supported by the National Natural Science Foundation of China (No. 52072238) and the project supported by the Shanghai Municipal Science and Technology Major Project.
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