Yuan Mengke, Wang Zhe, Gao Juntao, Hao Hongru, Lv Zhe, Lou Xiutao, Xu Lingling, Li Jingwei, Wei Bo
School of Physics and Electronic Engineering, Harbin Normal University, Harbin 150025, China; School of Physics, Harbin Institute of Technology, Harbin 150001, China.
School of Physics, Harbin Institute of Technology, Harbin 150001, China.
J Colloid Interface Sci. 2024 Oct 15;672:787-796. doi: 10.1016/j.jcis.2024.06.038. Epub 2024 Jun 7.
The cathodes of solid oxide fuel cells (SOFCs) often suffer from detrimental cation segregations and associated impurities poisoning, leading to insufficient electroactivity and poor stability. Here we developed a medium-entropy double perovskite GdBa(CoMnFeNiCu)O (ME-GBCO) for promising SOFC cathode. The increased configuration entropy can effectively tailor the surface composition with in situ formed active BaCoO (BCO) species, rather than inert and deleterious BaO segregation on parent GdBaCoO (GBCO) surface. Accordingly, the layered ME-GBCO cathode with beneficial surface reconstruction exhibited not only high oxygen reduction activity but excellent durability against CO impurity, enabling it a very attractive cathode for intermediate temperature SOFCs (IT-SOFCs). Our study provides a new idea for development of efficient and durable cathodes via configurational entropy induced rational surface reconstruction.
固体氧化物燃料电池（SOFC）的阴极常常受到有害阳离子偏析和相关杂质中毒的影响，导致电活性不足和稳定性差。在此，我们开发了一种用于有望成为SOFC阴极的中熵双钙钛矿GdBa(CoMnFeNiCu)O（ME-GBCO）。增加的组态熵可以有效地通过原位形成活性BaCoO（BCO）物种来调整表面组成，而不是在母体GdBaCoO（GBCO）表面形成惰性且有害的BaO偏析。因此，具有有益表面重构的层状ME-GBCO阴极不仅表现出高的氧还原活性，而且对CO杂质具有出色的耐久性，使其成为中温SOFC（IT-SOFC）极具吸引力的阴极。我们的研究为通过组态熵诱导的合理表面重构开发高效耐用的阴极提供了新思路。
