氧化物
阴极
钙钛矿(结构)
材料科学
化学工程
固体表面
无机化学
纳米技术
化学
化学物理
冶金
物理化学
工程类
作者
Mengke Yuan,Zhe Wang,Juntao Gao,Hongru Hao,Zhe Lv,Xiutao Lou,Lingling Xu,Jingwei Li,Bo Wei
标识
DOI:10.1016/j.jcis.2024.06.038
摘要
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(Co1.2Mn0.2Fe0.2Ni0.2Cu0.2)O5-δ (ME-GBCO) for promising SOFC cathode. The increased configuration entropy can effectively tailor the surface composition with in situ formed active BaCoO3-δ (BCO) species, rather than inert and deleterious BaOx segregation on parent GdBaCo2O5-δ (GBCO) surface. Accordingly, the layered ME-GBCO cathode with beneficial surface reconstruction exhibited not only high oxygen reduction activity but excellent durability against CO2 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.
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