阴极
材料科学
涂层
电化学
极化(电化学)
氧化物
X射线光电子能谱
复合数
阳极
拉曼光谱
化学工程
电极
化学
复合材料
冶金
物理化学
工程类
物理
光学
作者
Xuebai Zhang,Yingmin Jin,Yunjian Jiang,Xin Zong,Yumeng Li,Yueping Xiong
标识
DOI:10.1016/j.apsusc.2023.157445
摘要
The low catalytic activity and poor long-term stability of cathode at intermediate temperatures are one of the bottlenecks hindering the application of solid oxide fuel cells. In this work, the highly active and robust La0.8Sr0.2Co0.2Fe0.8O3-δ (LSCF) nanofibers based composite cathodes with core-shell structure is prepared applying electrospinning combined with sol-gel method. Owing to the favorable oxygen ion transport capability of Gd0.2Ce0.8O1.9-δ (GDC) nanoparticle coating layer, the GDC coated LSCF nanorods composite cathode with GDC:LSCF mass ratio of 0.51:1 obtains the optimal electrochemical performance, reaching a polarization impedance of 0.03 Ω cm2 at 800 °C. Meanwhile, the composite cathode exhibits no obvious degradation for constant operating 200 h. Remarkably, XPS and Raman characterizations imply that the applying of GDC coating inhibits the formation of SrO and SrCrO4 during the long-term operating in Cr containing atmosphere, thereby endowing the higher long-term operation stability and Cr poisoning tolerance to LSCF based cathode.
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