电解质
离子电导率
材料科学
电导率
离子键合
电化学
氧化物
异质结
固体氧化物燃料电池
半导体
化学工程
离子
分析化学(期刊)
光电子学
化学
电极
物理化学
冶金
有机化学
色谱法
工程类
作者
Jiamei Liu,Decai Zhu,Chengjun Zhu,Yingbo Zhang,M. I. Asghar,Yifu Jing,Erjun Bu,Manish Singh,Peter D. Lund
标识
DOI:10.1021/acs.jpcc.4c01940
摘要
The electrolyte in a solid oxide fuel cell (SOFC) should have high ionic conductivity to guarantee high fuel cell performance. This requires tuning of the electrolyte structure, which is often limited by poor electrolyte performance when the operating temperature. Here, we report ceria–semiconductor (Sm0.075Nd0.075Ce0.85O2−δ, SNDC)/insulator (i-Al2O3) heterostructure composite electrolyte which enhances ionic conductivity and improves fuel cell performance by the interfacial engineering. A maximum power density of 1312.5 mW·cm–2 and an ionic conductivity of 0.18 S·cm–1 at 550 °C were achieved. A small amount of an ultrawide band gap i-Al2O3 (molar ratio of 92SNDC-8Al2O3) effectively improved the ionic transport of the electrolyte by creating a potential energy barrier at the heterointerface. In addition, the n–i suppresses electron conduction and improves the ionic conduction, contributing to the outstanding electrochemical performance observed. The results demonstrate that the interfacial engineering of the electrolyte could be a simple and effective method to facilitate the fast transport of the ions in low-temperature SOFCs.
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