电解质
阳极
钙钛矿(结构)
氧化物
材料科学
电导率
兴奋剂
异质结
工作温度
电化学
化学工程
光电子学
化学
电气工程
电极
物理化学
工程类
冶金
作者
Liwen Zuo,Cong Jiang,Yu Liu,Dan Zheng,Kang Yuan,Hao Wang,Baoyuan Wang
摘要
It is one of the effective strategies to develop intermediate-temperature solid oxide fuel cells (IT-SOFCs) by looking for alternative electrolyte materials that can maintain or even improve current cell efficiencies while reducing operating temperature. In this study, by rationally introducing pentavalent Nb on the B-site of La0.6Sr0.4FeO3−δ (LSFO), a serial of novel perovskite La0.6Sr0.4Fe1−xNbxO3−δ (LSFNbx, x = 0.1, 0.2) with mixed electron-ion conduction is successfully prepared. The electrochemical mechanism and performance of the symmetrical IT-SOFCs with a single LSFNbx perovskite oxide as electrolyte are investigated. With the Nb doping, the structure stability of the LSFO is improved and the electronic conductivity decreases. La0.6Sr0.4Fe0.8Nb0.2O3−δ (LSFNb20) is the most promising electrolyte of the three candidates as it has the best performance (735 mW cm−2 at 550 °C in a dry H2/Air atmosphere) and no short-circuiting problem. The applied voltage-response current curves demonstrate that the interface between the Ni-Ni0.8Co0.15Al0.05LiO2−δ anode and LSFNb20 electrolyte can block electron conduction more efficiently and has a better promoting effect on protons, which is fundamentally due to the band energy alignment of the interface heterojunction. Our work highlights that LSFNb20 is a high-performance perovskite alternative to monolayer electrolytes.
科研通智能强力驱动
Strongly Powered by AbleSci AI