Experimental study and first-principles calculation of enhanced electrochemical properties of Bi0.7Sr0.3FeO3-δ (BSFO) - La0.8Sr0.2MnO3-δ (LSM) composite cathodes for intermediate-temperature solid oxide fuel cells

被引：10
作者：
Li, Zhiyuan [1 ,2 ]
Wu, Tong [1 ,2 ]
Zhang, Zhenhao [3 ]
Sun, Haibin [1 ,4 ]
Guo, Xue [1 ]
Hu, Qiangqiang [1 ]
Feng, Yurun [1 ]
机构：
[1] Shandong Univ Technol, Sch Mat Sci & Engn, Zibo 255049, Peoples R China
[2] Donghua Univ, Coll Environm Sci & Engn, Shanghai 201620, Peoples R China
[3] Shandong Yasai Ceram Technol Co Ltd, Jinan 271100, Peoples R China
[4] 266 Xincun West Rd, Zibo 255000, Peoples R China
来源：
JOURNAL OF POWER SOURCES | 2024年 / 591卷
关键词：
Solid oxide fuel cell; Composite cathode; Electrochemical performance; First-principles calculation; OXYGEN REDUCTION REACTION; TRIPLE PHASE-BOUNDARY; MICROSTRUCTURE; ELECTROLYTE; PERFORMANCE; ANODE;
D O I：
10.1016/j.jpowsour.2023.233898
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
In order to enhance the electrochemical performance of cobalt-free Bi0.7Sr0.3FeO3-delta (BSFO) cathodes for intermediate-temperature solid oxide fuel cells (IT-SOFCs), a composite cathode consisting of BSFO and La0.8Sr0.2MnO3-delta (LSM) is developed. The optimized polarization resistance of the composite cathode (0.11 Omega cm(2) at 800 degrees C) is found to be only 61 % that of pure BSFO (0.18 Omega cm(2) at 800 degrees C), indicating a significant improvement in performance. The first-principles calculation indicates that the enhanced electrochemical performance is mainly due to the domain of low oxygen vacancy formation energies of BSFO-LSM-L interfaces (E-vac, -3.63 eV) and LSM (E-vac, 3.11 eV). The anode-supported single cell of NiO-SDC/SDC/BSFO-LSM shows a peak power density of 825.83 mW cm(-2) at 800 degrees C using wet H-2 (similar to 3 vol% H2O) as fuels and ambient air as oxidants. In addition, the single cell exhibits a good stability at the electric current density 400 mA cm(-2) for 50 h measured at 650 degrees C.
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页数：8
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