Enhanced electrochemical activity and stability of LSCF cathodes by Mo doping for intermediate temperature solid oxide fuel cells

被引：14
|
作者：
Liu, Yihui [1 ,2 ]
Zhou, Feng [1 ,2 ]
Chen, Xiyong [3 ]
Wang, Chao [1 ,2 ]
Zhong, Shaohua [1 ,2 ]
机构：
[1] Wuhan Univ Technol, Hubei Key Lab Adv Technol Automot Components, Wuhan 430070, Peoples R China
[2] Wuhan Univ Technol, Hubei Collaborat Innovat Ctr Automot Components T, Wuhan 430070, Peoples R China
[3] Guangxi Univ, Guangxi Key Lab Proc Nonferrous Met & Featured Ma, Sch Resources Environm & Mat, Nanning 530004, Guangxi, Peoples R China
来源：
JOURNAL OF APPLIED ELECTROCHEMISTRY | 2021年 / 51卷 / 03期
关键词：
LSCF cathode; Electrochemical performance and stability; Mo doping; Electrocatalytic activity; Polarization resistance;
D O I：
10.1007/s10800-020-01515-z
中图分类号：
O646 [电化学、电解、磁化学];
学科分类号：
081704 ;
摘要：
La0.6Sr0.4Co0.2Fe0.8O3-delta (LSCF), La0.6Sr0.4Co0.2Fe0.78Mo0.02O3-delta (LSCFM02), La0.6Sr0.4Co0.2Fe0.75Mo0.05O3-delta (LSCFM05) cathodes were prepared and their electrochemical performance and stability were investigated. Mo doping into LSCF, which is confirmed by X-ray diffraction (XRD) and Rietveld refinement, increases unit cell parameters from 3.893 to 3.924 angstrom, causing expansion of unit cell volume. Polarization resistance (R-p) value of LSCFM05 cathodes is less that of LSCF cathodes at 750 degrees C, indicating that Mo-doped LSCF exhibits enhanced electrochemical performance. X-ray photoelectron spectroscopy (XPS) analysis shows that high electrocatalytic activity for oxygen reduction reaction of Mo-doped LSCF cathodes is related to mixed-valent Mo5+/Mo6+. LSCFM05 cathodes have less degradation rate during 20 h testing at 700 degrees C in air compared to LSCF cathodes. XPS results show that Mo doping reduces Sr surface segregation and is responsible for the stability enhancement of LSCF cathodes. [GRAPHICS] .
引用
收藏
页码：425 / 433
页数：9
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