Ce-doped promotes the phase stability and electrochemical performance of SrCoO3-δ cathode for intermediate-temperature solid oxide fuel cells

被引：18
作者：
Li, Shuting [1 ,2 ,4 ]
Liu, Yuanyuan [2 ,3 ,4 ]
Cai, Changkun [1 ,2 ,4 ]
Xue, Ke [1 ,2 ,4 ]
Bian, Liuzhen [1 ,2 ,4 ]
An, Shengli [1 ,2 ,4 ]
机构：
[1] Inner Mongolia Univ Sci & Technol, Sch Mat & Met, Baotou 014010, Peoples R China
[2] Inner Mongolia Univ Sci & Technol, Inner Mongolia Key Lab Adv Ceram Mat & Devices, Baotou 014010, Peoples R China
[3] Inner Mongolia Univ Sci & Technol, Coll Chem & Chem Engn, Baotou 014010, Peoples R China
[4] Inner Mongolia Univ Sci & Technol, Key Lab Green Extract & Efficient Utilizat Light R, Minist Educ, Baotou 014010, Peoples R China
来源：
JOURNAL OF POWER SOURCES | 2024年 / 592卷
基金：
中国国家自然科学基金;
关键词：
Solid oxide fuel cells; Cathode; Phase transition; Thermal stability; Electrochemical performance; CATHODE MATERIAL; ELECTRICAL-CONDUCTIVITY; OXYGEN REDUCTION; PEROVSKITE OXIDES; B-SITE; SRCOO3-DELTA; STOICHIOMETRY; ELECTRODE; LA;
D O I：
10.1016/j.jpowsour.2023.233932
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：
The development of cathode with high oxygen reduction reaction (ORR) activity is crucial for intermediate-temperature solid oxide fuel cells (IT-SOFCs). SrCoO3-delta oxides, a mixed ion-electron conductivity (MIEC), are promising cathode materials. However, pure SrCoO3-delta exhibits a hexagonal or rhombohedral structure with poor electrical properties, limiting its application in IT-SOFCs. In this work, high-valence Ce4+ is doped at the A-site of SrCoO3-delta perovskite to improve the phase structural stability and electrochemical activity of SrCoO3-delta. The findings reveal that Ce4+ doping in small amounts significantly advances the conductivity and ORR activity due to enhanced structural stability. Among the series of samples, Sr0.95Ce0.05Co3-delta (SCC005) presents the best electrochemical performance. Moreover, the addition of Ce0.8Gd0.2O2-delta (GDC) further reduces polarization resistance by about similar to 7 times. The peak power density of 1.3 W cm(-2) is obtained at 750 degrees C for the SCC05-30%GDC cathode. The results indicate that A-site Ce doping is a promising strategy to enhance the ORR activity of SrCoO3-delta oxides.
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页数：9
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