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题名: Scandium-Doped La0.8Sr0.2MnO3-delta Cathode Materials for Intermediate-Temperature Solid Oxide Fuel Cells
作者: Yue Xiangling1, 2;  Liu Lin1;  Zhang Min1, 2;  Yang Min1, 2;  Dong Yonglai1;  Cheng Mojie1
关键词: intermediate-temperature solid oxide fuel cell ;  scandium ;  La0.8Sr0.2MnO3-delta ;  composite cathode material ;  scandium oxide ;  oxygen vacancy
刊名: CHINESE JOURNAL OF CATALYSIS
发表日期: 2009-02-01
卷: 30, 期:2, 页:95-103
收录类别: SCI
文章类型: Article
WOS标题词: Science & Technology ;  Physical Sciences ;  Technology
类目[WOS]: Chemistry, Applied ;  Chemistry, Physical ;  Engineering, Chemical
研究领域[WOS]: Chemistry ;  Engineering
英文摘要: La0.8Sr0.2Mn1-xScxO3-delta(abbreviated as LSMSx, x = 0, 0.02, 0.05, and 0.1) samples were prepared using a modified Pechini method. X-ray diffraction (XRD) and temperature-programmed reduction (H-2-TPR) were carried out to characterize the structure and the reduction behavior of the LSMSx samples. Electrochemical evaluation was employed to assess the performance of intemiediate-temperature solid oxide fuel cells (IT-SOFCs) using LSMSx-based cathode. XRD analysis indicated that the pure perovskite structure could only be obtained at the sintering temperature of 900 degrees C and lower Sc doping concentration (x < 0.1). As the increase of sintering temperature and Sc doping concentration, the Sc2O3 secondary phase tended to segregate from the perovskite structure. The H-2-TPR profiles of LSMSx samples were greatly affected by the sintering temperature. The substitution-induced improvement in reducibility for LSMS samples was detected, which might be ascribed to the increases of Mn4+ and oxygen vacancies. It can also be found that the increase of Sc2O3 Separation possibly brought adverse effect to the reducibility of LSMS samples. Electrochemical evaluation results showed that the performance of the cells with different cathodes was affected by the Sc doping concentration, operation temperature, as well as the cathode sintering temperature. In the range of Sc doping concentration studied, LSMS-based cathode materials showed higher lower-temperature performance than Sc free LSM-based materials. This is primarily due to the increase of substitution-induced oxygen vacancies, which improved the electrochemical activity towards oxygen reduction for LSM-based cathode materials.
关键词[WOS]: PEROVSKITE-TYPE OXIDES ;  COMPOSITE CATHODES ;  CATALYTIC COMBUSTION ;  REDOX PROPERTIES ;  PERFORMANCE ;  SOFCS ;  BA0.5SR0.5CO0.8FE0.2O3-DELTA ;  LAMN1-XCUXO3 ;  TRANSPORT ;  OXIDATION
语种: 英语
WOS记录号: WOS:000264168700005
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/141558
Appears in Collections:中国科学院大连化学物理研究所_期刊论文

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作者单位: 1.Chinese Acad Sci, Dalian Inst Chem Phys, Dalian 116023, Peoples R China
2.Chinese Acad Sci, Grad Univ, Beijing 100049, Peoples R China

Recommended Citation:
Yue Xiangling,Liu Lin,Zhang Min,et al. Scandium-Doped La0.8Sr0.2MnO3-delta Cathode Materials for Intermediate-Temperature Solid Oxide Fuel Cells[J]. CHINESE JOURNAL OF CATALYSIS,2009,30(2):95-103.
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