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题名: Understanding of redox behavior of Ni-YSZ cermets
作者: Zhang, Yun1, 2, 3;  Liu, Bin1, 2, 3;  Tu, Baofeng1, 2;  Dong, Yonglai1, 2;  Cheng, Mojie1, 2
关键词: SOFC ;  Ni-YSZ cermet ;  Redox ;  TPO ;  TPR ;  SEM
刊名: SOLID STATE IONICS
发表日期: 2009-12-08
DOI: 10.1016/j.ssi.2009.10.011
卷: 180, 期:36-39, 页:1580-1586
收录类别: SCI
文章类型: Article
WOS标题词: Science & Technology ;  Physical Sciences
类目[WOS]: Chemistry, Physical ;  Physics, Condensed Matter
研究领域[WOS]: Chemistry ;  Physics
英文摘要: The oxidation of Ni-YSZ cermet as well the reduction of re-oxidized Ni-YSZ cermet was investigated by using temperature-programmed oxidation (TPO), temperature-programmed reduction (TPR) and scanning electron microscope (SEM). The scanning electron microscope (SEM) photographs and temperature-programmed reduction (TPR) profiles indicated that the sintering of smaller nickel oxide crystallites to larger aggregates occurred concurrently with the formation of smaller nickel oxide crystallites from the oxidation of nickel at 800 degrees C, and the sintering of smaller nickel oxide crystallites at 600 degrees C was slower than that at 800 degrees C. The SEM results showed that each Ni particle was separated into a lot of smaller NiO particles during oxidation. The TPO profiles showed that two kinds of nickel particles exist in the anode reduced at 800 and 600 degrees C, one with high activity towards oxidation for the nickel crystallites directly from reduction, and another one with low activity towards oxidation for the sintered nickel particles. The Ni-YSZ anodes reduced at higher temperature showed higher re-oxidation temperature than the one reduced at lower temperature because of the accelerated passivating and sintering of the smaller nickel particles at higher temperature. The re-oxidation profiles were almost unchanged during redox cycling at 600 degrees C. whereas the re-oxidation peak temperature decreased during redox cycling at 800 degrees C, indicating that the primary nickel grains split to smaller ones upon cyclic reduction at higher temperature. (C) 2009 Elsevier B.V. All rights reserved.
关键词[WOS]: OXIDE FUEL-CELLS ;  SOFC ANODES ;  IN-SITU ;  MICROSTRUCTURAL CHARACTERIZATION ;  REDUCTION ;  OXIDATION ;  DURABILITY ;  TOLERANCE ;  KINETICS
语种: 英语
WOS记录号: WOS:000273439600007
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/141401
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, Lab Fuel Cell, Dalian 116023, Peoples R China
2.Dalian Natl Lab Clean Energy, Dalian 116023, Peoples R China
3.Chinese Acad Sci, Grad Sch, Beijing 100039, Peoples R China

Recommended Citation:
Zhang, Yun,Liu, Bin,Tu, Baofeng,et al. Understanding of redox behavior of Ni-YSZ cermets[J]. SOLID STATE IONICS,2009,180(36-39):1580-1586.
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