期刊
JOURNAL OF POWER SOURCES
卷 324, 期 -, 页码 582-588出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jpowsour.2016.05.135
关键词
Impurity tolerance; Samaria-doped ceria; Grain boundary conduction; Solid oxide fuel cell
资金
- National Natural Science Foundation of China [51502136]
- Natural Science Foundation of Jiangsu Province [BK20140943]
- China Postdoctoral Science Foundation [2014M561637]
- Jiangsu Planned Projects for Postdoctoral Research Funds [1302011A]
- Priority Academic Program Development (PAPD) of Jiangsu Higher Education Institutions
Rapid oxygen ion conduction, which is important in solid oxide fuel cell (SOFC) electrolytes, is often dramatically hindered by the presence of even small concentrations of impurities such as SiO2, which is ubiquitous in ceramic processing. In this study, rapid degradation of the grain boundary (GB) conduction of Ce0.8Sm0.2O1.9 (SDC) is observed with increasing SiO2 addition from 0 to 1 wt%. Nearly complete GB conduction recovery is achieved through synergy between CaO and ZnO in the SDC + x wt% Si systems. Scanning electron microscopy (SEM) combined with energy dispersive spectroscopy (EDS) demonstrate the formation of a Ca-, Si-, and Sm-containing secondary phases, which is related to the enhancements in GB conductivity and reductions in activation energy. The scavenging effect of CaO is verified in this study and ZnO is observed to promote the scavenging reaction. Compared with the single-addition case (CaO/ZnO), the much higher SiO2 impurity tolerance of the combined system suggests the commercial potential of the scavenger + promoter strategy presented in this work. (C) 2016 Elsevier B.V. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据