期刊
ELECTROCHEMISTRY COMMUNICATIONS
卷 11, 期 5, 页码 1052-1056出版社
ELSEVIER SCIENCE INC
DOI: 10.1016/j.elecom.2009.03.010
关键词
SOFC; Microstructure; FIB-SEM; Nanotomography; Cathodes; LSM-YSZ
资金
- National Science Foundation [DMR-0542740, DMR-0542619, 0645812]
- JSPS Postdoctoral Fellowship [P08016]
- Ministry of Education, Science, Technology, Culture and Sports, Japan [2008016]
- Direct For Mathematical & Physical Scien [0907030] Funding Source: National Science Foundation
- Direct For Mathematical & Physical Scien
- Division Of Materials Research [0907639] Funding Source: National Science Foundation
- Division Of Materials Research [0907030] Funding Source: National Science Foundation
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [0645812] Funding Source: National Science Foundation
Solid oxide fuel cells (SOFCs) are being actively developed world wide for clean and efficient electrical generation from fuels such as natural gas, hydrogen, coal, and gasoline. The cathode in state of the art SOFCs is typically a porous composite of electronically-conducting La(1-x)Sr(x)MnO(3) (LSM) and ionically-conducting Y(2)O(3)-stabilized ZrO(2) (YSZ) that facilitates the critical oxygen reduction reaction. Here we describe the three-dimensional characterization and quantification of key structural parameters from an LSM-YSZ cathode, using imaging and volume reconstruction based on focused ion beam - scanning electron microscopy. LSM-YSZ-pore three-phase boundaries (TPBs) were identified. Approximately 1/3 of the TPBs were found to be electrochemically inactive, as they were on isolated LSM particles, yielding an active TPB density of 4.9 mu m(-2). Cathode electrochemical modeling, which included a measured YSZ tortuosity of 3.4, yielded an effective TPB resistance of approximate to 2.5 x 10(5) Omega cm at 800 degrees C. (C) 2009 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