期刊
JOURNAL OF POWER SOURCES
卷 214, 期 -, 页码 7-14出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jpowsour.2012.03.050
关键词
Solid oxide fuel cells; Cathodes; Thermal expansion coefficient; Phase stability
资金
- Welch Foundation [F-1254]
- National Science Foundation MIRT [DMR-1122603]
- Laboratory Directed Research and Development (LDRD) Program of ORNL
- ORISE
- Spallation Neutron Source
- Division of Scientific User Facilities, Office of Basic Energy Sciences, U.S. Department of Energy
- Direct For Mathematical & Physical Scien
- Division Of Materials Research [1122603] Funding Source: National Science Foundation
(Y0.5In0.5)BaCo4-xZnxO7 (1.0 <= x <= 2.0) oxides crystallizing in a trigonal P31c structure have been explored as alternative cathode materials for solid oxide fuel cells (SOFC). At a given Zn content, the (Y0.5In0.5) BaCo4-xZnxO7 compositions exhibit superior phase stability compared to YBaCo4-xZnxO7 and InBaCo4-xZnxO7 at the operating temperatures of SOFC (600-800 degrees C). In the (Y0.5In0.5)Ba(Co4-xZnx)O-7 system, the x = 1 sample offers a combination of good electrochemical performance, low thermal expansion coefficient (TEC), and enhanced chemical stability against Ce0.8Gd0.2O1.9 (GDC) electrolyte while demonstrating good phase stability at 600-800 degrees C for 100 h. Optimum cathode performance could be obtained by employing (Y0.5In0.5)BaCo3ZnO7 + GDC (50:50 wt.%) composite cathodes attached at 850 degrees C for 3 h as evidenced by ac-impedance spectroscopy, and the fuel cell performance of this composite cathode was evaluated using anode-supported single cells. With a combination of excellent high-temperature phase stability, low TEC, and good electrochemical performances, the trigonal (Y0.5In0.5)BaCo3ZnO7 composition is an attractive cathode candidate for intermediate temperature SOFC. (C) 2012 Elsevier B.V. All rights reserved.
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