期刊
JOURNAL OF POWER SOURCES
卷 268, 期 -, 页码 176-182出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jpowsour.2014.05.146
关键词
Solid oxide fuel cell; Element substitution; Cathode; Electrochemical performance
资金
- National Natural Science Foundation of China [21006015, 21070623]
- Foundation of Beijing Key Laboratory for Chemical Power Source and Green Catalysis [2013CX02031]
Sr2-xBaxFe1.5Mo0.5O6-delta (x = 0, 0.2, 0.4, 0.6, 0.8, 1) perovskite materials have been prepared as potential cathodes for intermediate temperature solid oxide fuel cells (IT-SOFCs) via a sol-gel combustion method. X-ray diffraction (XRD) confirms that the expansion of the unit cell derived from the substitution of the large radius Ba atom, with the impurity phase structure only being detected when x = 0.8 and 1. Concurrently, thermal expansion coefficients (TECs) increase with increasing Ba doping. X-ray photoelectron spectrometry (XPS) measurements show that A-site doped Ba in the perovskite has an insignificant impact on the existence and ratio of Fe2+/Fe3+ and Mo6+/Mo5+ species within the Sr2-xBaxFe1.5Mo0.5O6-delta (x = 0.2, 0.4, 0.6) (SBFM) samples. Compared with Sr2Fe1.5Mo0.5O6-delta, the SBFM cathodes exhibited better electrochemical performance, which has been confirmed by the electrochemical impedance spectra (EIS). In particular, Sr1.8Ba0.2Fe1.5Mo0.5O6-delta (SB0.2FM) shows the lowest interface polarization (R-p). Furthermore the peak power densities of single cells based on the SB0.2FM cathode are 0.87 and 1.30 W cm(-2) at 700 and 750 degrees C, respectively. All these results suggest that SBFM materials are promising cathodes for IT-SOFCs. (C) 2014 Published by Elsevier B.V.
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