期刊
JOURNAL OF POWER SOURCES
卷 379, 期 -, 页码 206-211出版社
ELSEVIER
DOI: 10.1016/j.jpowsour.2018.01.055
关键词
Solid oxide fuel cell; Core-shell cathode; Coating thickness; Electrochemical performance; Stability
资金
- National Natural Science Foundation of China [51472099, 51502103]
Four PrBa0.5Sr0.5Co1.5Fe0.5O5+delta (PBSCF)-La2NiO4+delta (LN) core-shell cathodes, designated as PL-0, PL-1, PL-3 and PL-5, are prepared by infiltrating LN solution into PBSCF scaffold, and they are investigated in terms of the effect of LN thickness on their electrochemical performance. PL-3 with a continuous LN coating of a moderate average thickness (similar to 9 nm) demonstrates the lowest initial polarization resistance (0.51 Omega cm(2)) and highest power density (0.71 W cm(-2)) among all the cathodes. Polarized at 400 mA cm(-2) and 700 degrees C for up to 40 h, the polarization resistance of all the prepared cathodes increases to approach a stable level after early stage decrease due to current activation, and PL-3 exhibits a slower average rate of performance degradation (25%). The electrochemical performance improvement is mainly attributed to that LN has a relatively high oxygen surface exchange coefficient and continuous LN coating depresses Sr segregation at PBSCF/LN interface.
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