Two types of diffusions at the cathode/electrolyte interface in IT-SOFCs

Li, Zhi-Peng, Mori, Toshiyuki, Auchterlonie, Graeme John, Zou, Jin and Drennan, John (2011) Two types of diffusions at the cathode/electrolyte interface in IT-SOFCs. Journal of Solid State Chemistry, 184 9: 2458-2461. doi:10.1016/j.jssc.2011.07.021

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Author Li, Zhi-Peng
Mori, Toshiyuki
Auchterlonie, Graeme John
Zou, Jin
Drennan, John
Title Two types of diffusions at the cathode/electrolyte interface in IT-SOFCs
Journal name Journal of Solid State Chemistry   Check publisher's open access policy
ISSN 0022-4596
1095-726X
Publication date 2011-09
Sub-type Article (original research)
DOI 10.1016/j.jssc.2011.07.021
Volume 184
Issue 9
Start page 2458
End page 2461
Total pages 4
Place of publication Maryland Heights, MO, U.S.A.
Publisher Academic Press
Collection year 2012
Language eng
Formatted abstract
Analytical transmission electron microscopy, in particular with the combination of energy dispersive X-ray spectroscopy (EDX) and electron energy-loss spectroscopy (EELS), has been performed to investigate the microstructure and microchemistry of the interfacial region between the cathode (La0.6Sr0.4Co0.8Fe0.2O3, LSCF) and the electrolyte (Gd-doped ceria, GDC). Two types of diffusions, mutual diffusion between cathode and electrolyte as well as the diffusion along grain boundaries, have been clarified. These diffusions suggest that the chemical stability of LSCF and GDC are not as good as previously reported. The results are more noteworthy if we take into consideration the fact that such interdiffusions occur even during the sintering process of cell preparation.

Highlights: ► All the cations in cathode (LSCF) and electrolyte (GDC) can mutually diffuse into each other. ► Diffusing elements will segregate at grain boundaries or triple junctions around the cathode/electrolyte interface. ► Two types of diffusions, the mutual diffusion and diffusion along grain boundaries, have been clarified thereafter.
Keyword Grain boundary
Interdiffusion
Interface
Scanning transmission electron microscopy
Segregation
Solid oxide fuel cell
Oxide fuel-cells
Electrolyte-anode interface
Doped ceria electrolytes
Grain-boundary
Microstructure
Segregation
Cathodes
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

 
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