Superstructure formation and variation in Ni-GDC cermet anodes in SOFC

Li, Zhi-Peng, Mori, Toshiyuki, Auchterlonie, Graeme John, Zou, Jin and Drennan, John (2011) Superstructure formation and variation in Ni-GDC cermet anodes in SOFC. Physical Chemistry Chemical Physics, 13 20: 9685-9690. doi:10.1039/c1cp20296k

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Author Li, Zhi-Peng
Mori, Toshiyuki
Auchterlonie, Graeme John
Zou, Jin
Drennan, John
Title Superstructure formation and variation in Ni-GDC cermet anodes in SOFC
Journal name Physical Chemistry Chemical Physics   Check publisher's open access policy
ISSN 1463-9076
Publication date 2011-05
Sub-type Article (original research)
DOI 10.1039/c1cp20296k
Volume 13
Issue 20
Start page 9685
End page 9690
Total pages 6
Place of publication Cambridge, U.K.
Publisher Royal Society of Chemistry
Collection year 2012
Language eng
Formatted abstract
The microstructures and spatial distributions of constituent elements at the anode in solid oxide fuel cells (SOFCs) have been characterized by analytical transmission electron microscopy (TEM). High resolution TEM observations demonstrate two different types of superstructure formation in grain interiors and at grain boundaries. Energy-filtered TEM elemental imaging qualitatively reveals that mixture zones exist at metal–ceramic grain boundaries, which is also quantitatively verified by STEM energy dispersive X-ray spectroscopy. It was apparent that both metallic Ni and the rare-earth elements Ce/Gd in gadolinium-doped ceria can diffuse into each other with equal diffusion lengths (about 100 nm). This will lead to the existence of mutual diffusion zones at grain boundaries, accompanied by a change in the valence state of the diffusing ions, as identified by electron energy-loss spectroscopy (EELS). Such mutual diffusion is believed to be the dominant factor that gives rise to superstructure formation at grain boundaries, while a different superstructure is formed at grain interiors, as a consequence solely of the reduction of Ce4+ to Ce3+ during H2 treatment. This work will enhance the fundamental understanding of microstructural evolution at the anode, correlating with advancements in sample preparation in order to improve the performance of SOFC anodes.
Keyword Oxide fuel cells
Energy loss spectroscopy
Doped ceria
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

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