Mutual diffusion and microstructure evolution at the electrolyte−anode interface in intermediate temperature solid oxide fuel cell

Li, Zhi-Peng, Mori, Toshiyuki, Auchterlonie, Graeme John, Guo, Yanan, Zou, Jin, Drennan, John and Miyayama, Masaru (2011) Mutual diffusion and microstructure evolution at the electrolyte−anode interface in intermediate temperature solid oxide fuel cell. Journal of Physical Chemistry C, 115 14: 6877-6885. doi:10.1021/jp201105p

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Author Li, Zhi-Peng
Mori, Toshiyuki
Auchterlonie, Graeme John
Guo, Yanan
Zou, Jin
Drennan, John
Miyayama, Masaru
Title Mutual diffusion and microstructure evolution at the electrolyte−anode interface in intermediate temperature solid oxide fuel cell
Journal name Journal of Physical Chemistry C   Check publisher's open access policy
ISSN 1932-7447
1932-7455
Publication date 2011-04-14
Sub-type Article (original research)
DOI 10.1021/jp201105p
Volume 115
Issue 14
Start page 6877
End page 6885
Total pages 9
Place of publication Washington, DC, U.S.A.
Publisher American Chemical Society
Collection year 2012
Language eng
Abstract The microstructure and elemental distribution of the gadolinium-doped ceria (GDC) thin film electrolyte, Ni-GDC cermet anode, and the interface between them were comprehensively characterized by high-resolution transmission electron microscopy (HR-TEM) and energy-dispersive X-ray spectroscopy (EDX) operated in scanning TEM (STEM) mode. HR-TEM observations show newly appeared microstructure (i.e., superstructures) formations at both GDC and metallic Ni grains at the electrolyte−anode interface. STEM-EDX mapping and line scan analyses illustrate that not only can Ni diffuse into GDC grains as previously reported but also Ce and Gd can diffuse into metallic Ni particles with equal diffusion lengths as that of Ni diffusion. Such mutual diffusion is independent of ionic radii and can result in the valence state change of diffusing ions, verified by electron energy loss spectroscopy investigations. Therefore, the mutual diffusion and related microstructural evolutions are elucidated to be dominating factors that lead to the interfacial layer formation between anode and electrolyte, which is identified to have a considerable influence on the ionic conductivity behavior in intermediate temperature solid oxide fuel cells.
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

 
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Created: Mon, 17 Oct 2011, 11:35:58 EST by Professor John Drennan on behalf of Centre for Microscopy and Microanalysis