Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 3, Issue 7, Pages 2772-2778Publisher
AMER CHEMICAL SOC
DOI: 10.1021/am2005543
Keywords
diffusion; energy-dispersive X-ray spectroscopy; electron energy loss spectroscopy; interface; microstructure; solid oxide fuel cell
Funding
- Ministry of Education, Culture, Sports, and Technology (MEXT), Japan [22310053]
- Global Research Center for Environment and Energy based on Nanomaterials Science (GREEN), National Institute for Materials Science, Japan
- Grants-in-Aid for Scientific Research [22310053] Funding Source: KAKEN
Ask authors/readers for more resources
The microstructure and local chemistry of the interface between the screen-printed La0.6Sr0.4Co0.8Fe0.2O3 (LSCF) thin film cathode and Gd-doped ceria (GDC) electrolyte substrate have been investigated. Elemental distribution analyses, by energy-dispersive X-ray spectroscopy operated in scanning transmission electron microscopy (STEM) mode, illustrate that all constituent elements in GDC and LSCF mutually diffuse across the LSCF/GDC interface, with equal diffusion length. This leads to the formation of mutual diffusion zones at the LSCF/GDC interfaces, with the resultant mixture of diffusing ions being associated with specific valence state changes, as verified by STEM electron energy loss spectroscopy analyses. Moreover, this mutual diffusion can result in microstructural changes, where superstructure formation is accompanied by enhancement of oxygen vacancy ordering at this region. Such mutual diffusion and associated microstructure evolution is considered to be detrimental to fuel cell efficiency and should be suppressed by lowering cell fabrication temperatures.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available