| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 7746438 | Solid State Ionics | 2014 | 6 Pages |
Abstract
To accurately evaluate the role as diffusion barrier of gadolinia-doped ceria (GDC) interlayer, often used in real stacks of solid oxide fuel cells, the cation diffusion behavior in a LSCF/GDC/YSZ system was investigated. Diffusion under open circuit voltage (OCV) and cathodic polarization conditions was evaluated using pellet-type cells in which a dense GDC interlayer, about 1 μm in thickness, was prepared by pulse laser deposition (PLD). Results clearly show that under polarization, SrZrO3 formation along both LSCF/GDC and GDC/YSZ interfaces is accelerated. The enhancement of Sr diffusion during cathodic polarization is explained by a shift to higher values of the thermodynamic activity of Sr at the LSCF/GDC interface that also leads to a decrease in oxygen potential.
Keywords
Related Topics
Physical Sciences and Engineering
Chemistry
Electrochemistry
Authors
Fangfang Wang, Manuel E. Brito, Katsuhiko Yamaji, Do-Hyung Cho, Mina Nishi, Haruo Kishimoto, Teruhisa Horita, Harumi Yokokawa,