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.
Original language | English |
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Pages (from-to) | 454-459 |
Number of pages | 6 |
Journal | Solid State Ionics |
Volume | 262 |
DOIs | |
Publication status | Published - 2014 Sep 1 |
Keywords
- 10GDC interlayer
- OCV and polarization
- Solid oxide fuel cell (SOFC)
- Sr and Zr diffusion
ASJC Scopus subject areas
- Chemistry(all)
- Materials Science(all)
- Condensed Matter Physics