Author/Authors :
Wang، نويسنده , , Fangfang and Brito، نويسنده , , Manuel E. and Yamaji، نويسنده , , Katsuhiko and Cho، نويسنده , , Do-Hyung and Nishi، نويسنده , , Mina and Kishimoto، نويسنده , , Haruo and Horita، نويسنده , , Teruhisa and Yokokawa، نويسنده , , Harumi، نويسنده ,
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 :
Sr and Zr diffusion , 10GDC interlayer , Solid oxide fuel cell (SOFC) , OCV and polarization
