Effect of polarization on Sr and Zr diffusion behavior in LSCF/GDC/YSZ system

Fangfang Wang, Manuel E. Brito, Katsuhiko Yamaji, Do Hyung Cho, Mina Nishi, Haruo Kishimoto, Teruhisa Horita, Harumi Yokokawa

Research output: Contribution to journalArticlepeer-review

62 Citations (Scopus)

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 languageEnglish
Pages (from-to)454-459
Number of pages6
JournalSolid State Ionics
Volume262
DOIs
Publication statusPublished - 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

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