Sr and Zr diffusion in LSCF/10GDC/8YSZ triplets for solid oxide fuel cells (SOFCs)

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

研究成果: Article査読

107 被引用数 (Scopus)

抄録

In this work we attempt to give solution to apparently inconsistent results on grain boundary diffusion of Sr in 10GDC that we have found in our earlier diffusion experiments. The emphasis is placed on using of diffusion triplets: LSCF(porous)/10GDC(dense)/8YSZ(dense) that reproduce the driving forces for Sr diffusion found in solid oxide fuel cell (SOFC) real systems. The diffusion triplets were annealed at 1100 and 1200 C for one week. Detailed analyses of the microstructure and elemental distributions unequivocally demonstrate the SrZrO3 formation along both the LSCF/10GDC and the 10GDC/8YSZ interfaces as the result of strontium and zirconium counter directional grain boundary diffusion through the 10GDC interlayer. Furthermore, micro-cracks in the 10GDC interlayer, formed during pre-annealing of the 10GDC/8YSZ layers, were also found to contribute to the SrZrO3 formation via surface diffusion. Thermodynamic considerations taking in account these microstructural features successfully explain, in terms of the chemical potential gradients developed across the 10GDC layer, why SrZrO3 is formed along both interfaces when grain boundary diffusion, or surface diffusion (along crack walls), become dominant compared to bulk diffusion through the 10GDC.

本文言語English
ページ(範囲)281-289
ページ数9
ジャーナルJournal of Power Sources
258
DOI
出版ステータスPublished - 2014 7月 15

ASJC Scopus subject areas

  • 再生可能エネルギー、持続可能性、環境
  • エネルギー工学および電力技術
  • 物理化学および理論化学
  • 電子工学および電気工学

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