Oxygen permeation properties of Co-free perovskite-type oxide membranes based on BaFe 1-yZr yO 3-δ

Ken Watanabe, Daisuke Takauchi, Masayoshi Yuasa, Tetsuya Kida, Kengo Shimanoe, Yasutake Teraoka, Noboru Yamazoe

研究成果: Contribution to journalArticle査読

65 被引用数 (Scopus)

抄録

Partially Zr-substituted BaFe 1-yZr yO 3-δ membranes were developed as a Co-free oxygen permeable membrane. In order to stabilize the cubic perovskite structure, Fe sites in BaFeO 3-δ were partially substituted with Zr 4+. In the substitution range of y=0.01-0.1, the cubic perovskite structure was stabilized even at room temperature. Among the membranes prepared, a BaFe 0.975Zr 0.025O3 material (y=0.025) showed the highest oxygen permeation flux of 1.30 cm3 (standard temperature pressure) min-1 cm-2 at 930°C under an air/He gradient. The oxygen permeation flux was higher than that of partially Ce-substituted BaFe 1-yCe yO 3-δ membranes reported previously. From the results obtained by chemical and scanning electron microscope analyses, it appears that the oxygen permeability for BaFe 1-yZr yO 3-δ membranes was well correlated with the amount of oxygen defects in the lattice as well as the grain size. In addition, the oxygen permeation flux of the BaFe 0.975Zr 0.025O3 membrane was significantly increased after decreasing the thickness of the membrane from 2.0 to 0.4 mm. For thin membranes (0.4-1.0 mm), the thickness dependence of the oxygen permeability deviated from the Wagner equation, suggesting that the oxygen permeation of BaFe 0.975Zr 0.025O3 is controlled by not only bulk diffusion of oxide ions but also their surface reactions.

本文言語英語
ジャーナルJournal of the Electrochemical Society
156
5
DOI
出版ステータス出版済み - 4 8 2009

All Science Journal Classification (ASJC) codes

  • 電子材料、光学材料、および磁性材料
  • 再生可能エネルギー、持続可能性、環境
  • 凝縮系物理学
  • 表面、皮膜および薄膜
  • 電気化学
  • 材料化学

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