Oxide ion conductivity in La0.8Sr0.2Ga0.8Mg0.2-xNix O3 perovskite oxide and application for the electrolyte of solid oxide fuel cells

T. Ishihara, T. Shibayama, H. Nishiguchi, Y. Takita

研究成果: ジャーナルへの寄稿学術誌査読

61 被引用数 (Scopus)

抄録

Although hole conduction was present, it was found that doping with Ni was effective in improving the oxide ion conductivity in La0.8Sr0.2Ga0.8Mg0.2O3 based perovskite oxides. Considering the ionic transport number and the electrical conductivity, the optimized composition for Ni doped samples was La0.8Sr0.2Ga0.8Mg0.13 Ni0.07O3 (LSGMN). In t composition, electrical conductivity was found to be virtually independent of the oxygen partial pressure from 1 to 10-21 atm. Consequently, the oxide ion conductivity was still dominant in this optimized composition. In agreement with the improved oxide ionic conductivity, the power density of the solid oxide fuel cell using LaGaO3 as an electrolyte increased by doping with a small amount of Ni on the Ga site. In particular, the power density of 224 mW/cm2 at 873 K, which is the maximum power density in the cells using LaGaO3 based oxide as the electrolyte, was attained using LSGMN in spite of the use of electrolyte plates with a thickness of 0.5 mm. Therefore, LSGMN is highly attractive for the electrolyte material of low temperature operating SOFCs.

本文言語英語
ページ(範囲)1125-1131
ページ数7
ジャーナルJournal of Materials Science
36
5
DOI
出版ステータス出版済み - 3月 1 2001
外部発表はい

!!!All Science Journal Classification (ASJC) codes

  • 材料科学(全般)
  • 材料力学
  • 機械工学

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