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

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

Research output: Contribution to journalArticle

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Abstract

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.

Original languageEnglish
Pages (from-to)1125-1131
Number of pages7
JournalJournal of Materials Science
Volume36
Issue number5
DOIs
Publication statusPublished - Mar 1 2001

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Solid oxide fuel cells (SOFC)
Perovskite
Oxides
Electrolytes
Ions
Chemical analysis
Doping (additives)
Ionic conductivity
Partial pressure
perovskite
Oxygen
Temperature
Electric Conductivity

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering

Cite this

Oxide ion conductivity in La0.8Sr0.2Ga0.8Mg0.2-xNix O3 perovskite oxide and application for the electrolyte of solid oxide fuel cells. / Ishihara, Tatsumi; Shibayama, T.; Nishiguchi, H.; Takita, Y.

In: Journal of Materials Science, Vol. 36, No. 5, 01.03.2001, p. 1125-1131.

Research output: Contribution to journalArticle

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abstract = "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.",
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AU - Takita, Y.

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N2 - 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.

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