Transition metal doped LaGaO perovskite fast oxide ion conductor and intermediate temperature solid oxide fuel cell

Tatsumi Ishihara, Takaaki Shibayama, Miho Honda, Hiroyasu Nishiguchi, Yusaku Takita

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)

Abstract

Doping transition metal cation is known to enhance the electric conduction of solid electrolytes, however, the ionic conduction can be improved by doping the small amount of transition metal, in particular, doping Co is effective for improving the oxide ion conductivity. In this investigation, oxide ion conductivity of LaGaO3 based oxide doped with Co were investigated in detail. It was found that LaGaO3 doped with Co for Ga site (LSGMC) show a notable oxide ion conductivity over a wide range of oxygen partial pressures, although a hole conduction was appeared by addition of excess amount of Co. Considering the electrical conductivity and transport number of oxide ion, the optimized composition of LSGMC seems to be existed at La0.8Sr0.2Ga0.8Mg0.115Co 0.085O3. Power generation characteristics of fuel cells was greatly improved by using LSGMC for electrolyte and extremely large power density can be obtained on both H2-O2 and H2-air cells. In particular, the maximum power density was attained to a value of 1.53and 0.50 W/cm2 at 1073 and 873 K, respectively, on H2-O2 cell when the thickness of electrolyte was 0.18 mm. Furthermore, almost similar large power density was attained when air was used as oxidant. The high power density of cell demonstrated in this study suggests that the operating temperature of SOFC can be decreased by using LSGMC for electrolyte.

Original languageEnglish
Pages (from-to)283-294
Number of pages12
JournalMaterials Research Society Symposium - Proceedings
Volume575
Publication statusPublished - 1999
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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