Transition metal doped LaGaO{sub 3} perovskite fast oxide ion conductor and intermediate temperature solid oxide fuel cell
Conference
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OSTI ID:20086892
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 LaGaO{sub 3} based oxide doped with Co were investigated in detail. It was found that LaGaO{sub 3} 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 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 exist at La{sub 0.8}Sr{sub 0.2}Ga{sub 0.8}Mg{sub 0.115}Co{sub 0.085}O{sub 3}. Power generation characteristics of fuel cells was greatly improved by using LSGMC for electrolyte and extremely large power density can be obtained on both H{sub 2}-O{sub 2} and H{sub 2}-air cells. In particular, the maximum power density attained was a value of 1.53 and 0.50 W/cm{sup 2} at 1,073 and 873 K, respectively, on H{sub 2}-O{sub 2} 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 the cell demonstrated in this study suggests that the operating temperature of SOFC can be decreased by using LSGMC for electrolyte.
- Research Organization:
- Oita Univ. (JP)
- Sponsoring Organization:
- New Energy and Industrial Technology Development Organization
- OSTI ID:
- 20086892
- Country of Publication:
- United States
- Language:
- English
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