Gas diffusion-type oxygen electrode using perovskite-type oxides for metal-air batteries
- Kyushu Univ., Kasuga, Fukuoka (Japan)
In order to develop an air cathode of metal-air batteries, oxygen reduction behavior of gas diffusion-type carbon electrodes loaded with perovskite-type oxides, La{sub 1{minus}x}A{prime}{sub x}FeO{sub 3} (A{prime} = Ca, Sr, Ba, 0 {le} x {le} 1.0), was examined in 8 M KOH at 60 C. Among the oxide catalysts tested, La{sub 0.5}Sr{sub 0.5}FeO{sub 3} (specific surface area: 21.5 m{sup 2}{center_dot}g{sup {minus}1}) gave the highest electrode performance. On the basis of electrode reaction kinetics, H{sub 2}O{sub 2} decomposition rates, and temperature programmed desorption of oxygen, it was concluded that such a performance was attributable to the active sites of the oxide for the direct 4-electron reduction of oxygen. Moreover, the electrode using La{sub 0.5}Sr{sub 0.5}FeO{sub 3} was found to be rather stable in a short-term operation for 90 h at 300 mA{center_dot}cm{sup {minus}2}.
- OSTI ID:
- 162907
- Report Number(s):
- CONF-950412--; ISBN 1-55899-296-0
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
36 MATERIALS SCIENCE
BARIUM OXIDES
CALCIUM OXIDES
CARBON BLACK
CATALYSTS
CATHODES
DIFFUSION
EXPERIMENTAL DATA
FABRICATION
HYDROGEN PEROXIDE
IRON OXIDES
LANTHANUM OXIDES
METAL-GAS BATTERIES
NICKEL
PEROVSKITE
POLYTETRAFLUOROETHYLENE
REACTION KINETICS
REDUCTION
SCANNING ELECTRON MICROSCOPY
STRONTIUM OXIDES
SYNTHESIS
X-RAY DIFFRACTION