Kota SHIMIZU
Mixed Ionic Electronic Conduction in the Layered Bismuth Cupper Oxide
Kazunori SATO
The mixed oxide-ionic and electronic conduction of the layered bismuth copper oxide, has been examined as a possible cathode material of solid oxide fuel cells (SOFC). The layered crystal structure of Bi2201(Bi2Sr2-XLaXCuO6+¦Ä), which consists of an alternate stacking of the BiO double layer and the CuO6 layer coordinated with Sr2+ and La3+ ions, showed a mixed conducting behavior in the temperature range between approximately 650¡î to 850¡î. The electrochemical properties of Bi2201 have been investigated by measuring the electromotive force (EMF) for an oxygen concentration cell. The temperature dependence of the EMF showed that the mixed conduction is related to the stability of the crystal structure and the oxygen content in Bi2201. The electrical conductivity of Bi2201 is higher than that of a conventional cathode material, LSM (LaSrMnO3)
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