| 摘要 |
PURPOSE:To obtain sufficient durability and generation efficiency by forming an air electrode of perovskite lanthanum composite oxide and specifying each of the conductivity, the gas transmission coefficient, the expansion coefficient and the average cavity size. CONSTITUTION:An air electrode 10 formed of perovskite lanthanum composite oxide has the conductivity of 50s/cm or more, the gas transmission coefficient of 1.0X10<-4>cc.cm/sec(g/cm<2>).cm<2> or more, the expansion coefficient of 10 to 12X10<-6>/k, and the average cavity size of 0.1-50mum. In this way, the air electrode 10 and solid electrolyte 11 are adhered to each other, air or oxygen gas is transmitted through the air electrode 10 and supplied and diffused onto the surface of the solid electrolyte 11 and the air electrode 10 is formed into an anode. Voltage drop inside the air electrode 10 can, however, be prevented. It is thus possible to supply sufficient air or oxygen gas onto the surface of the solid electrolyte 11 for generation, prevent separation from the solid electrolyte 11 and crack thereto and improve durability. |
