| 摘要 |
PROBLEM TO BE SOLVED: To provide an air electrode material for alkaline earth-added nickel- iron perovskite type low-temperature operating solid fuel cell, which simultaneously satisfies 2 requirements of electric properties and the matching ability of a coefficient of thermal expansion with an electrolyte that are required of an air electrode for a solid fuel cell operating at a temperature of from 700 deg.C down to 600 deg.C. SOLUTION: For the air electrode material represented by the formula, Ln1-YAYNi1-XFeXO3, (wherein, Ln is an element selected from among La, Pr, Nd and Sm, and A is an element selected from among Sr, Ba and Ca), the compositional range thereof falls within X-0.2<=Y<=X-0.4, and 0.55<=X<=0.90. The material has good electrode activity at about 650 deg.C and is excellent in electron conductivity compared with a conventional material, La0.8Sr0.2MnO3 and has almost the same coefficient of thermal expansion as the conventional material. |
