| 摘要 |
The provision of a solid oxide fuel cell that does not decrease in electrical generation performance even after being run for a long period of time, a manufacturing method therefor, a fuel-cell stack, and a solid oxide fuel-cell device. This solid oxide fuel cell, which has a solid electrolyte layer, an air-electrode layer that contains at least strontium and is formed on one surface of the solid electrolyte layer, and a fuel-electrode layer formed on the other surface of the solid electrolyte layer, with an intermediate layer formed between the solid electrolyte layer and the air-electrode layer, is characterized in that at least part of the intermediate layer contains an element-diffusion prevention layer, said element-diffusion prevention layer comprises a complex oxide containing zirconium and at least one rare-earth element, and after the solid oxide fuel cell is heat-treated in atmosphere for 100 hours at 1,000°C, the element-diffusion prevention layer is between 600 and 2,000 nm thick, inclusive, and exhibits a strontium coverage of 90% or less. |
