| 摘要 |
In a solid oxide fuel cell (SOFC) having a fuel electrode, a solid electrolyte film, and an air electrode, which are stacked, a conductive current-collecting mesh is bonded to a surface (upper surface), opposite to a bonding surface (lower surface) with the solid electrolyte film, of the sheet-like air electrode. Plural "bonding portions" that are bonded to the current-collecting mesh and plural "non-bonding portions" that are not bonded to the current-collecting mesh are present on the upper surface of the air electrode. In the air electrode, regions (regions indicated by fine dots in the figure, dense portion) having a porosity smaller than a porosity of the other region (region indicated as white in the figure, porous portion) are respectively formed on the position in the middle of the thickness of the air electrode from each "bonding portion". The average of the porosity of the dense portion is 20% or more and less than 35%, while the average of the porosity of the porous portion is 35% or more and less than 55%. This structure can provide an SOFC that can simultaneously attain the enhancement in the gas diffusivity in the electrode and the enhancement in the bonding strength of the bonding portion between the electrode and the current-collecting member. |
