| 摘要 |
PROBLEM TO BE SOLVED: To stably operate a fuel cell for a long duration by preventing wetting of the end face of a separator inserted between neighboring fuel cell layered bodies with phosphoric acid and eliminating corrosion of the separator by phosphoric acid and possibility of leakage of the electrolytic solution between neighboring unit cells. SOLUTION: A unit cell 1 comprises a matrix 2 holding phosphoric acid and sandwiched between a fuel electrode catalytic layer 3 and an air electrode catalytic layer 4, a fuel electrode porous plate 5 holding phosphoric acid in the outer face of the layer 3, and an air electrode porous plate 6 in the outer face of the layer 4. This phosphate fuel cell layered body is so constituted by layering such unit cells 1 while inserting separators 9A into the neighboring unit cells as to give electric energy by electrochemical reaction by supplying a fuel gas to the fuel electrode catalytic layers 3 and an oxidizing gas to the air electrode catalytic layers 4. In this case, the end parts of the outer circumferential sides of the separators 9A are provided with water-repelling parts 10 formed by impregnating the end parts with polytetrafluoroethylene and sintering the resultant end parts. |
