| 摘要 |
PURPOSE: To evenly supply reaction gas to electrodes, and to obtain high performance in the high current density zone by forming a drainage plate, which feeds reaction gas to each electrode of a unit cell, from the three-dimensional network porous carbon. CONSTITUTION: A positive electrode 2 and a negative electrode 3 are bonded to both sides of a solid polymer electrolyte film 1 so as to form a unit cell 4 of, for example, a hydrogen-oxygen fuel cell. A drainage plate 5 made of porous carbon having three-dimensional network is arranged in both outsides of the unit cell 4, and they are pinched by separators 6 made of gas impermeable glass carbon so as to form a unit cell. At this stage, porosity of the porous carbon having three-dimensional network is set at 50-95%, and a large quantity of reaction gas is supplied to the electrode, and since the drainage plate 5 contacts with the whole of the electrode surface, the reaction gas is evenly supplied so as to improve the cell voltage at a high current density and improve the limit current density. Furthermore, the contact surfaces of the separator 6 and the drainage plate 5 is coated with the conductive coating so as to reduce the internal resistance, and the discharging characteristic is thereby improved. |
