| 摘要 |
PROBLEM TO BE SOLVED: To provide a fuel cell system directly feeding methanol which contributes to the increase of the volume energy efficiency and enhances safety. SOLUTION: The fuel cell system comprises a unit cell 1, a fuel tank 2 and a tank 3 for high concentration methanol. In the unit cell 1 are installed a negative electrode 12 and a positive electrode 13 opposite each other, separated with an electrolyte 11 composed of a proton-conductive polymer film, and a structure for feeding a liquid fuel to the negative electrode 12 and a structure for feeding an oxidizing gas to the positive electrode 13. In the fuel tank 2 is stored a methanol aqueous solution as the liquid fuel to be fed to the unit cell 1. In the tank 3 is stored methanol, to be fed to the fuel tank 2, of a concentration higher than that of the methanol aqueous solution in the fuel tank 2, wherein the high concentration methanol feeding from the tank 3 is so controlled that the methanol concentration of the methanol aqueous solution in the fuel tank 2 agrees with a required concentration. |
