Direct methanol fuel cell (dmfc)

(57) Summary book invention relates to DMFC to which the evaporator was connected in front of the battery. The fuel which contains the additive of inactive gas depending on the case and which is mainly methanol / water mixture is variable in the composition, and an inactive gas * mixture can be adjusted depending on load depending on each methanol / water, and the case in that case. Furthermore, the present invention relates to the method of DMFC of operation that fuel exists in anode space by the shape of gas.