Direct methanol fuel cell system and operating method thereof

摘要

A direct methanol fuel cell system includes a fuel cell main body including at least one membrane-electrode assembly having an electrolyte membrane, and an anode and a cathode positioned on opposite sides of the electrolyte membrane; a fuel-supplying unit feeding a mixing tank with high concentration fuel; the mixing tank mixing and storing the fuel fed from the fuel-supplying unit and an outlet stream discharged from the fuel cell main body; a fuel feeder supplying mixed fuel stored in the mixing tank to the fuel cell main body; and a controller controlling the fuel-supplying unit to stop operating in response to a stop request signal, and controlling the fuel feeder to operate to circulate the mixed fuel via the anode of the fuel cell main body until a fuel concentration of the mixed fuel is less than or equal to a reference concentration.