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cience form e 2 F l (DM designed, fabricated and tested with different methanol concentrations. It was found that the cell performance was improved sub-stantially with an increase in methanol concentration; a maximum of power density of 20 mW/cm2 was achieved with 5.0 M meth-anol solution. The measurements indicated that the better performance with higher methanol concentrations was mainly attributed the world because its system is simple (without reform- companies including Motorola, Toshiba, Samsung, the cathode, which causes a mixed potential on the cath-ode and thus reduces the overall cell voltage. For this reason, one of the most important parameters that affect the performance of DMFCs is methanol concentration, which has been widely studied. In an active DMFC wit