Operating Characteristics 5W Class DMFC Stack for Mobile Devices

We have developed very small direct methanol fuel cell stack for mobile devices. The stack was designed with the total size of 48 mm × 50 mm × 17 mm (volume: ~ 40.8 cc) and it consisted of 6 cells and each cell has an active area of 13.7 cm2. The maximum power output of the stack is 7.63W (1.81V @ 4.22A) and the nominal power output of the stack was 5.49W (2.4V @ 2.29A) at 2.4V (0.4 V/cell). In this work, we studied starting characteristics of 5W class small DMFC stack and effects of methanol/air stoichiometry on the stack performance at constant current.