In this work, an air cooled 100W stack was designed, manufactured and tested. The bipolar plates were manufactured by CNC machining of graphite. Membrane electrode assemblies (MEAs) were produced by spraying catalyst ink onto the gas diffusion layer (GDL). A fuel cell stack was assembled with 20 cells each having 12.25 cm~2 active area. The test was carried Qut with H_2 at anode and air at cathode side both at 100% relative humidity having 1.2 and 2 stoichiometric ratios, respectively. The operating temperature of the stack was kept at 60°C during the test. The results indicated that the stack has a maximum power of 60W at 12V operation. Cell numbers 1, 2, 3 and 20 always had less potential than the 0.6V average cell voltage. Uniform cell voltage distribution has been achieved by improving thermal management and reactant distribution.
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