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A new structure called Membrane-Electrode-Assembly-Plate unit with lateral hydrogen tube is developed, which binding the periphery of the anode face of a bipolar plate with the periphery of the anode side of a membrane electrode assembly by using silicone adhesive. An air-cooled proton exchange membrane fuel cell stack is assembled through stacking forty Membrane-Electrode-Assembly-Plate units and mounting two hydrogen external manifolds. Consequently, the possibility of hydrogen leakage to the cathode side is excluded completely. The maximum power can temporarily reach 351.60 W at 20.0 A. Eight-hour stack stability is tested at a constant current of 4.77 A, i.e., 100 mAcm. The average voltage drop rate of single cell is calculated as 0.852 mVh. It is explained that the rapid stack voltage drop during eight-hour operation is caused by the formation, accumulation and spread of liquid water inside both the anode and cathode gas diffusion layers and is reversible.

Analysis on the Rapid Voltage Drop Based on a New Air-Cooled PEMFC Stack Design