Abstract
Water management is an essential problem to achieve PEFC’s maximum performance. Hydrogen circulation is one of the methods to humidify the cell with water produced in oxygen reduction reaction (ORR), while the overall hydrogen utilization can be 100%. Additionally, by controlling the operating conditions, such as gas flow direction, one-pass conversion, and humidifying temperature, the cell performance can be improved. Water transport distribution along the gas channel was analyzed by numerical simulation, and the competition of the proton transfer resistance, the oxygen transfer resistance, and the reaction resistance were discussed quantitatively. The results indicate that the countercurrent mode attains better performance due to higher moisture content at high humidification conditions, and the co-current mode can be chosen at low humidification condition. The one-pass conversion higher than 0.30 is required to humidify the cell sufficiently.
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