Abstract
The possibility of achieving self-humidified operation of a polymer electrolyte membrane fuel cell, without any major modifications to the conventional fuel cell design, is investigated experimentally. The flow distributor is designed such that the non-uniform under-rib convection aids to retain product water in the fuel cell enabling a dry feed operation. The fuel cell is operated in a pseudo co-flow and pseudo counter flow modes at a constant current density and the transient change in voltage and temperature are recorded. In the pseudo co-flow mode, the voltage drops at higher temperature and reactant stoichiometries which is attributed to membrane dehydration at the inlet region of the cell. In the pseudo counter-flow mode, the voltage remains same at both low and high temperature operation and is found to be independent of reactant stoichiometry. A horizontal orientation of the flow field, in pseudo counter flow mode, is found to be ideal for self-humidified operation at low reactant stoichiometries and cell temperature.
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