Study on the flooding phenomena and performance enhancement of PEM fuel cell applying a Concus-Finn condition

The Polymer Electrolyte Membrane Fuel Cell produces electric energy, heat and water during its operation. Therefore, the management of the heat and water produced by PEMFC has become a critical issue of study. The flooding phenomenon in the cathode channel causes concentration loss at high current density, and this loss suddenly decreases the fuel cell efficiency. Current research on the water management of the PEMFC mostly investigates the flooding phenomenon, itself, in the cathode channel. This research presents the optimized design of the channel by studying the flooding phenomenon in the PEMFC under the Concus-Finn condition and the performance improvement by using computational simulation. A new water removal method applying a Concus-Finn condition is presented. The prevention of flooding in the cathode channel of the PEMFC is investigated by visualization experiments, simulations and performance experiments for various reactant RH value and channel shapes under the Concus-Finn condition. Based on the results, a new channel shape that can prevent flooding in the PEMFC is proposed.

► In this study, we suggested the method to effectively eliminate the flooding effect that happened when the fuel cell was in operation. Since the flooding phenomenon inside the channel is removed without any additional equipment, the suggested method can be applied to all types of fuel cells.