The sudden drop in the voltage leve

The sudden drop in the voltage level of the cell is another sign of flooding in PEMFC. The blockage by residual water of the access of reactant gases to the catalyst sites means the electrochemical reaction of the cell will stop. The sharp voltage decline takes placeimmediately after reaching the limiting current density of the cell better known as the cut-off current density. Many experimental studies have demonstrated this behaviour and attempted to extend this cut-off value which can be achieved by introducing advanced water management schemes to the cell.