Modeling and simulation of PEMFC stack dynamic performance

This paper builds a SIMULINK model about the dynamic performance of the PEMFC System based on the basic mass transport theory and electrochemistry principles. This model integrates the dynamics process of GDL and membrane. Different from other models, considering the dynamics process in the GDL, catalyst oxygen concentration is directly used to describe the concentration overpotential, which is different from traditional expression. The simulation of the model illustrates, the dynamic character of the PEM has great influence on the dynamic performance of the PEMFC voltage. The internal microstructural state of the GDL affects its dynamic performance seriously, whose change can make GDL's response time varies from tens of milliseconds to several seconds, aggravating dynamic oxygen starvation. This model can be used to design the optimal path of the excess oxygen ratio and cathode backpressure's change, in order to solve the dynamic oxygen starvation problem.