Abstract
Oxygen transport analysis is of critical importance during surge evolution for fuel cell systems because it is closely related with the safety and performance of the system. However, research has yet been insufficient on oxygen transport analysis to reaction site surface in catalyst layer under surge evolution. In this paper, an agglomerate model is used to investigate oxygen concentration, local current density, and activation over-potential along catalyst layer thickness under surge evolution. The results are validated versus experimental data from our test. Unlike previous analyses of oxygen transport in the catalyst layer, this study presents an analytic dynamic compressor model that is able to examine the various surge phenomenon. In this study, an agglomerate model is introduced and fuel cell system model including a dynamic compressor is implemented to investigate the influence of surge evolution on the cell performance. At the end, fuel cell system model is simulated during Highway Fuel Economy (HWFET) cycle. The results indicate that oxygen concentration at the GDL/CL interface within the range z = 0 μm to z = 3 μm is most strongly affected by surge evolution, and oxygen concentration changes are strongly affected by surge evolution up to z = 3 μm.
Published Version
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