[PDF] Mass Transfer and GDL Electric Resistance in PEM Fuel Cells


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Mass Transfer and GDL Electric Resistance in PEM Fuel Cells

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Abstract:

Many modeling studies have been carried out to simulate the current distribution across the channel and shoulder direction in a proton exchange membrane (PEM) fuel cell. However the modeling results do not show agreement on the current density distribution. At the same time, no experimental measurement result of current density distribution across the channel and the shoulder direction is available to testify the modeling studies. Hence in this work, an experiment was conducted to separatelymeasure the current densities under the channel and the shoulder in a PEM fuel cell by using the specially designed membrane electrode assemblies. T

he experimental results show that the current density under the channel is lower than that under the shoulder except when the fuel cell load is high. Afterwards two more experiments were carried out to find out the reason causing the higher current density under the shoulder. The effects of the electric resistance of gas diffusion layer (GDL) in the lateral and through-plane directions on the current density distribution were studied respectively. The experimental results show that it is the through-plane electric resistance that leads to the higher current density under the shoulder.

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