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A Numerical Study of Effect of Operating Conditions on Hydrogen Crossover Through Perforated PFSA Membrane


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DOI: https://doi.org/10.15866/iremos.v15i2.22046

Abstract


In this work, a three-dimensional monophasic mass transport PEMFC model has been established in order to investigate the gas pressure distribution and to quantify the hydrogen crossover through the Nafion PEM side. The model is performed using finite element approach under a commercial software platform. The effects of anodic inlet gas pressure and membrane pinhole location have been investigated. In addition, the hydrogen flow rate by permeation and the hydrogen flow rate leak across the pinhole have been estimated at different reaction rate values and pinhole sizes. The results show that the hydrogen crossover distribution is inhomogeneous. It begins with a strong increase in the inlet channel side, and ends with a large decrease in the outlet channel. The effect of variation of inlet gas pressure on hydrogen crossover is stronger in comparison with that due to the variation of pinhole size or functioning temperature, especially in case of high reaction rate. In addition, the presence of pinhole favors a slightly increase in hydrogen flow rate across the membrane at the outlet channel side.
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Keywords


Fuel Cell; Gas Permeability; Gas Crossover; Nafion; Membrane Pinhole

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References


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