Question: Calculate the limiting current density for a fuel cell cathode running on dry air at STP . Assume thatthe diffusion layer is 5 0 0

Calculate the limiting current density for a fuel cell cathode running on dry air at STP. Assume thatthe diffusion layer is 500 m thick and has a porosity of 40% and a tortuosity of 1.5. Kindly show detailed calculations and especially how to calculate the concentration at STP.
The final answer is 3.4 A/cm^2

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