Hauptseite > Publikationsdatenbank > Performance of a PEM fuel cell with oscillating air flow velocity: A modeling study based on cell impedance > print

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037 _ _ |a FZJ-2021-00306
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100 1 _ |a Kulikovsky, Andrei
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245 _ _ |a Performance of a PEM fuel cell with oscillating air flow velocity: A modeling study based on cell impedance
260 _ _ |a Amsterdam [u.a.]
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520 _ _ |a A model of PEM fuel cell impedance is developed taking into account imposed harmonic perturbation of the air flow velocity in the cathode channel. The flow velocity modulation with the amplitude proportional to AC amplitude of the cell potential lowers the resistivity Rh due to oxygen transport in channel. When relative amplitudes of velocity and potential oscillations are equal, a complete compensation of Rh occurs. This effect explains experimental findings of Kim et al. (https://doi.org/10.1016/j.jpowsour.2008.06.069) and Hwang et al. (https://doi.org/10.1016/j.ijhydene.2010.01.064), who demonstrated significant improvement of PEM fuel cell performance under oscillating air flow velocity.
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