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Electrochemical Pressure Impedance Spectroscopy for Polymer Electrolyte Membrane Fuel Cells: A Combined Modeling and Experimental Analysis

Abstract : Electrochemical pressure impedance spectroscopy (EPIS) has recently been developed as a potential diagnosis tool for polymer electrolyte membrane fuel cells (PEMFC). It is based on analyzing the frequency response of the cell voltage with respect to an excitation of the gas-phase pressure. We present here a combined modeling and experimental study of EPIS. A pseudo-two-dimensional PEMFC model was parameterized to a 100 cm 2 laboratory cell installed in its test bench, and used to reproduce steady-state cell polarization and electrochemical impedance spectra (EIS). Pressure impedance spectra were obtained both in experiment and simulation by applying a harmonic pressure excitation at the cathode outlet. The model shows good agreement with experimental data for current densities ≤ 0.4 A cm −2 . Here it allows a further simulative analysis of observed EPIS features, including the magnitude and shape of spectra. Key findings include a strong influence of the humidifier gas volume on EPIS and a substantial increase in oxygen partial pressure oscillations towards the channel outlet at the resonance frequency. At current densities ≥ 0.8 A cm −2 the experimental EIS and EPIS data cannot be fully reproduced. This deviation might be associated with the formation and transport of liquid water, which is not included in the model.
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https://hal.univ-lorraine.fr/hal-03614188
Contributor : Stéphane Raël Connect in order to contact the contributor
Submitted on : Monday, May 9, 2022 - 2:49:20 PM
Last modification on : Tuesday, May 10, 2022 - 3:40:44 AM

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Lutz Schiffer, Anantrao Vijay Shirsath, Stéphane Raël, Caroline Bonnet, François Lapicque, et al.. Electrochemical Pressure Impedance Spectroscopy for Polymer Electrolyte Membrane Fuel Cells: A Combined Modeling and Experimental Analysis. Journal of The Electrochemical Society, Electrochemical Society, 2022, 169 (3), pp.034503. ⟨10.1149/1945-7111/ac55cd⟩. ⟨hal-03614188⟩

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