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

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 cell voltage with respect to an excitation gas-phase pressure. We present here combined modeling and experimental study EPIS. A pseudo-two-dimensional PEMFC model was parameterized 100 cm 2 laboratory installed in its test bench, used reproduce steady-state polarization electrochemical spectra (EIS). Pressure were obtained both experiment simulation by applying harmonic at cathode outlet. The shows good agreement data current densities ? 0.4 ?2 . Here it allows further simulative analysis observed EPIS features, including magnitude shape spectra. Key findings include strong influence humidifier gas volume substantial increase oxygen partial oscillations towards channel outlet resonance frequency. At $\geqslant ? 0.8 EIS cannot be fully reproduced. This deviation might associated formation transport liquid water, which not included model.