Riassunto analitico
The present work outlines a numerical implementation that allows to simulate the Electrochemical Impedance Spectroscopy (EIS) of a Proton Exchange Membrane Fuel Cell (PEMFC) through a fast transient current excitation. It has been realized into a 2D macro-homogeneous model developed at Bosch GmbH with the aim of correctly capturing the underlying electrochemical processes via their governing equations derived from state-of-the-art parametrizations. Considering the challenges related to this task, some parameters difficult to estimate have been tuned by comparing the polarization curves predicted in the simulations with the corresponding experimental ones. The resulting model has been validated and further investigated under strongly different operating conditions. Specifically, the settings of the numerical solvers present in the commercial software employed
have been customized and integrated in a methodology that ensured a robust convergence in all the scenarios considered, thus proving the applicability of the proposed computationally efficient technique. Eventually, a parameter study has been conducted to better understand the implications of specific parameters on the EIS response. Therefore, the discussion proposed here opens up an alternative to equivalent circuits for interpreting impedance spectra, and has the potential to enhance the comprehension of PEMFCs by assessing different parametrizations.
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