Need help with PEM Fuel Cell Modeling using COMSOL

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The discussion focuses on modeling a Proton Exchange Membrane Fuel Cell (PEMFC) using COMSOL, incorporating transport equations for mass, heat, species, and charge. The user successfully validated their stationary model against a published reference but encountered issues with the dynamic voltage response during validation. Specifically, they expected to simulate an undershoot in voltage when transitioning from lower to higher current density, similar to experimental results. However, the expected dynamic voltage versus time curve was not achieved. The user seeks advice on how to effectively trigger the undershooting in the voltage response.
KATHRYN9801
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I happen to be modelling PEMFC and accounted for various transport equation including mass, heat, species and charge. I was able to validate my stationary model based on a published reference. In validating its voltage dynamic response, I was expecting at a potentiometric conditions that an undershoot will be simulated similar to the experimental dynamic response of the reference study. Unfortunately, I was not able to gain the supposed end expected dynamic voltage vs. time curve. In this regard, does anyone knows how to trigger the undershooting in the volatge response when current is changed from lower to higher current density values?
 

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