Need help with PEM Fuel Cell Modeling using COMSOL

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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?