Mardi 22 novembre 2022 à 11h, Amphithéâtre Hervé Daniel (Bât.670, H. Moissan)
Dr. Amit Bhosale, IIT Roorkee, India (https://www.iitr.ac.in/~HRE/Amit_Bhosale)
"Il nous présentera une conférence intitulée “Contact Resistance Management in Fuel Cell"
Contact resistance at the interface of gas diffusion layer and bipolar plate emerges as one of the major concerns as an electrochemical cell is scaled up. The talk covers the significance of such resistance and the factors that influence the same. The presentation then elaborates on the case of cylindrical polymer electrolyte membrane fuel cells due to their higher volumetric and gravimetric power densities over conventional designs. The effect of a design parameter (clamping pressure) and an operational parameter (gas pressure) on the contact resistance of the cell is further detailed to visualise contact pressure at the interface of the gas diffusion layer and the current collector. It is observed that the contact pressure at the interface is dependent on both clamping as well as gas pressure.
The ohmic resistance of the cell is found to decrease with an increase in current, reaches a minimum, and then increases owing to membrane hydration and dehydration over a gradual increase in the cell temperature. The threshold contact resistance is then calculated to be 33.21 mΩ cm2 based on the minimum ohmic resistance of 100 mΩ. The study highlights the optimum zone where the combination of both clamping and gas pressures can be used to minimize contact resistance.