The water content of a fuel cell is crucial to performance, as are resistance values. This project studied a PEM fuel cell under varied feed flow rates and hydrogen concentrations, while imposing a current between 0.12 A/cm2 and 0.36 A/cm2. Fuel cell performance was analyzed through a water balance and Galvano Electrochemical Impedance Spectroscopy. Results showed that the charge transfer resistance decreases as current density increases; lower concentrations of hydrogen feed gas result in higher anode resistances but do not affect cathode resistance; net water flow is from the cathode to the anode; 50% and 100% hydrogen feed cause flooding unless the stoichiometric ratio is raised; lower hydrogen concentrations reduce flooding; and the two theoretical models accurately represent the data.
Worcester Polytechnic Institute
Major Qualifying Project
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