Abstract
In this chapter, electrochemical impedance spectroscopy (EIS) measurements are carried out in the individual cells of a polymer electrolyte membrane fuel cell (PEMFC) stack. The PEMFC stack consists of cells with open-cathodes. The impedance responses of three electrical circuits reported in the literature are fitted to the impedance spectra of the individual cells of the open-cathode PEMFC stack. The charge transfer resistance and oxygen transport resistance during the redox reaction are estimated from the impedance spectra of the individual cells and the considered electrical circuits. The measured impedance spectra featured inductive loops at low frequencies. An analysis of the electrochemical phenomena that yield the formation of the inductive loops in EIS-PEMFC measurements at low frequencies is carried out as well.
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