Resistance Separation of Polymer Electrolyte Membrane Fuel Cell by Polarization Curve and Electrochemical Impedance Spectroscopy

The separation of resistances during their measurement is important because it helps to identify contributors in polymer electrolyte membrane (PEM) fuel cell performance. major methodologies for separating the are electrochemical impedance spectroscopy (EIS) and polarization curves. In addition, an equivalent circuit was selected EIS analysis. Although PEM cells has been extensively studied, less attention paid resistances, including protonic resistance cathode catalyst layer (CCL). this study, curve analyses were conducted separate considering charge transfer resistance, mass transport high frequency CCL. A general solution mathematically derived using recursion formula. Consequently, separated analyzed with respect variations relative humidity entire current density region. case ohmic almost constant main operating load range (0.038–0.050 Ω cm2), while CCL exhibited sensitivity (0.025–0.082 cm2) owing oxygen diffusion water content.