Emulating local operating conditions in Proton Exchange Membrane Fuel Cells

The 37 conditions investigated in this work are therefore emulated using the differential cell. The methodology allows to emulate a wider range of local values of relative humidity, temperature, species concentrations and gas pressure collected for three different areas of the simulated cell (air inlet, middle and air outlet) at the anode and cathode. The 37 different operating con-ditions are referenced in file (Operating_conditions_Cell). For each condition, the polarization curve is measure during the first scan from OCV down to the lower cell voltage, i.e., 0.2 V and Electrochemical Impedance Spectroscopy measurement are done at 3 different currents (45 mA, 180 mA and 900 mA). Each file contains either data from polarization curve or electrochemical impedance spectrum: • Break-in_IV and CX_IV. This file contains the experimental raw data of the polar-ization curve of the operating condition X. All raw data files are organized with the same structure: the first column provides the current density and the second one the corresponding cell voltage; • Break-in_EIS and CX_EIS. This file contains the experimental raw data of the im-pedance spectrum of the operating condition X at low (i.e., 45 mA, 180 mA) or medium current (i.e., 900 mA). All raw data files are organized with the same structure: The first and second columns refer to current density and cell voltage. The columns 3, 4 and five report the frequency, the real(Z) and -Im(Z) respectively. Finally, the columns 6 and 7 give module and the phase angle respectively.