iElectrochemical Phenomena in the Cathode Impedance Spectrum of PEM Fuel Cells Fundamentals, Modelling, and Applications iestablishes how the electrochemical and diffusion mechanisms of a polymer electrolyte membrane fuel cell PEMFC are related to electrochemical impedance spectroscopy EIS measurements using physics-based impedance models derived from fundamental electrode and diffusion theories. The contribution of the different phenomena occurring at the different layers comprising the cathode on the impedance response of the PEMFC is revealed through EIS-modelling analysis. The relation between EIS measurements and polarisation curves representing the performance of PEMFCs is established. Insight is gained into how the EIS response of the PEMFC changes at different operating conditions e.g. relative humidity, load demand, gas reactant stoichiometry and temperature using physics-based impedance models. The application of impedance models with EIS measurements carried out in the indiv