Electrochemical Phenomena in the Cathode Impedance Spectrum of PEM Fuel Cells: Fundamentals, Modelling, and Applications establishes 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 individual cells comprising a PEMFC stack is demonstrated, while recent modelling approaches and other impedance models reported in the literature to represent the EIS response of the PEMFC are also considered and discussed.

Part I. Fundamentals of PEM Fuel Cells and EIS
1. Introduction to Electrochemical Impedance Spectroscopy
2. Fundamentals of PEM Fuel Cells
3. Electrochemical Impedance Spectroscopy in PEM Fuel Cells

Part II. Modelling
4. Impedance Model of the Cathode Catalyst Layer
5. Impedance model of the Cathode Electrode
6. Inductive loops at low frequencies of the impedance spectrum

Part III. Modelling Application
7. Electrochemical phenomena represented in the cathodic impedance spectrum
8. Performance analysis in the individual cells of a PEMFC stack through an EIS-Modelling Approach

Appendix.
A.1 Fast Fourier algorithm for validation of EIS data, (Chapter 3)
A.2 Graphic user interface in Matlab® to fit the PEMFC impedance model with EIS measurements (Chapters 7 and 8)

Subject Areas: Petroleum technology [THFP], Energy technology & engineering [TH], Chemical engineering [TDCB]