Bayat, M.Kayfeci, M.2024-09-292024-09-292023978-044319017-9978-044319018-6https://doi.org/10.1016/B978-0-443-19017-9.00012-Xhttps://hdl.handle.net/20.500.14619/9600This chapter introduces a three-dimensional (3D) thermal model of a PEM fuel cell (PEMFC) to determine its performance characteristics and comprehensively discuss the mass transfer within the cell. In this study, a steady-state and isothermal model has been adopted to describe the multiphysics of a single-phase flow. In addition, the transport phenomena in the gas flow channels, gas diffusion layers (GDLs), and gas diffusion electrodes (GDEs), along with electrochemical currents in the GDLs, the GDEs, and the electrolyte membrane, have been considered. In this proposed model, the molar fractions of reactants and water along a single channel and the variation of electrolyte voltages, velocity profiles, and pressure gradients are analyzed and discussed for different operating temperatures from 323.15 to 353.15K. Accordingly, the maximum power density varies between 0.542 and 0.572W/cm2, whereas the optimum net output voltage varies between 0.537 and 0.581V in the same temperature range. © 2023 Elsevier Inc. All rights reserved.eninfo:eu-repo/semantics/closedAccessCOMSOLIsothermal modelPEMFCPerformance assessmentSingle-phaseThree-dimensionalBook Part10.1016/B978-0-443-19017-9.00012-X2-s2.0-85176842004482N/A467