Device Modeling -- Section Preface -- Modeling of PEMFC Catalyst Layer Performance and Degradation -- Catalyst Layer Operation in PEM Fuel Cells: From Structural Pictures to Tractable Models -- Reactor Dynamics of PEM Fuel Cells -- Coupled Proton and Water Transport in Polymer Electrolyte Membranes -- A Combination Model for Macroscopic Transport in Polymer-Electrolyte Membranes -- Analytical Models of a Polymer Electrolyte Fuel Cell -- Phase Change and Hysteresis in PEMFCs -- Modeling of Two-Phase Flow and Catalytic Reaction Kinetics for DMFCs -- Thermal and Electrical Coupling in Stacks -- Materials Modeling -- Section Preface -- Proton Transport in Polymer Electrolyte Membranes Using Theory and Classical Molecular Dynamics -- Modeling the State of the Water in Polymer Electrolyte Membranes -- Proton Conduction in PEMs: Complexity, Cooperativity and Connectivity -- Atomistic Structural Modelling of Ionomer Membrane Morphology -- Quantum Molecular Dynamic Simulation of Proton Conducting Materials -- Morphology of Nafion Membranes: Microscopic and Mesoscopic Modeling -- Molecular-Level Modeling of Anode and Cathode Electrocatalysis for PEM Fuel Cells -- Reactivity of Bimetallic Nanoclusters Toward the Oxygen Reduction in Acid Medium -- Multi-Scale Modeling of CO Oxidation on Pt-Based Electrocatalysts -- Modeling Electrocatalytic Reaction Systems from First Principles.