In recent years, a renewed interest has emerged in hydrogen fuel cell and water electrolyzer technology, largely driven by continuously lowered costs for intermittent renewable electricity generation via wind and solar technology. Modeling and simulation play a crucial role ixn the design and development of these electrochemical systems. The COMSOL Multiphysics® simulation software helps engineers accurately model, understand, and design fuel cells and electrolyzer systems in a time-and cost-effective manner.