Proton Exchange Membrane (PEM) fuel cell system with hydrogen storage, pressure regulation, and electrochemical conversion to electrical power. Hydrogen flows through the anode where it oxidizes to protons and electrons, while compressed air enters the cathode for oxygen reduction, with protons transported across the PEM membrane. Electrons travel through an external circuit to power electronics that condition DC output for electrical loads, while water and heat byproducts are managed through recovery and cooling subsystems. This diagram illustrates the complete thermodynamic and electrochemical process chain essential for designing efficient, reliable fuel cell powertrains. Fork and customize this architecture on Diagrams.so to model your specific fuel cell stack, thermal management, or hydrogen supply requirements.