Proton exchange membrane (PEM) electrolyzers are considered as one of the most promising hydrogen production technologies. A PEM electrolysis cell consists of two electrodes sandwiching a proton-conducting electrolyte (as the name indicates). These three components, the anode, electrolyte, and cathode, and assembled into a single unit known as a membrane electrode assembly (MEA). PEM electrolyzers are also known as solid polymer electrolyzers (SPE) due to the fact that a solid electrolyte is being used.