Electrolysis has long been the preferred way to produce clean hydrogen. Until now, it is performed in electrolyzers that use diaphragms (alkaline) or membranes (PEM and SOEC) to keep separated the areas of hydrogen and oxygen reactions. However, recently a new variant of electrolysis has emerged, which does not involve the use of physical separators. These are membraneless electrolyzers, where the only thing that keep separated hydrogen from oxygen inside the cell is the fluid dynamic forces generated by the design and operation of the cell. This has direct repercussions on the investment cost since a membrane or a diaphragm is eliminated.