Type of technology cell Electrolyte Operating Temperature ºc Electrode Catalyst AEC KOH or NaOH 50-100 Nickel-based PEMEC H.P.M 20-100 Platinum/Iridium SOEC Ceramic 500-100 Nickel cement

AEC = Alkaline Electrolyte Cell PEMEC = Proton Exchange Membrane Electrolyser Cell SOEC = Solid Oxide Electrolytic Cell H.P.M = Humidified Polymer Membrane

Table1: Technical data for the technology of cells used in water electrolysis