High Surface Area Carbon black (Ketjenblack EC-300) is used as catalyst support in the anode and cathode electrodes of electrolyzers or fuel cells. Ketjenblack is a material with an intrinsic resistivity of about 0.01 - 0.1 [Ω·cm]. Ketjenblack is mostly available as pellets of around 3 mm. They are produced with the furnace process, where oil related streams undergo an incomplete combustion in an oven at drastic conditions.