In Situ Production of Ozone in Water Using a Membrel Electrolyzer

The application of solid polymer electrolyte or Membrel water electrolysis cells with anodes for anodic generation of ozone in electrolyte‐free water is reported. Maximum yields were obtained at a temperature of 25°–30°C and a current density of 1.0–1.3 Acm −2 . The current efficiency was not found to depend on ozone concentration in the feed water. Both, the perfluorinated membrane and the anode do not show any degradation of performance after 2500h of operation. The excellent stability and performance of the cell are correlated with properties of the membrane and its interface with the anode: exclusive transference of electric current by protons; absence of convection in the electrolyte; high oxygen oversaturation in the vicinity of the electrode.