Abstract: Very high yields of ozone are produced in an electrolytic process. As high as 52% current efficiencies are secured in electrolytic cells wherein the electrolyte is water and highly electronegative anions. Anions having a so-called "composite electronegativity" of 17.5 or higher, are utilized in the electrolyte solution. The fluoroanions and in particular, the hexafluoro-anions are especially preferred. The anion producing compounds may be added to the electrolyte either in the acid form or in the form of salts. Electrolysis is carried out at room temperatures or at lower temperatures, e.g. down to the freezing point of water. Preferred anode materials for use in the electrolytic cells are either platinum or lead dioxide, especially lead dioxide in the beta crystalline form. The platinum metals, carbon, or nickel and its alloys maybe used as hydrogen-evolving cathodes.