In the electrochemical processes, an aqueous solution of sulfuric acid (550 to 570 g/L) (Degussa-WeiBenstein Process) or of sulfuric acid (260 g/L) and ammonium sulfate (210 to 220 g/L) (Lowenstein-Riedel Process) is electrochemically oxidized at the anode to peroxodisulfuric acid or ammonium peroxodisulfate respectively and reduced at the cathode producing hydrogen.

Small quantities of ammonium thiocyanate of hydrochloric acid are added to increase the anode potential. The peroxo compound obtained is subsequently hydrolyzed, the hydrolysis proceeding by way of the peroxo- monosulfate. (Caro's acid):

The hydrogen peroxide formed is distilled off, the sulfuric acid or sulfuric acid-ammonium sulfate solutions being recycled. The total yield for both processes relative to the electricity consumed is about 70%.

The disadvantage of the electrochemical processes are the high plant and production costs, due to the high cost of the electricity used.