Collect. Czech. Chem. Commun. 1983, 48, 1956-1962

Effects of two new additives on the initial rate of peroxodisulphate electrosynthesis

Jan Baleja, Martin Kadeřáveka, Hermann Matschinerb and Wolfgang Thielec

a Institute of Inorganic Chemistry, Czechoslovak Academy of Sciences, 160 00 Prague 6, Czechoslovakia
b Martin Luther University, Department of Chemistry, Halle/S., G.D.R.
c VEB Eilenburger Chemie-Werk, Eilenburg, G.D.R.


Two new additives, dipotassium cyanimidodithiocarbonate (DKDK) and 5-thio-2-imido-3,4-disulphazolidine (TIDSAL), were tested for the effect they have on the initial rate of peroxodisulphate ion formation in 5M-H2SO4 solution. The concentrations of the additives ranged from 10-4 to 10-2 mol dm-3. Both substances were found to increase current yields of peroxodisulphates as well as oxygen overpotential on the platinum anode. The additive concentration at which a maximum increase was achieved was about 1 . 10-2 mol dm-3 in both cases. Maximum current yields attained under the applied reaction conditions were, however, somewhat lower than those observed with an optimum addition of SCN-.