M. Rudolf et al., CATHODIC REDUCTION OF HYPOCHLORITE DURING REDUCTION OF DILUTE SODIUM-CHLORIDE SOLUTION, Journal of Applied Electrochemistry, 25(2), 1995, pp. 155-165
Sodium chloride solutions of concentration 15 and 30 g dm(-3) were ele
ctrolysed in a flow-through electrolyser with a titanium/TiO2/RuO2 ano
de at current densities 1059-4237 A m(-2). The current yield for the r
eduction of hypochlorite on a stainless steel cathode was found to be
13-32% at 7 g dm(-3) NaClO, in agreement with that calculated on the b
asis of the Stephan-Vogt theory. Migration of ions was taken into acco
unt, the diameter of hydrogen bubbles was set equal to 0.04mm and the
coverage of the electrode with the bubbles was estimated as =theta 0.8
97. The results of calculations show that the reduction rate of hypoch
lorite at low NaCl concentrations is lowered by migration. Literature
data for the reduction of hypochlorite are in accord with the current
yield calculated on the basis of the Stephan-Vogt theory using theta =
0.787 and theta = 0.949.