Electrochemical measurement of the oxygen diffusivity and solubility in concentrated alkaline media on rotating ring-disk and disk electrodes - application to industrial chlorine-soda electrolyte
M. Chatenet et al., Electrochemical measurement of the oxygen diffusivity and solubility in concentrated alkaline media on rotating ring-disk and disk electrodes - application to industrial chlorine-soda electrolyte, ELECTR ACT, 45(17), 2000, pp. 2823-2827
The measurement of oxygen transit time from the disk to the ring of a rotat
ing ring-disk electrode has been used for the oxygen diffusivity determinat
ion. The oxygen solubility has then been deduced from the limiting current
measure in quasi-steady state oxygen reduction voltammetry. The method vali
dation has been done for a 1 M NaOH solution at 25 degrees C. Its use in th
e case of industrial electrolytes, 11.1 M (33 wt.%) NaOH at 25 and 80 degre
es C for which no literature data are available, has then been undertaken;
the oxygen solubility is 72 times smaller than in 1 hi soda at 25 degrees C
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