Abstract
Abstract The chronopotentiometric behaviour of NaNO3—KNO3 melts made basic with OH−, O22− or electrogenerated O2− has been studied in the temperature range 240–350°C. The anodic curves exhibit two diffusion-controlled steps corresponding to the reactions |;O2−|; — 2 e → 1 2 O2 and NO2− — e → NO2. Oxygen evolution from the melt takes place irreversibly and involves most probably OH− ions. The transfer coefficient of the reaction is 0·5. The product iτ 1 2 of the first step decreases linearly with time due to the transformation of the free, oxidizable |;O2−|; into a bound, inactive form. The rate of disappearance of |;O2−|; has been determined at a number of temperatures; the activation energy of the reaction is 3·42 Kcal/mole.
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