Abstract
A reversible graphite oxygen electrode has been found in molten (K-Na)NO 3 eutectic, saturated with sodium peroxide. The measured emf of −1150 ± 5 mV at 503 K vs Ag|Ag + (0.1 m) and its temperature dependence −0.44 mV K −1 are compared with theoretical values, obtained with thermodynamic data. An independent value of the superoxide disproportionation constant K p = (5.3 ± 0.3) × 10 −2 kg atm mol −1 at 503 K has been obtained. Our equilibrium experiments confirm the results of Zambonin et al.
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