Evidence for the Existence of Stable CO 2 = Ion and Response Time of Gas Electrodes in Molten Alkali Carbonates

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Abstract
Experimental evidence is presented confirming the existence of a previously unknown ion formed by the combination of gas and O= ion at the electrode in molten ternary eutectic, . The new ion is kinetically active and its oxidation to product is responsible for the second of two anodic processes displayed by the electrode in this melt at a half‐wave potential of about +300 mV (standard reference). has a limited solubility in the molten electrolyte and, apparently when , it decomposes to and O= relatively quickly: within 10 sec in the example studied. Perturbations of the standard and 1:2 electrode equilibria by addition of solid to the melt show that: (a) the response of both these electrodes to local concentration changes in the melt is very fast (0.1 sec or faster), (b) the carbonate dissociation equilibrium is slow, and (c) the correct forms of the Nernst equations governing the departures of the potentials of these electrodes from equilibrium are, respectively

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