The concentrations of the main components of the (Li0.62K0.38)2CO3 melt have been evaluated by the thermodynamic modeling technique, and the Warburg coefficients of electroactive particles as a function of temperature and CO2/O2 gas mixture composition have been calculated. The same dependences of Warburg coefficient and charge transfer resistance were studied on Au cathode using coulostatic technique. It is shown that O2 ions and O2 molecules are the main electroactive species in the melt. Their relative concentration determines which reaction mechanism dominates.
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