Electrochemical window of molten LiCl-KCl-CaCl2 and the Ag+/Ag reference electrode

The electrochemical window of an LiCl-KCl-CaCl2 eutectic melt (52.3:11.6:36.1 mol%) was determined by cyclic voltammetry and open-circuit potentiometry at 723-873 K. The reaction at the anodic limit was confirmed to be Cl2 gas evolution. The reaction at the cathodic limit was found to be a liquid Ca-Li alloy formation on the basis of ICP analysis of the deposits. An Ag+/Ag reference electrode separated with a Pyrex membrane showed good stability for more than 1 week. The standard electrode potential of Ag+/Ag was determined in the temperature range of 723-823 K by measuring the potential of a silver electrode in different concentrations of Ag+ ions.