Controlled Potential Coulometry of Metals in Fused Lithium Chloride-Potassium Chloride Eutectic.

Electromotive force series in molten salts

“…The data of Yang and Hudson (59) and Smirnov and Chukreev (46, 47) on beryllium in this melt appears to involve mixed potentials, and hence these potentials are not included. Catón and Freund (7) have redetermined the standard potentials of Cr(III)-Cr(II) and V(III) -V(II) by a controlled-potential coulometric technique and give values of -0.539 ± 0.001 and -0.740 ± 0.001 v., respectively, in good agreement with the values given in Table I. These authors were unable to determine a standard potential for a niobium couple, apparently because anodization of the metal produced a mixture of oxidation states.…”

Electroanalytical Chemistry in Molten Salts—A Review of Recent Developments

“…Chronopotentiometry, (29) a related electro analytical method, possesses some of the same advantages but suffers from the fact that the transition times obtained in molten salts are frequently not well defined, due to double layer charging; the measurements of such transition times usually involve semi-empirical procedures. (30) Controlled-potential coulometry has been used (31,32) for high-precision (better than 1-2%) electroanalytical work in molten salts. Before embarking on controlled-potential coulometry, pertinent electrode potentials and current-potential characteristics must be known.…”

Electrochemistry of zinc, cadmium, and mercury ions in fused AlCl3–NaCl–KCl eutectic

“…Although the method of measuring transition times used throughout this work (26) gave the ratios cited, other measurement techniques gave values closer to 3 for the mercury system. Two similar cases in which mixtures of oxidation states have been produced by electrochemical anodization of metals in fused salts are niobium in fused LiCI-KC1 (27), in which the ratio between Nb(1V) and Nb(II1) concentrations was approximately equal to 3, and zirconium in the same solvent, in which the proportion of Zr(I1) and Zr(1V) obtained is temperature dependent (28).…”