부산대학교 도서관

The electrochemical behavior of Ti3+/Ti electrodes in alkali-chloride melts has been studied using the rotating disk electrode (RDE) technique. The steady state polarization curves and results from the RDE analysis revealed that the cathodic reduction of the Ti3+/Ti electrode in LiCl–KCl eutectic consists of a two-step reduction in which the latter step, corresponding to the reduction of Ti2+ to Ti, is accompanied by the following inverse-disproportionation reaction,2Ti3++Ti→3Ti2+.Comparison of the cathodic behavior of the Ti3+/Ti electrode in LiCl–KCl eut. with that in NaCl–MgCl2–KCl melt indicates that the lower valence Ti2+ is stable in the latter melt where high cathodic current results in a smooth deposit. The diffusion coefficients of Ti2+ in these melts were found to be 4.6×10−10 (LiCl–KCl eut.) and 1.7×10−10 m2 s−1 (NaCl–MgCl2–KCl melt), respectively.