KCl-LiCl共晶熔体中Nd^(3+)和Ho^(3+)的电化学行为

Electrochemical Behavior of Nd 3+ and Ho 3+ Ions in LiCl KCl Eutectic Melt

用循环伏安法和恒电流电解后的电位时间曲线法，研究了ＬｉＣｌＫＣｌ熔体中Ｎｄ３＋和Ｈｏ３＋在Ｍｏ电极上的电化学行为。结果表明，Ｎｄ３＋和Ｈｏ３＋在Ｍｏ电极上的还原都为一步３电子可逆过程。其扩散系数分别为：１１３×１０－６和２１４２×１０－５ｃｍ２·ｓ－１（４５０℃），４５０℃下Ｈｏ３＋／Ｈｏ电极对的标准氧化还原电位为２９８７Ｖ（ｖｓ·Ｃｌ／Ｃｌ－１），并讨论了实验值较理论值偏负的原因。

The electrochemical behaviour of Nd 3+ and Ho 3+ ions on molybdenum electrode in LiCl KCl eutectic melts has been studied by cyclic voltammetry and open circuit potentiometry. The results show that the reduction process of Nd 3+ and Ho 3+ ions on molybdenum electrode is one step three electron reversible reaction. The diffusion coefficients of Nd 3+ and Ho 3+ ions are 1 13×10 -6 cm 2·s -1 (450 ℃) and 2 142×10 -5 cm 2·s -1 (450 ℃) respectively. The measured standard electrode potential of Ho 3+ /Ho is 2 987 V(vs.Cl/Cl -). The reason that the experimental value is more negative than the theoretical one is also discussed.