NaCl-KCl-LaCl_(3)熔盐La^(3+)在钨电极上电化学还原  

Electrochemical Reduction Mechanism of La^(3+) on the Tungsten Electrode in NaCl-KCl-LaCl_(3) Molten Salt

作　　者：张晓虎 黄晶明 田亚斌 叶昌美 杨少华[1] ZHANG Xiao-hu;HUANG Jing-ming;TIAN Ya-bin;YE Chang-mei;YANG Shao-hua(Department of Material Metallurgy and Chemistry,Jiangxi University of Science and Technology,Ganzhou 341000,China)

机构地区：[1]江西理工大学材料冶金化学学部,江西赣州341000

出　　处：《稀土》2021年第3期73-78,共6页Chinese Rare Earths

基　　金：国家自然科学基金项目(51664022)。

摘　　要：采用NaCl-KCl作为电解质体系,以LaCl_(3)作为原料,控制温度在1073 K时,采用循环伏安法(CV)、方波伏安法(SWV)、计时电位法(CP)等电化学研究方法来研究在钨电极上La^(3+)的电化学行为。研究结果表明,镧离子在钨电极上的电化学还原反应是一步转移三个电子,电极反应式为La^(3+)+3e→La;计时电流以及循环伏安均可证明镧离子在钨电极上的还原过程受扩散控制,扩散系数为6.87×10^(-5) cm^(2)·s^(-1)。The electrochemical behavior of La^(3+) on tungsten electrode was studied by cyclic voltammetry, square wave voltammetry and chronopotentiometry with NaCl-KCl as electrolyte system and LaCl_(3) as raw material at 1073 K. The results show that the electrochemical reduction of La^(3+) on tungsten electrode is a one-step transfer of three electrons, and the electrode reaction formula is La^(3+)+3 e→La. The reduction process of lanthanum ion on tungsten electrode is controlled by diffusion, and the diffusion coefficient is 6.87×10^(-5) cm^(2)·s^(-1).

关 键 词：熔盐电解 电化学还原 镧 扩散系数 

分 类 号：TF845.6[冶金工程—有色金属冶金]