Electrochemical reduction behavior of Hf（IV） in molten NaCI-KCI-K2HfCI6 system

The electrochemical reduction mechanism of hafnium ion（IV） was studied in NaC1-KC1-K2HfC16 melts on a molybdenum electrode. The cyclic voltammetry study shows that Hf（IV） is reduced to hafnium metal in double two-electron process, that is： Hf（IV） ＋ 2e→Hf（II） and Hf（II） ＋ 2e- →Hf, and the electrochem...

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Bibliographic Details
Published in:稀有金属：英文版 2016 (8), p.655-660
Main Author: Xu Liu Yan-Ke Wu Song Chen Bo Song Li-Jun Wang
Format: Article
Language:English
Subjects:
循环伏安法
方波伏安法
熔融
电化学还原机理
系统
还原行为
阿伦尼乌斯
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Summary:The electrochemical reduction mechanism of hafnium ion（IV） was studied in NaC1-KC1-K2HfC16 melts on a molybdenum electrode. The cyclic voltammetry study shows that Hf（IV） is reduced to hafnium metal in double two-electron process, that is： Hf（IV） ＋ 2e→Hf（II） and Hf（II） ＋ 2e- →Hf, and the electrochemical reduction of Hf（IV） pro- cess was diffusion-controlled. The diffusion coefficients were calculated at several temperatures, and the results obey the Arrhenius law. According to the relationship oflnD versus 1/T, the corresponding activation energy was determined to be 158.8 kJ.mol- x. The square wave voltammetry results further confirm the reduction mechanism of hafnium.
ISSN:1001-0521
1867-7185