Electrochemical reduction behavior of Hf（Ⅳ） in molten NaCl–KCl–K2HfCl6 system
来源期刊：Rare Metals2016年第8期
论文作者：Xu Liu Yan-Ke Wu Song Chen Bo Song Li-Jun Wang
文章页码：655 - 660
摘 要：The electrochemical reduction mechanism of hafnium ion（Ⅳ） was studied in NaCl–KCl–K2HfCl6 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） process was diffusion-controlled. The diffusion coefficients were calculated at several temperatures, and the results obey the Arrhenius law. According to the relationship of lnD versus 1/T,the corresponding activation energy was determined to be 158.8 kJ ·mol-1. The square wave voltammetry results further confirm the reduction mechanism of hafnium.
Xu Liu1,2，Yan-Ke Wu1，Song Chen1，Bo Song2，Li-Jun Wang1
1. Metallurgy and Materials Research Institute, General Research Institute for Nonferrous Metals2. School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing
摘 要：The electrochemical reduction mechanism of hafnium ion（Ⅳ） was studied in NaCl–KCl–K2HfCl6 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） process was diffusion-controlled. The diffusion coefficients were calculated at several temperatures, and the results obey the Arrhenius law. According to the relationship of lnD versus 1/T,the corresponding activation energy was determined to be 158.8 kJ ·mol-1. The square wave voltammetry results further confirm the reduction mechanism of hafnium.
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