Electrochemical behavior of Th(IV) and its electrodeposition from ThF4-LiCl-KCl melt

Xianbin Wang,Wei Huang,Yu Gong,Feng Jiang,Haiyang Zheng,Tiejian Zhu,Dewu Long,Qingnuan Li

doi:10.1016/j.electacta.2016.02.184

Electrochemical behavior of Th(IV) and its electrodeposition from ThF4-LiCl-KCl melt

Xianbin Wang, Wei Huang + Show 6 more

https://doi.org/10.1016/j.electacta.2016.02.184

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Journal: Electrochimica Acta	Publication Date: Mar 3, 2016
Citations: 22

Affiliation: Key Laboratory of Nuclear Radiation and Nuclear Energy Technology, Chinese Academy of Sciences, University of Chinese Academy of Sciences, Shanghai Institute of Applied Physics

#Coupled Plasma Atomic Emission Spectrometer #Inductively Coupled Plasma Atomic Emission Spectrometer + Show 8 more

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Abstract

The electrochemical behavior of Th(IV) ion on molybdenum (Mo) electrode was studied by cyclic voltammetry (CV) and square wave voltammetry (SWV) technologies at 773 K in ThF4-LiCl-KCl melt. The reduction of Th(IV) to metal Th at −1.67V (vs. Ag/AgCl) is a four-electron exchange process, which is quasi-reversible and diffusion-controlled. The diffusion coefficient (D) and activation energy of diffusion process for Th(IV) were determined to be 3.77×10−5cm2s−1 and 59.2kJmol−1. The pulse potential electrolysis of ThF4-LiCl-KCl melt revealed that 86.8% of Th(IV) can be separated from the melt based on the inductively coupled plasma atomic emission spectrometer (ICP-AES) results.

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