Electrochemical Behavior and Reduction of UO22+ in LiCl-KCl Molten Salt

Author:

Wang Dong-Dong,Liu Ya-Lan,Zhong Yu-Ke,Jiang Shi-LinORCID,Liu Yi-Chuan,Chen Jia-Zhuang,Han Wei,Wang LinORCID,Shi Wei-QunORCID

Abstract

In this work, we explored the electrochemical behavior and reduction process of uranyl ions UO 2 2 + in molten LiCl-KCl eutectic at 773 K. Cyclic voltammetry (CV) and square wave voltammetry (SWV) results showed that the reduction of UO 2 2 + ions on the inert W electrode was a three-step process: (1) U O 2 2 + + e UO 2 + , (2) UO 2 + + e UO 2 and (3) UO 2 + 4 e U . Electrolysis experiments further confirmed this reduction mechanism that UO 2 2 + ions were reduced to UO2 on the molybdenum electrode by applying a constant potential of −1.00 V vs Ag/AgCl and subsequently to uranium metal at a more negative potential of −2.35 V vs Ag/AgCl. In addition, UO 2 2 + ions could be thoroughly reduced to uranium metal through a 4-h constant current electrolysis at −18 mA cm−2. Electronic absorption spectroscopy (EAS) and inductively coupled plasma optical emission spectroscopy (ICP-OES) respectively illustrated that the oxidation state of uranium was unchanged and uranium concentration gradually decreased during the electrolysis. Finally, X-ray diffraction (XRD) and scanning electron microscopy (SEM) were used to characterize the phase composition and microstructure of deposited products. Nano-sized UO2 and U metal particles were successfully obtained by constant potential and current electrolysis. The results of this work further reveal the electrochemical behavior and reduction mechanism of UO 2 2 + ions in molten LiCl-KCl, providing a guiding ideology for the pyrochemical reprocessing of oxide spent fuels.

Funder

National Science Fund for Distinguished Young Scholars

National Natural Science Foundation of China

Publisher

The Electrochemical Society

Subject

Materials Chemistry,Electrochemistry,Surfaces, Coatings and Films,Condensed Matter Physics,Renewable Energy, Sustainability and the Environment,Electronic, Optical and Magnetic Materials

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