ORAL

SESSION: MoltenMonAM-R3	Gaune-Escard International Symposium on Sustainable Molten Salt and Ionic Liquid Processing (5th Intl. Symp. on Sustainable Molten Salt and Ionic Liquid Processing)
Mon Oct, 23 2017	Room: Peninsula 1
Session Chairs: Tamas Oncsik; Session Monitor: TBA

15:00: [MoltenMonAM06]
Electrochemical Behaviors of Uranium and Lanthanide Cations in LiCl-KCl Melt Investigated by Electrochemical and Spectroscopic Methods
Sang-eun Bae¹ ; Suhee Choi¹ ; Tae-hong Park¹ ; Jong-yun Kim¹ ; Young Hwan Cho¹ ; Jei-won Yeon¹ ; ¹Korea Atomic Energy Research Institute, Daejeon, Korea (Republic of [South] Korea);
Paper Id: 164 [Abstract]

Pyrochemical process has been considered as one of the options for a recycling technique of spent nuclear fuels. In the pyrochemical process, there exist a number of chemical elements, especially nuclear materials such as uranium, plutonium, and various fission products. In order to successfully accomplish the research for the pyrochemical process, accurate information on the chemical and electrochemical reactions of the elements in the molten salt should be acquired. A number of works have been performed to investigate the chemical and electrochemical properties of actinide and lanthanide ions in LiCl-KCl melt. It is well-known that spectroscopic tools such as UV-VIS absorption and laser induced luminescence spectroscopies as well as electrochemical tools such as cyclic voltammetry (CV) and rotating disk electrode (RDE) methods can give useful information for the chemical and electrochemical behaviors of the actinide and lanthanide ions in the solution. In this work, the spectroscopic and electrochemical methods were employed to investigate the behaviors of the elements in the LiCl-KCl melt. The oxidation state shift of the elements during electrochemical reactions of the uranium and lanthanide cations in LiCl-KCl melt was monitored by using the spectroscopic methods. Many useful electrochemical properties for the elements were collected in LiCl-KCl melt by using electrochemical methods such as CV and RDE. In particular, the RDE measurement could produce very useful parameters such as diffusion coefficients, Tafel slope, exchange current density, electron transfer coefficient, etc. In this presentation, we will show the research progress for the spectroscopic and electrochemical measurements of the actinide and lanthanide cations in the LiCl-KCl molten salt.