open access publication

Article, 2023

Direct electrochemical dissolution of metallic uranium into deep eutectic solvent

JOURNAL OF NUCLEAR MATERIALS, ISSN 0022-3115, 0022-3115, Volume 575, 10.1016/j.jnucmat.2022.154229


Yang, Wonseok 0000-0001-9716-9459 [1] [2] Jung, Chanyong 0000-0002-8054-8927 [3] Cha, Han Lim [1] Park, Jun Woo 0000-0002-1446-8822 [1] Amphlett, James T. M. [1] [4] Liu, Shuang [2] Bae, Sang Eun 0000-0003-2668-8950 [3] Yun, Jong-Il 0000-0001-8629-2259 [1] Choi, Sungyeol (Corresponding author) [2]


  1. [1] Korea Adv Inst Sci & Technol, Dept Nucl & Quantum Engn, 291 Daehak Ro, Daejeon 34141, South Korea
  2. [NORA names: South Korea; Asia, East; OECD];
  3. [2] Seoul Natl Univ, Dept Nucl Engn, 1 Gwanak Ro, Seoul 08826, South Korea
  4. [NORA names: South Korea; Asia, East; OECD];
  5. [3] Korea Atom Energy Res Inst, 111 Daedeok Daero 989, Daejeon 34057, South Korea
  6. [NORA names: South Korea; Asia, East; OECD];
  7. [4] Seaborg Technol, Titangade 11, DK-2200 Copenhagen N, Denmark
  8. [NORA names: Other Companies; Private Research; Denmark; Europe, EU; Nordic; OECD]


Deep eutectic solvents (DESs) could make uranium recycling processes greener than using conventional solvents, owing to their inherent advantages such as being biodegradable and non-toxic. However, the chemistry of uranium ions in DES systems, particularly the mechanism of direct anodic dissolution of uranium metal, remains unclear. The anodic dissolution of uranium metal in choline chloride (ChCl)- ethylene glycol (EG) DES was conducted by applying a constant current. The oxidation state of uranium in ChCl-EG DES was uranium(IV) when compared to concentration and applied charge. Absorption spectra showed 8 coordinated U(IV) centered complexes formed in the ChCl-EG DES, regardless of the uranium source (i.e. uranium chloride or metallic uranium anodic dissolution). The in situ spectroelectrochemistry during potentiostatic electrolysis, cyclic voltammograms, and absorption spectra of different times of po-tentiostatic electrolysis showed U(IV) oxidized to U(V), and then the U(V) disproportionated into U(IV) and U(VI) species. Understanding fundamental uranium speciation in DES systems and electrochemical properties could facilitate the development of an eco-friendly nuclear fuel cycle and nuclear uranium recycling process using green DESs. (c) 2023 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY license ( )


Actinide, Choline chloride-ethylene glycol, Green chemistry, Nuclear fuel cycle, Spectroelectrochemistry, Waste management

Data Provider: Clarivate