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Securing reversibility of U$$^{V}$$O$$_{2}$$$$^{+}$$/U$$^{VI}$$O$$_{2}$$$$^{2+}$$redox equilibrium in [emim]Tf$$_{2}$$N-based liquid electrolytes towards uranium redox-flow battery

Takao, Koichiro*; Ouchi, Kazuki  ; Komatsu, Atsushi ; Kitatsuji, Yoshihiro  ; Watanabe, Masayuki   

Electrochemical behavior of U$$^{rm V}$$O$$_{2}$$$$^{+}$$/U$$^{rm VI}$$O$$_{2}$$$$^{2+}$$ in 1-ethyl-3-methylimidazolium bis(trifluoromethyl)sulfonylamide ([emim]Tf$$_{2}$$N) ionic liquid was studied to clarify what are required to attain its redox reversibility for utilizing depleted U as an electrode active material in a redox flow battery. As a result, reversibility of the U$$^{rm V}$$O$$_{2}$$$$^{+}$$/U$$^{rm VI}$$O$$_{2}$$$$^{2+}$$ redox reaction was successfully achieved in use of a glassy carbon working electrode under presence of Cl$$^{-}$$ in [emim]Tf$$_{2}$$N. To improve diffusivity of solutes, [emim]Tf$$_{2}$$N diluted with an auxiliary molecular solvent, N,N-dimethylformamide (DMF). We have succeeded in demonstrating a reversible redox reaction of [U$$^{rm VI}$$O$$_{2}$$Cl$$^{4}$$]$$^{2-}$$ + e$$^{-}$$ = [U$$^{rm V}$$O$$_{2}$$Cl$$^{4}$$]$$^{3-}$$ in the 50:50 v/v [emim]Tf$$_{2}$$N-DMF liquid electrolyte containing Cl$$^{-}$$.

Language

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English

Journal

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European Journal of Inorganic Chemistry

Volume

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27

Number

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14

Pages

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p.e202300787_1 - e202300787_7

Publication Year/Month

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2024/05

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Paper URL

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https://doi.org/10.1002/ejic.202300787

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Link to research data related to this paper/report.

Keywords

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ウラニル錯体; イオン液体; レドックスフロー電池; 再資源化

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Press Release

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Article of JAEA R&D Review

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Cooperating Institute

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東京工業大学

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- Accesses

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Category:Chemistry, Inorganic & Nuclear

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