Electrochemical behavior of uranium(IV) in ionic liquid-DMF mixtures

イオン液体-DMF混合溶媒中での4価ウランの電気化学的挙動

大内 和希  ; 小松 篤史 ; 鷹尾 康一朗*; 北辻 章浩  ; 渡邉 雅之   

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

ウランを用いるレドックスフロー電池(RFB)の開発に向けた電極反応研究として、イオン液体-DMF混合溶媒中でのUClの電気化学挙動を調査した。U(IV)の還元波とU(III)の酸化波は、-1.6Vと-1.5Vで観測されたが、U(IV)の酸化波は塩化物イオンの酸化より低い電位で観測できなかった。よって、イオン液体-DMF混合溶媒中でのU(III)/U(IV)対は、RFBのカソード反応として利用できる特性を持つ。

In this study, the electrochemical behavior of U(IV) in ionic liquid-DMF mixtures was investigated. DMF was added to the ionic liquid to reduce the viscosity to develop the redox flow battery (RFB) based on the reactions of U. The voltammogram of UCl was measured. Redox waves at -1.6 and -1.5 V were observed based on the reaction of U(III)/U(IV). Further oxidation current of U(IV) was not observed at more negative potential than Cl oxidation. We conclude that U(III)/U(IV) in ionic liquid-DMF mixture is applicable to the cathode reaction of RFB from these results.