Electrochemical behavior of uranyl in ionic liquid 1-butyl-3-methylimidazolium chloride mixture with water
- 336 Downloads
Electrochemical behaviors of U(VI) in 1-butyl-3-methylimidazolium chloride (C4MimCl) with various water contents investigated by chronopotentiometry and cyclic voltammetry. The electrochemical reduction of U(VI) was identified to follow two processes: a lower valence intermediate U(V) was initially formed at the potential of ca. −0.2 V(vs. Ag wire). Then, further deposition of UO2 was followed at around −0.8 V. Little amount of water (1–4 wt%) in C4MimCl, however, has an effect on the U(VI) reduction by changing the current density of the redox reaction and the diffusion coefficient of U(VI) in C4MimCl. The deposited product by potentiostatic electrolysis on the surface of stainless steel electrode was characterized by the scanning electron microscopy (SEM), energy dispersive X-ray (EDX) and X-ray diffraction (XRD) methods. Although the electrodeposited black film was amorphous, the electrochemical reduced product of U(VI) can be still confirmed to be UO2 by XRD after the crystallization of the amorphous deposits at 1,073 K in nitrogen atmosphere.
KeywordsIonic liquid Cyclic voltammetry Electrochemical behavior Uranyl
This work was supported by the Major Research Plan “Breeding and Trans-mutation of Nuclear Fuel in Advanced Nuclear Fission Energy System” of the Natural Science Foundation of China (Grants 91226201,11105162,11275219,11275090 and 91126006) and the “Strategic Priority Research program” of the Chinese Academy of Sciences (Grants XDA030104).
- 1.Johnson KE (2007) Interface Electrochim Soc 16(1):38–41Google Scholar
- 2.Seddon KR, Plechkova NV (2012) Ionic liquids uncoiled: critical expert overviews. Wiley, New YorkGoogle Scholar
- 3.Kirchner B, Clare B (2009) Ionic liquids, vol 290. Springer, Leipzig GermanyGoogle Scholar
- 11.Anderson CJ, Choppin G, Pruett D, Costa D, Smith W (1999) Radiochim Acta 84(1):31–36Google Scholar
- 14.Giridhar P, Venkatesan K, Subramaniam S, Srinivasan T, Vasudeva Rao P (2006) Radiochim Acta 94(8):415–420Google Scholar
- 16.Rao CJ, Venkatesan K, Nagarajan K, Srinivasan T (2008) Radiochim Acta 96(7):403–409Google Scholar
- 31.Bard AJ, Faulkner LR (1980) Electrochemical methods: fundamentals and applications, vol 2. Wiley, New YorkGoogle Scholar
- 33.Brown E, Sandifer J (1986) Physical methods in chemistry: electrochemical methods. Wiley, New YorkGoogle Scholar