Spectroelectrochemistry and Electrochemistry of Europium Ions in Alkali Chloride Melts

Author:

Uehara Akihiro1,Shirai Osamu2,Nagai Takayuki3,Fujii Toshiyuki1,Yamana Hajimu1

Affiliation:

1. Division of Nuclear Engineering Science, Research Reactor Institute, Kyoto University, Asashironishi, Kumatori-cho, Osaka, 590-0494, Japan

2. Divison of Applied Life Science, Graduate School of Agriculture, Kyoto University, Kitashirakawa Oiwake-cho, Sakyo-ku, Kyoto, 606-8502, Japan

3. Nuclear Fuel Cycle Engineering Laboratories, Japan Atomic Energy Agency, Muramatsu, Tokai-mura, Naka-gun, Ibaraki, 319-1194, Japan

Abstract

In order to investigate the redox equilibrium of europium ions in molten NaCl-2CsCl, UV-Vis absorption spectrophotometry measurements were performed for Eu2+ and Eu3+ in molten NaCl- 2CsCl at 923 K under simultaneous electrolytic control of their ratio. Molar absorptivities of EuCl3 and EuCl2 in NaCl-2CsCl at 923 K were determined to be (420±21) M −1cm−1 at 31200 cm−1 and (1130±56) M−1cm−1 at 30300 cm−1, respectively. The formal redox potential of the Eu2+/Eu3+ couple in NaCl-2CsCl melt at 923 K was determined to be (−0.941 ±0.004) V vs. Cl2/Cl by electromotive force measurements on varying concentration ratios of Eu2+ and Eu3+, which were performed using a technique based on the combination of electrolysis and spectrophotometry. Cyclic voltammetry was also carried out in order to examine the characteristics of the voltammograms for the Eu2+/Eu3+ couple in NaCl-2CsCl melt. The formal redox potential of the Eu2+/Eu3+ couple determined by a spectroelectrochemical method agreed with that determined by cyclic voltammetry [(−0.946±0.008) V vs. Cl2/Cl]. The effects of temperature on the redox potential of the Eu2+/Eu3+ couple in NaCl-2CsCl, NaCl-KCl, LiCl-KCl, and CsCl melts were studied by cyclic voltammetry in the range from 923 to 1123 K.

Publisher

Walter de Gruyter GmbH

Subject

Physical and Theoretical Chemistry,General Physics and Astronomy,Mathematical Physics

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