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Electrochemical behavior of neptunium in NaCl-2CsCl melt

Hayashi, Hirokazu ; Minato, Kazuo*

The electrochemical behavior of neptunium in NaCl-2CsCl melt at 823-923 K was investigated by cyclic voltammetry, differential pulse voltammetry, and open-circuit chronopotentiometry after polarization. The results show that Np$$^{4+}$$ ions are reduced to Np metal by a two-step mechanism via Np$$^{3+}$$ ions in NaCl-2CsCl melt. The diffusion coefficients of Np$$^{3+}$$ and Np$$^{4+}$$ ions were determined from cyclic voltammograms. The apparent standard potentials of Np$$^{3+}$$/Np$$^{0}$$ and Np$$^{4+}$$/Np$$^{3+}$$ redox couples have been determined to be E$$^*$$(Np$$^{3+}$$/Np$$^0$$) = -3.353 + 7.67$$times$$10$$^{-4}$$T, and E$$^*$$(Np$$^{4+}$$/Np$$^{3+}$$) = -1.175 + 4.99$$times$$10$$^{-4}$$ T vs. Cl$$_2$$/Cl$$^-$$ (V), respectively. The activity coefficients of Np$$^{3+}$$ and Np$$^{4+}$$ ions were also determined using the reported data on the Gibbs free energy of formation for NpCl$$_3$$ and NpCl$$_4$$ in supercooled liquid state.

Language

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English

Journal

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Electrochemistry (Internet)

Volume

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92

Number

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4

Pages

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p.043020_1 - 043020_5

Publication Year/Month

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2024/04

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Patent information

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Paper URL

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https://doi.org/10.5796/electrochemistry.23-69159

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Keywords

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Np; Molten Salt; Electrochemistry; NaCl-2CsCl

Research Facility

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BECKY(バックエンド研究施設)  

Press Release

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Article of JAEA R&D Review

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Cooperating Institute

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東京電力; 日本原子力発電; 東北電力

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Category:Electrochemistry

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