Electrochemical behavior of plutonium fluoride species in LiF-CaF2 eutectic melt
| Autor: | Gilles Bourges, Mathieu Gibilaro, Pierre Chamelot, Julien Claquesin, Laurent Massot, Olivier Lemoine |
|---|---|
| Přispěvatelé: | Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Laboratoire de génie chimique [ancien site de Basso-Cambo] (LGC), Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées, Commissariat à l'Energie Atomique et aux énergies alternatives - CEA (FRANCE), Centre National de la Recherche Scientifique - CNRS (FRANCE), Institut National Polytechnique de Toulouse - INPT (FRANCE), Université Toulouse III - Paul Sabatier - UT3 (FRANCE), Laboratoire de Génie Chimique - LGC (Toulouse, France), Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE), Laboratoire de Génie Chimique (LGC), Université de Toulouse (UT)-Université de Toulouse (UT)-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université de Toulouse (UT) |
| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
Activity coefficient
Materials science Cyclic voltammetry General Chemical Engineering Diffusion Inorganic chemistry Chronopotentiometry 02 engineering and technology Activation energy 010402 general chemistry 01 natural sciences 7. Clean energy chemistry.chemical_compound symbols.namesake [CHIM.GENI]Chemical Sciences/Chemical engineering Electrochemistry Génie chimique [SPI.GPROC]Engineering Sciences [physics]/Chemical and Process Engineering Génie des procédés Eutectic system Arrhenius equation 021001 nanoscience & nanotechnology Plutonium 0104 chemical sciences chemistry Standard electrode potential symbols Molten fluoride 0210 nano-technology Fluoride |
| Zdroj: | Electrochimica Acta Electrochimica Acta, Elsevier, 2019, 301, pp.80-86. ⟨10.1016/j.electacta.2019.01.169⟩ Electrochimica Acta, 2019, 301, pp.80-86. ⟨10.1016/j.electacta.2019.01.169⟩ |
| ISSN: | 0013-4686 |
| DOI: | 10.1016/j.electacta.2019.01.169⟩ |
| Popis: | International audience; The electrochemical behavior of plutonium fluoride species was investigated in molten LiF-CaF2 medium in the 1093–1153 K temperature range with PuF4 additions. A preliminary thermodynamic study supposed a Pu(IV) carboreduction into Pu(III) and that Pu(III) reduction into metal proceeds in one step. Then, an electrochemical study was carried out on an inert electrode (tungsten) and confirmed the thermodynamic predictions: Pu(IV) is spontaneously reduced into Pu(III) in presence of carbon and Pu(III) is directly reduced into Pu(0): Pu(III) + 3e− = Pu(0). Moreover, Pu(III) reduction mechanism is a diffusion controlled process. Diffusion coefficients were calculated at different temperatures and obey to an Arrhenius' type law with an activation energy of 63 3 kJ mol−1. The standard potential of Pu(III)/Pu(0) was determined at 1113 K and is found to be −4.61 V vs. F2 (gaz)/F−. This value permitted to calculate activity coefficients for several molalities. |
| Databáze: | OpenAIRE |
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