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[en] This work presents a study on the electrochemical properties of PuCl3 in a molten LiCl-KCl eutectic, at a temperature range of 733-833 K. Transient electrochemical techniques, such as cyclic voltammetry and chrono-potentiometry, on inert metallic tungsten and molybdenum working electrodes have been used in order to investigate the reduction mechanism and transport parameters. The results show that Pu3+ is reduced to Pu metal by a single step mechanism and that the diffusion coefficient of Pu3+ ion is DPu3+ ∼2.10-5 cm2/s at 733 K. In addition the standard potential (-2796 V at 733 and vs. Cl2/Cl- reference electrode) and free enthalpy of formation for the Pu(III)/Pu(0) system have been measured and compared to thermodynamic data in order to estimate the activity coefficient of Pu3+ in the molten LiCl-KCl eutectic. (author)
Source
Organisation for Economic Co-Operation and Development - Nuclear Energy Agency, 75 - Paris (France); 1260 p; ISBN 92-64-02125-6; 
; 2003; p. 395-404; 7. information exchange meeting; Jeju (Korea, Republic of); 14-16 Oct 2002; 21 refs.
; 2003; p. 395-404; 7. information exchange meeting; Jeju (Korea, Republic of); 14-16 Oct 2002; 21 refs.