Electrochemical behavior of cerium ion in molten LiCI-KCI |
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Authors: | Changshui WANG Yi LIU Hu HI Fanxing GAO Lisheng LIU Shangwen CHANG Jianhua GUO Li CHANG Yinggen OUYANG |
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Affiliation: | Department of Radiochemistry, China Institute of Atomic Energy, Beijing 102413, China |
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Abstract: | The electrode process of cerium(III) on the Mo electrode in eutectic LiCl-KCl melt was investigated by electrochemical transient techniques in the temperature range of 673–783 K, respectively. These results unanimously indicated that the reduction process of cerium(III) to cerium metal was a single step exchanging three electrons which was controlled by diffusion of cerium(III). Diffusion coefficients (DCe(III)) in eutectic LiCl-KCl melt were determined by cyclic voltammetry, chronopotentiometry and square wave voltammetry. An empirical diffusion coefficient function depending on temperature was proposed: lnDCe(III)=?2.129?5704/T. The formal potentials (Eθ′Ce(III)/Ce(0) versus Ag/AgCl reference electrode) at different temperatures were obtained from chronopotentiometry, which were –2.10 V (673 K) and –2.07 V (733 K), respectively. |
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Keywords: | diffusion coefficient eletctrochemical reduction molten chlorides rare earths formal potential |
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