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Electrode reaction of Pr on Sn electrode and its electrochemical recovery from LiCl‐KCl molten salt
Author(s) -
Han Wei,
Wang Wei,
Zhang Yongqiang,
Wang Yijie,
Li Mei,
Sun Yang
Publication year - 2021
Publication title -
international journal of energy research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.808
H-Index - 95
eISSN - 1099-114X
pISSN - 0363-907X
DOI - 10.1002/er.6394
Subject(s) - tafel equation , molten salt , electrochemistry , electrode , alloy , chemistry , metal , analytical chemistry (journal) , diffusion , working electrode , reference electrode , tin , materials science , inorganic chemistry , metallurgy , thermodynamics , chromatography , physics
Summary To recover Pr from molten chlorides, the electrode reactions of Pr 3+ on Sn‐coated W and liquid Sn electrodes were studied by a group of electrochemical techniques. CV and SWV results exhibited that the electrochemical signals pertaining to the formation of Pr‐Sn alloy compounds and solid solution appeared at less negative potentials than that of Pr 3+ on W electrode. The thermodynamic data of Pr‐Sn alloy compounds and the kinetic parameters for PrSn 3 /Pr 3+ pair were determined employing OCP, LP, and Tafel methods, separately. The measured diffusion coefficient ( D ) of Pr in liquid Sn metal was 9.40 × 10 −6 cm 2 s −1 . Furthermore, the electrochemical recovering Pr from molten salt was performed using liquid Sn as a working electrode, and the formed Pr‐Sn samples characterized by XRD and SEM‐EDS were composed of Sn and PrSn 3 phases.