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Electrochemical behavior of La(III) on the zinc-coated W electrode in LiCl-KCl eutectic
Liu YL(刘雅兰); Liu K(刘奎); Yuan LY(袁立永); Chai ZF(柴之芳); Shi WQ(石伟群); Liu, YL; Ye, GA; Liu, K; Yuan, LY; Chai, ZF; Shi, WQ
Corresponding Author石伟群
AbstractThe electrochemical behaviors of La(III) on W and Zn-coated W electrodes was investigated, respectively, in the LiCl-KCl eutectic by cyclic voltammetry (CV) and open circuit chronopotentiometry (OCP). On an inert W electrode, the reduction of La(III) takes place at about -2.11 V in a single soluble-insoluble electrochemical step La(III)/La(0). In contrast, the electrochemical reduction of La(III) on a Zn-coated W electrode was observed at less cathodic potentials than at the inert W electrode. The potential shift was mainly caused by the formation of La-Zn intermetallic compounds, in which the activity of La was largely decreased compared to that in pure La metal. From CV results, six peaks corresponding to the formation of La-Zn intermetallic compounds were observed. By the OCP technique, eight plateaus corresponding to the co-existence of two phases of La-Zn intermetallic compound such as LaZn-LaZn2, LaZn2-LaZn4, LaZn4-LaZn5, LaZn5-La3Zn22, La3Zn22-La2Zn17, La2Zn17-LaZn11, LaZn11-LaZn13 and LaZn13-Zn were observed. The formation energy of each La-Zn intermetallic compound, and the overall formation constant were estimated from OCP measurements at 723 K. X-ray diffraction (XRD) and scanning electron microscopy (SEM) coupled with energy dispersive X-ray spectroscopy (EDS) were employed to characterize the potentiostatic and galvanostatic electrolysis products. The presences of LaZn, LaZn2, LaZn5 and La2Zn17 in the electrolysis products were identified. (C) 2015 Elsevier Ltd. All rights reserved.
KeywordLa(III) electrochemical behavior LiCl-KCl eutectic zinc-coated W electrode
Subject AreaElectrochemistry
Indexed BySCI ; EI
WOS Research AreaElectrochemistry
WOS SubjectElectrochemistry
WOS IDWOS:000354055500027
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Document Type期刊论文
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GB/T 7714
Liu YL,Liu K,Yuan LY,et al. Electrochemical behavior of La(III) on the zinc-coated W electrode in LiCl-KCl eutectic[J]. ELECTROCHIMICA ACTA,2015,168:206-215.
APA 刘雅兰.,刘奎.,袁立永.,柴之芳.,石伟群.,...&Shi, WQ.(2015).Electrochemical behavior of La(III) on the zinc-coated W electrode in LiCl-KCl eutectic.ELECTROCHIMICA ACTA,168,206-215.
MLA 刘雅兰,et al."Electrochemical behavior of La(III) on the zinc-coated W electrode in LiCl-KCl eutectic".ELECTROCHIMICA ACTA 168(2015):206-215.
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