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Electrochemical measurement and analysis of YCl3, ScCl3, GdCl3 and MgCl2 in molten eutectic LiCl-KCl
Journal of Electroanalytical Chemistry ( IF 4.5 ) Pub Date : 2021-09-09 , DOI: 10.1016/j.jelechem.2021.115689
Michael R. Shaltry 1 , Prabhat K. Tripathy 1 , Tae-Sic Yoo 1 , Guy L. Fredrickson 1
Affiliation  

Electrochemical measurements of YCl3, ScCl3, GdCl3 and MgCl2 were obtained in molten LiCl-KCl eutectic at 773 K using a three-electrode configuration. Tungsten rods were used as the working and counter electrodes. Two quasi- and one reference electrode(s) (glassy carbon, nickel wire, and Ni/NiO) were used to collect electrochemical measurements of the analyte salts. Cyclic voltammetry data were analyzed to calculate values of diffusion coefficient, exchange current density, and charge transfer resistance and were determined to be on the order of 10−5 cm2 s−1, 10−2 A cm−2, and 100 Ω; respectively. In general, the values of diffusion coefficients were found to be consistent with those reported of high-temperature molten salts. Relatively large values of exchange current density corresponded with smaller values of charge transfer resistance. These values were found to be reasonable in comparison to results available in the literature. The measured cyclic voltammograms were normalized with respect to both lithium reduction and chloride ion oxidation potentials. Such a normalization technique is effective for comparing experimentally obtained cyclic voltammetry data to those that have been published. An analysis of experimentally obtained results indicates the relation of electrode reactions (e.g., differences of reduction potentials) are independent of the choice of reference electrode. Additionally, the choice of reference electrode did not affect the electrochemical window, exchange current density, or diffusion coefficient values.



中文翻译:

熔融共晶LiCl-KCl中YCl3、ScCl3、GdCl3和MgCl2的电化学测量与分析

YCl 3、ScCl 3、GdCl 3和MgCl 2 的电化学测量是在773 K 的熔融LiCl-KCl 共晶中使用三电极配置获得的。钨棒用作工作电极和反电极。两个准电极和一个参比电极(玻璃碳、镍线和 Ni/NiO)用于收集分析物盐的电化学测量值。分析循环伏安数据以计算扩散系数、交换电流密度和电荷转移电阻的值,并确定为10 -5  cm 2  s -1、10 -2  A cm -2和10 0 的数量级 Ω; 分别。通常,发现扩散系数的值与高温熔盐报道的值一致。相对较大的交换电流密度值对应于较小的电荷转移电阻值。与文献中可获得的结果相比,发现这些值是合理的。测量的循环伏安图相对于锂还原电位和氯离子氧化电位进行归一化。这种归一化技术对于将实验获得的循环伏安数据与已发表的数据进行比较是有效的。对实验获得的结果的分析表明电极反应的关系(例如,还原电位的差异)与参考电极的选择无关。此外,

更新日期:2021-09-15
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