Electroreduction of Gd3+ on W and Zn Electrodes in LiCl-KCl Eutectic: A Comparison Study
Electroreduction of Gd3+ on W and Zn Electrodes in LiCl-KCl Eutectic: A Comparison Study
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LiCl-KCl共晶中W和Zn电极上Gd3电还原的比较研究
DOI：
10.1149/2.0541510jes
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发表时间：
2015
影响因子：
3.9
通讯作者：
Shi, Wei-Qun
中科院分区：
文献类型：
--
作者：
Wang, Lu;Feng, Yi-Xiao;Chai, Zhi-Fang;Shi, Wei-Qun
本文研究了Gd ~（3+）在LiCl-KCl共晶体系中在W和Zn电极上的电化学性质。结果表明，钨阴极上Gd ~（3+）的还原是以单步模式进行的。用循环伏安法研究了Gd ~（3+）/Gd氧化还原反应的动力学性质。研究了773 K时Gd ~（3+）在LiCl-KCl-GdCl_3熔体中的液态锌电极和在LiCl-KCl-GdCl_3-ZnCl_2共晶中的薄膜锌电极上的还原行为。计算了Gd ~（3+）在LiCl-KCl-GdCl_3熔体中在液态锌电极上的扩散系数为5.44 × 10 ~（-5）cm ~（2）s ~（-1）。用Nicholson方法计算了773 K时Gd ~（3+）在液态锌电极和钨电极上的电荷转移标准速率常数约为1 × 10 ~（-2）cm ~（-1），根据Matsuda-Ayabe电化学可逆性的实用概念判据，表明Gd ~（3+）到Gd的氧化还原反应是准可逆的。在薄膜锌电极和液体锌电极上进行了Gd 3+的电沉积。X射线衍射（XRD）结果表明，在薄膜锌电极上生成了金属间化合物GdZn 12、Gd 2 Zn 17、Gd 13 Zn 58和GdZn，而在液态锌电极上生成了金属间化合物GdZn 12。所有的金属间化合物的形态特征，其特征在于通过扫描电子显微镜（SEM）结合能量色散谱（EDS）。(c)2015年电化学学会。All rights reserved.
This work presents a comparative study of electrochemical properties of Gd3+ on W and Zn electrodes in LiCl-KCl eutectic. It was found that Gd3+ reduction on a tungsten cathode occurs in a single step pattern. Relevant kinetic properties of the Gd3+/Gd redox reaction were investigated by cyclic voltammetry (CV). The reduction of Gd3+ at a liquid zinc electrode in LiCl-KCl-GdCl3 melt and a film zinc electrode in LiCl-KCl-GdCl3-ZnCl2 eutectic were also studied at 773 K. The diffusion coefficient of Gd3+ at the liquid zinc electrode was calculated to be 5.44 x10(-5) cm(2)s(-1) in LiCl-KCl-GdCl3 melt. The standard rate constants for the charge transfer of Gd3+ at the liquid zinc electrode or on the tungsten electrode was calculated to be about 1 x10(-2) cms(-1) at 773 K by Nicholson method, revealing the redox reaction of Gd3+ to Gd is quasi-reversible based on the Matsuda-Ayabe criteria for practical concept of electrochemical reversibility. Electrodeposition of Gd3+ was carried out on both the film zinc electrode and the liquid zinc electrode. X-ray diffraction (XRD) results showed that intermetallic compounds GdZn12, Gd2Zn17, Gd13Zn58 and GdZn were obtained on the film zinc electrode, whilst intermetallic compound GdZn12 was gained at the liquid zinc electrode. The morphological properties of all the intermetallic compounds were characterized by scanning electron microscopy (SEM) coupled with energy dispersive spectrometry (EDS). (c) 2015 The Electrochemical Society. All rights reserved.
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