Two-Phase Rare-Earth Alloys as Reference Electrodes in Molten Chlorides for Reliable Electrochemical Measurements
Two-Phase Rare-Earth Alloys as Reference Electrodes in Molten Chlorides for Reliable Electrochemical Measurements
复制标题
DOI：
10.1007/978-3-030-92662-5_31
复制
发表时间：
2022
期刊：
影响因子：
--
通讯作者：
N. Smith;Stephanie Castro Baldivieso;T. Lichtenstein;Sang-Moo Im;Hojong Kim
中科院分区：
文献类型：
--
作者：
N. Smith;Stephanie Castro Baldivieso;T. Lichtenstein;Sang-Moo Im;Hojong Kim
在400 ~ 800℃的温度范围内，用电动势测量方法检测了纯稀土参考电极（Nd, Gd）在熔融氯盐（LiCl-KCl-RECl3）中的歧化反应（即Nd + NdCl3→NdCl2）和活性金属溶解对其寿命和稳定性的影响。研究了几种制备和校准稳定的Gd- bi两相电极的方法，包括使用连续浸入电解液的纯Gd金属参比电极，间歇浸入电解液的纯Gd金属参比电极以及将纯Gd沉积在惰性W丝上的瞬态技术。电动势测量也被用来检验两相合金作为参比电极的寿命，并与纯稀土金属作为参比电极进行比较。纯稀土金属的稳定性不超过15小时，而两相Gd-Bi电极的稳定性超过24天（室温500-700°C）。
Electromotive force measurements were used to examine pure rare-earth reference electrodes (Nd, Gd) inmolten chloride salts (LiCl-KCl-RECl3) over a temperature range ofT= 400–800 °C to determine the effects of disproportionation reactions (i.e., Nd + NdCl3→ NdCl2) and active metal dissolution on their longevity and stability. Several methods for developing and calibrating a stable two-phase Gd-Bi electrode were investigated including the use of a pure Gd metal reference electrode continuously submerged in the electrolyte, a pure Gd metal reference electrode intermittently dipped into the electrolyte, and a transient technique that deposited pure Gd onto an inert W wire. Electromotive force measurements were also employed to examine the lifetime of the two-phase alloy as the reference electrode in comparison to a pure rare-earth metal as the reference electrode. Pure rare-earth metal did not exhibit stability for more than 15 h, whereas two-phase Gd-Bi electrodes were found to be stable for over 24 days atT= 500–700 °C.