Electrochemical evaluation of reference electrode for LiF-CaF2-LaF3 melt and electrochemical studies on Ni electrode

IF 4.9 2区化学 Q2 CHEMISTRY, PHYSICAL

Colloids and Surfaces A: Physicochemical and Engineering Aspects Pub Date : 2025-03-31 DOI:10.1016/j.colsurfa.2025.136782

Jing Pan , Yongde Yan , Yuan Deng , Xuepeng Wang , Li Ding , Yun Xue , Fuqiu Ma , Kai Zhu , Wei Liu

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引用次数: 0

Abstract

Reference electrode is considered to be very important in studies of the recovery of lanthanum (La) from fluorinated molten salt electrolysis. Undoubtedly, the search for economically stable reference electrodes is crucial. Herein, a Ni/NiF₂ reference electrode encapsulated in corundum material that can be used for electrochemical studies in LiF-CaF₂ melt is proposed. The performance of Ni/NiF₂ reference electrode in LiF-CaF₂ melt at 1113 K, such as stability and repeatability, is verified by the cyclic voltammetry (CV) method. Moreover, the electrochemical test results obtained with Ni/NiF₂ reference electrode and Pt quasi-reference electrode (QRE) were compared and analyzed. The diffusion coefficient of La(III) ions on the W electrode was calculated to be 7.72 × 10⁻⁵ cm² s⁻¹ using the Ni/NiF₂ reference electrode. Furthermore, the electrochemical behavior of La(III) on active Ni electrode was further investigated using a Ni/NiF₂ reference electrode, and La was successfully extracted on the Ni electrode. The results indicate that the Ni/NiF₂ reference electrode is extremely stable in LiF-CaF₂ melt, which opens a new possibility for reference electrode in fluoride salts.

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在从含氟熔盐电解中回收镧（La）的研究中，参比电极被认为是非常重要的。毫无疑问，寻找经济稳定的参比电极至关重要。本文提出了一种封装在刚玉材料中的 Ni/NiF2 参比电极，可用于 LiF-CaF2 熔体的电化学研究。通过循环伏安法（CV）验证了 Ni/NiF2 参比电极在 1113 K 的 LiF-CaF2 熔体中的性能，如稳定性和可重复性。此外，还对使用 Ni/NiF2 参比电极和铂准参比电极 (QRE) 所获得的电化学测试结果进行了比较和分析。使用 Ni/NiF2 参比电极计算出 La(III) 离子在 W 电极上的扩散系数为 7.72 × 10-5 cm2 s-1。此外，还使用 Ni/NiF2 参比电极进一步研究了活性 Ni 电极上 La(III) 的电化学行为，并在 Ni 电极上成功提取了 La。结果表明，Ni/NiF2 参比电极在 LiF-CaF2 熔体中非常稳定，这为氟化盐参比电极提供了新的可能性。

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来源期刊

Colloids and Surfaces A: Physicochemical and Engineering Aspects 化学-物理化学

CiteScore

8.70

自引率

9.60%

发文量

2421

审稿时长

56 days

期刊介绍： Colloids and Surfaces A: Physicochemical and Engineering Aspects is an international journal devoted to the science underlying applications of colloids and interfacial phenomena. The journal aims at publishing high quality research papers featuring new materials or new insights into the role of colloid and interface science in (for example) food, energy, minerals processing, pharmaceuticals or the environment.