中国有色金属学报(英文版)
Transactions of Nonferrous Metals Society of China
| Vol. 32 No. 8 August 2022 |
（1. Henan Province Industrial Technology Research Institute of Resources and Materials, Zhengzhou University, Zhengzhou 450001, China;
2. National Engineering Laboratory of Vacuum Metallurgy, Kunming University of Science and Technology, Kunming 650093, China）
Abstract:X-ray photoelectron spectroscopy (XPS) and Raman spectroscopy were used to analyze the complexes in LiCl-KCl eutectic salt containing VCl3 and KF. The additional fluoride ions would replace chloride ions and combine with V(III) to form VF63-. The electrochemical behavior of V(III) was evaluated under condition of the molar concentration ratio of F- to Vn+ (α) equal to 0:1, 1:1, 2:1, 5:1, 20:1 and 50:1, respectively. The results showed that a new reduction step appeared: VF63-→V2+, and the reduction mechanism of vanadium ions became more complicated. The metallic vanadium was deposited on the tungsten electrode at -2.90 V in the LiCl-KCl melts for 6 h, and the products were characterized by SEM-EDS. It was indicated that the particle size of the product decreased with adding fluoride ions for the forming of the coordination compound VF63-.
Key words: V(III) ion; molten salt; electrochemical behavior; reduction mechanism; complex
