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Electrochemical investigation of the anode processes in LiF–NdF 3 melt with low oxygen content
International Journal of Minerals, Metallurgy and Materials ( IF 4.8 ) Pub Date : 2021-01-08 , DOI: 10.1007/s12613-020-2010-7
Chen-ming Fan , Shi-zhe Liu , Jing-jiu Gu , Shi-you Guan , Jin-hua Zhao , Bing Li

The oxidation of oxygen ions and the generation of an anode effect at a low oxygen content of 150 mg/kg were discussed in this paper. Cyclic voltammetry and square-wave voltammetry tests were conducted to explore the anodic processes of LiF–NdF3 melt after a lengthy period of pre-electrolysis purification at 1000°C (during which the oxygen content reduced from 413 to 150 mg/kg). The oxidation process of oxygen ions was found to have two stages: oxidation product adsorption and CO/CO2 gas evolution. The adsorption stage was controlled by diffusion, whereas the gas evolution was controlled by the electrochemical reaction. In comparison with oxygen content of 413 mg/kg, the decrease in the amplitude of the current at low oxygen content of 150 mg/kg was much gentler during the forward scanning process when the anode effect occurred. Fluorine-ion oxidation peaks that occurred at about 4.2 V vs. Li/Li+ could be clearly observed in the reverse scanning processes, in which fluorine ions were oxidized and perfluorocarbons were produced, which resulted in an anode effect.



中文翻译:

低氧含量的LiF–NdF 3熔体中阳极过程的电化学研究

本文讨论了在150 mg / kg的低氧含量下氧离子的氧化和阳极效应的产生。进行了循环伏安法和方波伏安法测试,以探究LiF–NdF 3熔体在1000°C下长时间电解纯化后的阳极过程(在此过程中,氧含量从413降至150 mg / kg)。发现氧离子的氧化过程具有两个阶段:氧化产物吸附和CO / CO 2气体逸出。吸附阶段由扩散控制,而气体逸出则由电化学反应控制。与413 mg / kg的氧含量相比,在发生阳极效应时,在正向扫描过程中,低氧含量为150 mg / kg时电流幅度的减小要缓和得多。在反向扫描过程中可以清楚地观察到在约4.2 V vs. Li / Li +处出现的氟离子氧化峰,该过程中氟离子被氧化并生成了全氟化碳,从而产生了阳极效应。

更新日期:2021-01-08
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