Cathodic process in NaCl-KCl-Al2S3 molten salts

IF 4.1 3区化学 Q1 CHEMISTRY, ANALYTICAL

Journal of Electroanalytical Chemistry Pub Date : 2025-07-12 DOI:10.1016/j.jelechem.2025.119333

Hongguang Kang, Xianwei Hu, Ruidong Guo, Liang Tian, Qiheng Wang, Hanyang Zhang, Aimin Liu, Zhongning Shi, Zhaowen Wang

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Abstract

The electrolysis of Al₂S₃ in NaCl-KCl molten salts is one of effective ways to achieve sustainable and low-carbon aluminum preparation. The dissolution of Al₂S₃ into a chloride molten salt promotes the generation of Al-S-Cl complex ions. In this study, the discharge complex ions present in the equimolar NaCl-KCl salt with 1 wt% Al₂S₃ were analyzed via quantum chemistry calculations at 953 K. On this basis, the cathodic electrochemical behaviors were experimentally investigated via linear sweep voltammetry and chronoamperometry. The results show that Al₂S₃Cl⁻ complex ions are discharged on the graphite cathode through a one-step, three-electron transfer reduction process. This reduction is diffusion-controlled and exhibits a quasi-reversible process, with a charge transfer coefficient of 0.271 and a diffusion coefficient of 7.500 × 10⁻⁵ cm²·s⁻¹.

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NaCl-KCl-Al2S3熔盐的阴极过程

在NaCl-KCl熔盐中电解Al2S3是实现可持续低碳制铝的有效途径之一。Al2S3溶解到氯化物熔盐中促进了Al-S-Cl络合离子的生成。在953 K下，用量子化学方法分析了等摩尔NaCl-KCl盐中含有1wt % Al2S3的放电络合离子。在此基础上，通过线性扫描伏安法和时间电流法对其阴极电化学行为进行了实验研究。结果表明：Al2S3Cl−络合离子通过一步三电子转移还原过程在石墨阴极上放电；该还原过程受扩散控制，呈现准可逆过程，电荷转移系数为0.271，扩散系数为7.500 × 10−5 cm2·s−1。

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来源期刊

Journal of Electroanalytical Chemistry 化学-电化学

CiteScore

7.80

自引率

6.70%

发文量

912

审稿时长

2.4 months

期刊介绍： The Journal of Electroanalytical Chemistry is the foremost international journal devoted to the interdisciplinary subject of electrochemistry in all its aspects, theoretical as well as applied. Electrochemistry is a wide ranging area that is in a state of continuous evolution. Rather than compiling a long list of topics covered by the Journal, the editors would like to draw particular attention to the key issues of novelty, topicality and quality. Papers should present new and interesting electrochemical science in a way that is accessible to the reader. The presentation and discussion should be at a level that is consistent with the international status of the Journal. Reports describing the application of well-established techniques to problems that are essentially technical will not be accepted. Similarly, papers that report observations but fail to provide adequate interpretation will be rejected by the Editors. Papers dealing with technical electrochemistry should be submitted to other specialist journals unless the authors can show that their work provides substantially new insights into electrochemical processes.