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<p>During the magnesium electrolysis process, graphite anodes are prone to consumption and fragmentation, disrupting normal operations and releasing greenhouse gases. In this study, we introduce a continuous, carbon-free approach to magnesium electrolysis using a stable argon plasma as the anode. The argon plasma anode operates via two distinct electrochemical stages: argon ionization at an average potential of 347.3 ± 95.3 V and chlorine evolution at 124.5 ± 9.0 V. A protective boron nitride (BN) coating on the tungsten collector filament significantly reduces corrosion. Atomic emission spectroscopy confirms the presence of Ar<sup>+</sup> ions, whose concentration increases with current. Thermodynamic calculations and reaction analysis demonstrate that Ar<sup>+</sup> facilitates chloride oxidation via the reaction: 2Ar<sup>+</sup> + 2Cl<sup>-</sup> → 2Ar + Cl<sub>2</sub>. This research demonstrates the feasibility of argon plasma as an inert anode for chloride-based molten salt electrolysis, offering a sustainable alternative for magnesium production and potential applications in other high-temperature corrosive environments.</p><p></p>

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Towards green magnesium preparation using a recyclable argon plasma anode for continuous electrolysis in molten chlorides

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2026年3月3日

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  • Sen Feng,
  • Xiaoying Jiang,
  • Chengyuan Ni,
  • Mouhamadou Aziz Diop,
  • Fengguo Liu,
  • Jun Liu,
  • Chengdong Xia,
  • Junjie Zhang,
  • Aimin Liu,
  • Zhongning Shi

摘要

During the magnesium electrolysis process, graphite anodes are prone to consumption and fragmentation, disrupting normal operations and releasing greenhouse gases. In this study, we introduce a continuous, carbon-free approach to magnesium electrolysis using a stable argon plasma as the anode. The argon plasma anode operates via two distinct electrochemical stages: argon ionization at an average potential of 347.3 ± 95.3 V and chlorine evolution at 124.5 ± 9.0 V. A protective boron nitride (BN) coating on the tungsten collector filament significantly reduces corrosion. Atomic emission spectroscopy confirms the presence of Ar+ ions, whose concentration increases with current. Thermodynamic calculations and reaction analysis demonstrate that Ar+ facilitates chloride oxidation via the reaction: 2Ar+ + 2Cl- → 2Ar + Cl2. This research demonstrates the feasibility of argon plasma as an inert anode for chloride-based molten salt electrolysis, offering a sustainable alternative for magnesium production and potential applications in other high-temperature corrosive environments.