标题: Liquid-metal-electrode-assisted electrolysis for the production of sodium and magnesium

作者: Guo, L (Guo, Lei); Yin, HY (Yin, Huayi); Li, WM (Li, Wenmiao); Wang, SY (Wang, Shiyu); Du, KF (Du, Kaifa); Shi, H (Shi, Hao); Wang, X (Wang, Xu); Wang, DH (Wang, Dihua)

来源出版物: JOURNAL OF MAGNESIUM AND ALLOYS  卷: 13  期: 4  页: 1579-1591  DOI: 10.1016/j.jma.2024.01.028  Published Date: 2025 APR  

摘要: Sodium (Na) and magnesium (Mg) are becoming important for making energy-storage batteries and structural materials. Herein, we develop a liquid-metal-electrode-assisted electrolysis route to producing Na and Mg with low-carbon emissions and no chlorine gas evolution. The clean production stems from the choice of a molten NaCl-Na2CO3 electrolyte to prevent chlorine gas evolution, an inert nickel-based anode to produce oxygen, and a liquid metal cathode to make the cathodic product sit at the bottom of the electrolytic cell. We achieve a current efficiency of >90% for the electrolytic production of liquid Na-Sn alloy. Later, Mg-Sn alloy is prepared using the obtained Na-Sn alloy to displace Mg from molten NaCl-MgCl2 with a displacement efficiency of >96%. Further, Na and Mg are separated from the electrolytic Na-Sn and displaced Mg-Sn alloys by vacuum distillation with a recovery rate of >92% and Sn can be reused. Using this electrolysis-displacement-distillation (EDD) approach, we prepare Mg from seawater. The CO2 emission of the EDD approach is similar to 20.6 kg CO2 per kg Mg, which is less than that of the Australian Magnesium (AM) electrolysis process (similar to 25.0 kg CO2 per kg Mg) and less than half that of the Pidgeon process (similar to 45.2 kg CO2 per kg Mg).

作者关键词: Molten-salt electrolysis; Inert anode; Liquid metal electrodes; Sodium; Magnesium.

KeyWords Plus: REDUCTION; CALCIUM; OXYGEN

地址: [Guo, Lei; Yin, Huayi; Li, Wenmiao; Wang, Shiyu; Du, Kaifa; Shi, Hao; Wang, Xu; Wang, Dihua] Wuhan Univ, Sch Resource & Environm Sci, Wuhan 430072, Peoples R China.

[Guo, Lei; Yin, Huayi; Li, Wenmiao; Du, Kaifa; Shi, Hao; Wang, Dihua] Wuhan Univ, Hubei Int Sci & Technol Cooperat Base Sustainable, Wuhan 430072, Peoples R China.

[Yin, Huayi; Wang, Dihua] Wuhan Univ & Chilwee, Joint Ctr Green Mfg Energy Storage Mat, Wuhan 430072, Peoples R China.

通讯作者地址: Yin, HY (通讯作者)，Wuhan Univ, Sch Resource & Environm Sci, Wuhan 430072, Peoples R China.

电子邮件地址: yinhuayi@whu.edu.cn

影响因子：13.8