Membrane-free electrochemical extraction of lithium from geothermal water with transition metal ferrocyanide as a counter electrode

Junyan Zhang, Shuhao Wei, Chongbao Zhao, Sehria Zia, Can Liu, Tianlong Deng and Xiaoping Yu

Applied Energy, 2024, vol. 373, issue C, No S0306261924013394

Abstract: The eco-friendly extraction of lithium from liquid lithium minerals with low energy consumption is a research focus due to the expansion of new energy industries. Herein, a transition metal ferrocyanide electrode prepared by a novel in-situ polymerization asynchronous conversion method with K2NiFe(CN)6 as the active ingredient was developed for membrane-free electrochemical extraction of lithium. The structure and electrochemical properties of the electrode were studied in detail using various structural characterization and electrochemical testing techniques. Following structural regulation and hydrophilicity improvement, the insertion capacity of the electrode for only 100 mg·L−1 K+ reached 4.95 mg·cm−3 after 30 min, almost double that of the electrode prepared using the conventional coating method. The high selectivity of the electrode makes it an effective counter electrode for constructing an electrochemical system with a FePO4 electrode for membrane-free extraction of Li+ from geothermal water. The cumulative extraction rate of Li+ reached 70% after just five consecutive cycles, and the electrode performance did not change significantly after 50 cycles. The electrode developed in this work exhibited a high capacity and exceptional stability, making it an ideal candidate as a counter electrode for selective extraction of Li+ by environmentally friendly electrochemical technology.

Keywords: Lithium; Geothermal water; Counter-electrode; Ferrocyanide; Phenolic resin (search for similar items in EconPapers)
Date: 2024
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DOI: 10.1016/j.apenergy.2024.123956

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