Electrochemical Fluorination of Graphite Anode in KF-KBF<sub>4</sub> Molten Salt

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  • CHEN Gong
    School of Materials and Metallurgy, Northeastern University
  • SHI ZhongNing
    School of Materials and Metallurgy, Northeastern University Engineering Research Center for Process Technology of Nonferrous Metallurgy, Ministry of Education
  • LIU AiMin
    School of Materials and Metallurgy, Northeastern University
  • YU JiangYu
    School of Materials and Metallurgy, Northeastern University Engineering Research Center for Process Technology of Nonferrous Metallurgy, Ministry of Education
  • WANG ZhaoWen
    School of Materials and Metallurgy, Northeastern University Engineering Research Center for Process Technology of Nonferrous Metallurgy, Ministry of Education
  • GAO BingLiang
    School of Materials and Metallurgy, Northeastern University Engineering Research Center for Process Technology of Nonferrous Metallurgy, Ministry of Education
  • HU XianWei
    School of Materials and Metallurgy, Northeastern University Engineering Research Center for Process Technology of Nonferrous Metallurgy, Ministry of Education

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  • Electrochemical Fluorination of Graphite Anode in KF-KBF₄ Molten Salt

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Abstract

The electrochemical behavior of graphite anode in KF-KBF4 molten salt at 500°C was studied by means of cyclic voltammetry, electrochemical impedance spectroscopy and chronopotentiometry techniques in this present work. The results showed that I-type “CF” compound is formed at 1.5 V vs. Pt-QRE, and II-type “CF” compound is formed at 2.1 V, while fluorine gas is formed at 4.9 V. The electrochemical reaction at 1.5 V is quasi-reversible, while the electrochemical reaction at 2.1 V is irreversible. The resistance of II-type “CF” compound is higher than I-type “CF” compound, and the value of charge transfer coefficient (β) for electrochemical formation II-type “CF” compound is calculated to be 0.26.

Journal

  • Electrochemistry

    Electrochemistry 81 (7), 538-542, 2013

    The Electrochemical Society of Japan

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