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采用循环伏安法和计时电流法研究了CeF_3-LiF-MF_2-CeO_2(M=Ba,Ca)体系石墨阳极上的电极过程。实验结果表明,铈电解的阳极过程与体系中阴离子放电过程密切相关,基本不受体系中阳离子的影响,各阳极反应高度不可逆。随阳极电位的增大,依次生成碳氧化合物、COF_2和CF_4。循环伏安法正向扫描的峰电流随体系中氧化物含量、温度的升高而增大,电位扫描速率的影响不显著。CeF_3-LiF-BaF_2-CeO_2体系发生阳极效应时的起始电位为4.6V(相对于Li~+/Li),CeF_3-LiF-MF_2-CeO_2(M=Ba,Ca)体系正常电解时的阳极产物主要为CO_2。
The electrode process on the graphite anode of CeF_3-LiF-MF_2-CeO_2 (M = Ba, Ca) system was studied by cyclic voltammetry and chronoamperometry. The experimental results show that the anodic process of cerium electrolysis is closely related to the anion discharge process in the system, and is basically not affected by the cations in the system. The anodic reactions are highly irreversible. With the anode potential increases, followed by the formation of carbon oxides, COF_2 and CF_4. The peak current of positive scan by cyclic voltammetry increased with the increase of oxide content and temperature in the system, but the effect of potential scan rate was not significant. The anode potential of the CeF_3-LiF-BaF_2-CeO_2 system during normal electrolysis was 4.6V (vs. Li ~ + / Li) and CeF_3-LiF-MF_2-CeO_2 (M = Ba, Ca) Mainly CO_2.