FFC工艺中阴极TiO2的导电性及影响因素分析
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conductivity of a TiO2 cathode in the FFC process and analysis of its influencing factors
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    摘要:

    针对FFC工艺,通过TiO2烧结及电解实验,研究TiO2电极导电性。采用X射线衍射仪(XRD)对烧结前后的产物和电解产物进行分析。结果表明,高温烧结可以改变TiO2的能带结构,产生导电空位;TiO2电极在熔盐中形成双电层,使氧原子离子化,形成TiO2x离子结构;熔盐中的离子渗透到TiO2电极内部,增加了电极内的导电离子数。TiO2电极的活化可通过高温烧结产生的导电空位、双电层形成的离子结构及渗透到电极内部的熔盐离子来实现,使FFC工艺中的电解得以顺利进行。

    Abstract:

    The conductivity of a TiO2 cathode in the FFC process was studied by sintering and electrolyzing experiments. Sintered TiO2 cathode and electrochemical reduction of TiO2 were measured using Xray diffraction. Results show that changing the energy band structure of TiO2 via hightemperature sintering can cause electric conduction vacancy. An electric double layer can be formed in molten salt. Ionization of oxygen atoms leads to formation of TiO2x ionic structures. The ions infiltrate to the electrode in molten salt, increasing the number of conduction ions. The electrolyzing process proceeds smoothly, based on the integrated mechanism of activating the TiO2 cathode. The activated TiO2 cathode can be obtained by forming electric conduction vacancy at hightemperature sintering, the TiO2x ionic structure by electric double layer, and ions infiltrating to the interior of the electrode.

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李泽全,白晨光,陈小亮,陶长元. FFC工艺中阴极TiO2的导电性及影响因素分析[J].重庆大学学报,2008,31(11):1323-1326.

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