采用融盐电解法,在900℃熔盐CaCl_2中以烧结TiO_2为阴极,石墨棒为阳极制备金属钛.研究O~(2-)在TiO_2电极中的形成及其迁移过程.结果表明:实验高温促使TiO_2结构中氧空位的形成及O~(2-)产生;O~(2-)通过氧空位从阴极内部迁移到表面,钛酸钙是电解过程的必然中间产物,阴极表面生成的致密金属层钛阻碍O~(2-)从阴极内部往表面的迁移.
The method of electro-deoxidation was used to reduce solid TiO_2 to titanium in CaCl_2 molten salt at 900 ℃ The sintered TiO_2 samples acted as the cathode and graphite as the anode. The formation and transportation process of O~(2-) in the electrolytic system with molten salts were studied. Results show that the experiment high-temperature promotes the formation of oxygen vacancies in TiO_2 structure and occurrence of O~(2-); O~(2-) transfer from the cathode inside to outside through the oxygen vacancies; the calcium titanate is necessary intermediate product in the electrolysis process; the dense layer of metal titanium on the cathode surface hinders O~(2-) from transformation.
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