电化学还原TiO_2反应机理及电极电势的研究  

Mechanism and Electro-potential of TiO_2 Electrochemical Reduction

作　　者：李颖君[1] 王淑兰[1] 钟和香[1] 孙华[1] 

机构地区：[1]东北大学理学院,沈阳110004

出　　处：《有色金属》2003年第4期68-70,共3页Nonferrous Metals

基　　金：国家自然科学基金(50274026)

摘　　要：采用循环伏安法和记时电流法研究800～860℃下TiO_2电极在CaCl_2熔盐中还原过程的反应机理及还原电极电势与温度的关系。TiO_2电极在CaCl_2熔盐中的循环伏安曲线、SEM和微区元素成分分析结果表明,可以通过电化学方法由TiO_2制取金属钛。对TiO_2电极在CaCl_2熔盐中的时间-电流曲线的计算表明,TiO_2的还原是逐级进行的,TiO_2先还原为TiO,TiO再还原为Ti。温度升高,两个还原步骤的还原电极电势都降低。Reaction mechanism of reduction TiO2 into Ti in molten CaCl2 salt, and the relationships of reduction potential with temperature are studied by Cyclic Voltammetry and Chronoamperometry in the range of 800℃-860℃ . The results of V- A curves, SEM and micro- area elemental analysis show that TiO2 can be reduced to Ti by molten salt electrolysis, and the reduction is conducted in two steps, firstly TiO2 is reduced to TiO, then TiO is reduced to Ti. The reduction potentials in both steps are decreased with the increase of the temperature.

关 键 词：冶金物理化学 钛 熔盐电解 TiO2 CACL2 电极电势 电化学还原 

分 类 号：TF823[冶金工程—有色金属冶金] TF01