Direct electrochemical reduction of titanium dioxide in Lewis basic AlCl3–1-butyl-3-methylimidizolium ionic liquid
Direct electrochemical reduction of titanium dioxide in Lewis basic AlCl3–1-butyl-3-methylimidizolium ionic liquid
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DOI：
10.1016/j.electacta.2011.07.037
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发表时间：
2011-10
影响因子：
6.6
通讯作者：
Xiaoying Zhang;Y. Hua;Cunying Xu;Zhang Qibo;Xiaohui Cong;N. Xu
中科院分区：
文献类型：
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作者：
Xiaoying Zhang;Y. Hua;Cunying Xu;Zhang Qibo;Xiaohui Cong;N. Xu
首次研究了在刘易斯型碱性AlCl 3 -1-丁基-3-甲基咪唑（AlCl 3-BMIC）离子液体中室温下二氧化钛（TiO 2）直接电化学还原为金属钛。在本研究中，循环伏安法，动电位极化，采样电流伏安法和X射线光电子能谱（XPS）技术被利用。循环伏安分析表明，TiO 2膜可被还原为金属Ti。采用采样电流伏安法对还原机理进行了研究，结果表明该还原过程可能包括两个步骤。当施加2.8V的输出电位差时，TiO 2圆柱形颗粒被部分还原为金属Ti。但由于反应速率非常缓慢，在48 h的电解时间内，只有约12wt%的TiO 2被还原。结果表明，在一定的阴极电位下，固体TiO 2的直接还原过程是在阴极/离子液体界面处发生的，在此界面处，氧被离子化，溶解在离子液体中，并在阳极放电，金属Ti留在阴极.
The direct electrochemical reduction of titanium dioxide (TiO2) to metallic titanium at room temperature is firstly studied in Lewis basic AlCl3–1-butyl-3-methylimidizolium (AlCl3–BMIC) ionic liquid. In this study, cyclic voltammetry, potentiodynamic polarization, sampled current voltammetry and X-ray photoelectron spectroscopy (XPS) techniques were utilized. Analysis of the cyclic voltammetry suggested that TiO2film can be reduced to metallic Ti. The sampled current voltammetry was applied to elaborate the reduction mechanism and the results showed that this reduction process may include two steps. When the output potential difference of 2.8V was applied, a TiO2cylindrical pellet was partly reduced to metallic Ti. However, due to the very slow reaction rate, there was only about 12wt% of TiO2was reduced during the electrolysis time of 48h. It was predicted that the process for the direct reduction of solid TiO2would be explained as follows: given enough cathode potential, the reduction happened at the cathode/ionic liquids interface, where the oxygen was ionized, then dissolved in the ionic liquid and discharged at the anode, with the metallic Ti left at the cathode.