论文部分内容阅读
采用熔盐电脱氧法,以石墨固定的氧化物粉末为阴极,石墨棒为阳极,NaC1-CaC1_2混合熔盐为电解质,石墨坩埚为电解槽在800℃低温熔盐中制备金属Ti.进行不同电解时间的电脱氧实验,研究了阴极产物.分别以石墨和钼为工作电极、对电极和参比电极,对TiO_2电脱氧还原的过程进行了动力学研究,测定了循环伏安曲线.结果表明:未烧结TiO_2粉末经过40h的恒压电解后,TiO_2还原成Ti;石墨电极虽然有较宽的电化学窗口,但是电极活性高、表面积大,不能在高温条件下作为CV曲线电极材料使用;钼的电化学性质稳定,是比较理想的电极材料;二氧化钛的电化学还原分四步进行:TiO_2/Ti_3O_5,Ti_3O_5/Ti_2O_3,CaTi_2O_a/TiO,TiO/T,前两步都伴随CaTiO_3与CaTi_2O_4的自发形成.
Using molten salt deoxidation method, graphite oxide powder as cathode, graphite rod as anode, NaC1-CaC1_2 mixed molten salt as electrolyte, and graphite crucible as electrolytic bath to prepare metal Ti at 800 ℃ low temperature molten salt. Time deoxidation experiments were carried out to study the cathodic products.The kinetics of the electro-deoxidation of TiO 2 was studied by using graphite and molybdenum as the working electrode respectively.The cyclic voltammetry curves were measured.The results showed that: After un-sintered TiO_2 powder is subjected to constant voltage electrolysis for 40h, the TiO_2 is reduced to Ti. Although the graphite electrode has a wide electrochemical window, the electrode has high activity and large surface area and can not be used as a CV curve electrode material under high temperature. Electrochemical reduction of titanium dioxide is an ideal electrode material. Electrochemical reduction of TiO 2 is carried out in four steps: TiO 2 / Ti 3 O 5, Ti 3 O 5 / Ti 2 O 3, CaTi 2 O 3 / TiO 2 and TiO 2 / TiO 2. The first two steps are accompanied by spontaneous formation of CaTiO 3 and CaTi 2 O 4.