纳米TiO_2/CNT/ZrO_2膜电极的制备及其对2-吡啶甲醛的电催化还原  

Preparation of Nano-TiO_2/CNT/ZrO_2 Film Electrode and Its Electrocatalytic Reduction Property to 2-Pyridinaldehyde

作　　者：秦国旭[1] 程东[1] 李雷[1] 张敏[1] 万新军[1] 

机构地区：[1]巢湖学院化学与材料工程学院,安徽巢湖238000

出　　处：《过程工程学报》2015年第4期683-687,共5页The Chinese Journal of Process Engineering

基　　金：安徽高校省级自然科学基金资助项目(编号:KJ2013Z232);国家大学生创新训练基金资助项目(编号:201310380023)

摘　　要：通过溶胶-凝胶法在Ti表面修饰一层纳米Ti O2/CNT/Zr O2复合膜,采用循环伏安和电解合成法研究了复合膜电极在离子液体1-甲基-3-乙基咪唑四氟硼酸盐（[EMI]BF4）中对2-吡啶甲醛的电催化还原活性.结果表明,复合膜为多孔网状结构,粒径约20 nm的Ti O2和Zr O2晶粒负载在管径40-60 nm的碳纳米管（CNT）上,纳米Ti O2中掺杂Zr O2和CNT后电极催化性能显著改善.在[EMI]BF4中,控制电位为-1.40 V,用复合膜电极作阴极,Ti（Ⅳ）/Ti（Ⅲ）氧化还原电对作为媒质间接电还原2-吡啶甲醛为2-哌啶甲醇,平均电流效率为85.6%,产率为83%.反应机理为电化学偶联随后化学催化反应.Nano-TiOz/CNT/ZrO2 complex film was prepared by sol-gel process, on the nanoTiO2/CNT/ZrO2 composite film electrode, electrocatalytic reduction of 2-pyridinaldehyde in the ionic liquid electrolyte of 1-ethyl-3-methylimidazolium tetrafluoroborate （[EMI]BF4） was studied by cyclic voltammetry and bulk electrolysis. The results showed that the composite film had a porous mesh structure, TiO2 and ZrO2 particles were about 20 nm, which were loaded on carbon nanotubes （CNT） with the diameter of about 40-60 nm, the catalytic performance of nano-TiO2 modified by ZrO2 and CNT was greatly improved. In the indirect electroreduction of 2-pyridinaldehyde to 2-piperidinemethanol by Ti（IV）/Ti（III） redox system on nanoTiO2/CNT/ZrO2 complex film surface in [EMI]BF4, the yield and current efficiency were approximately 83% and 85.6% at -1.40 V, respectively. The electrode reaction mechanism was the called catalytic mechanism.

关 键 词：电催化还原 离子液体 纳米TiO2/CNT/ZrO2 电极 2-吡啶甲醛 

分 类 号：O646[理学—物理化学] TQ031.7[理学—化学]