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.
出处
《过程工程学报》
CAS
CSCD
北大核心
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)
