硝基甲烷在离子液体BMImBF4中的电还原特性

采用循环伏安等测试方法, 以铂微盘电极为工作电极, 研究了硝基甲烷在离子液体1-正丁基-3-甲基咪唑四氟硼酸盐(BMImBF4)中的电化学行为, 并探讨了温度和扫描速率等因素对硝基甲烷电化学特性的影响. 实验结果表明, 硝基甲烷在离子液体BMImBF4中的还原反应是受扩散控制的不可逆过程. 估算了不同温度下硝基甲烷在离子液体BMImBF4中的扩散系数D, 进而求得它的扩散活化能Ea约为39.5 kJ·mol-1.

Electroreduction Characteristics of Nitromethane in Ionic Liquid BMImBF4

The electrochemical reduction of nitromethane was investigated in the room temperature ionic liquid 1- butyl-3-methylimidazolium tetrafiuoroborate (BMImBF_4) on a Pt disk microelectrode.The influences of temperature and scan rate on the electrochemical characteristics of nitromethane were also investigated by using cyclic voltammetry. The results showed that the electroreduction of nitromethane in BMImBF_4 was an irreversible process with one electron transferred,which was controlled by diffusion.Steady-state limiting currents for the electroreduction of nitromethane in BMImBF_4 at various temperatures were obtained.The diffusion coefficient was increased with temperature due to the diminution of the BMImBF_4 viscosity.In terms of Arrhenius equation,the activation energy (E_a) of diffusion of nitromethane in BMImBF_4 was calculated to be 39.5 kJ.mo1~(-1).