离子液体中间硝基苯酚在玻碳电极上的电化学还原行为研究

Electrochemical Reduction Behavior of m-Nitrophenol on GC Electrode in Ionic Liquid [EMIM]Br

在 [EMIM]Br体系中 ,以玻碳为工作电极 ,铂丝为辅助电极 ,饱和甘汞电极为参比电极 ,研究了间硝基苯酚的电化学行为 .采用循环伏安法和计时电量法 ,研究了扫描速度、温度和底物浓度等因素对其电化学行为的影响 ,求得扩散系数 D为 9.1 84× 1 0 - 7cm2 /s,传递系数α为 0 .3 7,证明了在 [EMIM]Br体系中 ,此反应是受扩散控制的不可逆反应 .

The direct electrochemical reduction of m-nitrophenol on GC electrode was investigated in ionic liquid(IL), 1-ethyl-3-methylimidazolium bromide([EMIM]Br) by using cyclic voltammetry and chronocoulometry. The diffusion coefficient D of m-nitrophenol in [EMIM]Br was 9.184×10 -7 cm2/s, while the transfer coefficient was 0.37. It can be proved that the reduction of m-nitrophenol on GC electrode was an irreversible process and the electrode reaction was diffusion-controlled by cyclic voltammetry.