摘要
分别用循环伏安法、计时电量法和交流阻抗法考察了离子液体1-丁基-3-甲基咪唑六氟磷酸盐([BMIM]PF6)对酪氨酸酶碳糊电极(T-CPE)电化学行为的影响。结果表明:离子液体酪氨酸酶碳糊电极(T-CPE-IL)比T-CPE对邻苯二酚有更灵敏的响应。离子液体的加入改善了T-CPE的表面性能,使邻苯二酚在电极表面的吸附电量由2.08mC增至5.67mC,电子转移标准速率常数增加了约2个数量级,使电极反应的控制步骤由受电子转移控制转化为受扩散控制。
The effect of ionic liquid, 1-butyl-3-methyl-imidazolium hexafluorophosphate （[BMIM]PF6）,on the electrochemical behaviors of tyrosinase carbon paste electrode （T-CPE） was studied with cyclic voltammograms, chronocoulometry and alternative current impedance spectroscopy,respectively. Ionic liquid tyrosinase carbon paste electrode （T-CPE-IL） presented higher sensitivity and faster response-time for catechol than that of T-CPE. The addition of [BMIM]PF6 could modify the surface characteristics of T-CPE,increase the adsorption capacity of catechol on the surface of the electrode from 2.08mC to 5.67mC,and greatly increase the standard rate constant of electron transfer more than 2 magnitudes. Moreover, the electrode reaction changed from electron transfer control to diffusion control.
出处
《光谱实验室》
CAS
CSCD
2008年第5期883-886,共4页
Chinese Journal of Spectroscopy Laboratory
关键词
离子液体
酪氨酸酶
碳糊电极
Ionic Liquid,Tyrosinase,Carbon Paste Electrode.
