室温离子液体六氟磷酸正丁基吡啶修饰碳糊电极的制备与表征  

Preparation and Characteristics of Room Temperature Ionic Liquid N-butylpyridinium Hexafluorophosphate Modified Carbon Paste Electrode

作　　者：孙伟[1] 高瑞芳[1] 毕瑞锋[1] 焦奎[1] 

机构地区：[1]青岛科技大学化学与分子工程学院,青岛266042

出　　处：《分析化学》2007年第4期567-570,共4页Chinese Journal of Analytical Chemistry

基　　金：国家自然科学基金(No20405008;20635020);青岛科技大学博士后科学基金(No0022125);山东省教育厅实验技术资助项目

摘　　要：以室温离子液体(RTIL)六氟磷酸正丁基吡啶(BPPF6)代替传统固体石蜡为粘合剂与石墨粉相混合制备了一种新型的离子液体修饰碳糊电极(RTIL/CPE)。优化出制备电极时石墨与BPPF6的比例为3∶1(w/w),采用扫描电子显微镜对其表面形貌进行了表征,以铁氰化钾为电化学探针对RTIL/CPE的电化学行为进行了研究,并与传统石蜡碳糊电极(CPE)进行了比较。结果表明由于BPPF6具有较高的导电性,使RTIL/CPE比CPE具有更高的导电效率,铁氰化钾在电极上的可逆性变好,ΔEp值为64mV,峰电流响应增加3.5倍,电极过程由吸附控制变为扩散控制,根据计时库仑法求解出铁氰化钾的扩散系数为1.39×10-4cm2/s。A new kind of room temper constructed based on the substitute of ature ionic liquid （RTIL） modified carbon paste electrode （CPE） was paraffin with N-butylpyridinium hexafluorophosphate （BPPF6） to mix with graphite powder. The optimal condition for preparation was selected as 3 ： 1 （w/w） for graphite powder and BPPF6. The surface morphologies of the RTIL/CPE were scanned by a scanning electron microscopy. The electrochemical behaviors of the RTIL/CPE was investigated by using K3[Fe（CN）6] as probe and compared with that of traditional CPE. The result showed that the electrochemical response of K3[Fe（CN）6] was greatly improved with the peak-to-peak separation as 64 mV and 3.5-fold increase of peak current, which was due to the high conductivity of BPPF6. On RTIL/CPE the electrode process of Fe（CN） 63-was changed from adsorption control to diffusion control and the diffusion coefficient was calculated by chronocoulometry with the results as 1.39×10^-4cm^2/s （25℃）.

关 键 词：六氟磷酸正丁基吡啶 室温离子液体 化学修饰电极 碳糊电极 铁氰化钾 

分 类 号：O657.1[理学—分析化学]