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《Chinese Journal of Analytical Chemistry》 2007-04
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Preparation and Characteristics of Room Temperature Ionic Liquid N-butylpyridinium Hexafluorophosphate Modified Carbon Paste Electrode

Sun Wei, Gao Rui-Fang, Bi Rui-Feng, Jiao Kui(College of Chemistry and Molecular Engineering, Qingdao University of Science and Technology, Qingdao 266042)  
A new kind of room temperature ionic liquid (RTIL) modified carbon paste electrode (CPE) was constructed based on the substitute of 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)3-6 was changed from adsorption control to diffusion control and the diffusion coefficient was calculated by chronocoulometry with the results as 1.39×10-4 cm2/s (25℃).
【Fund】: 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
【CateGory Index】: O657.1
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