糠醛在碳纳米管修饰电极上的电化学行为  

Electrochemical behavior of furfural on carbon nanotubes modified electrode

作　　者：林永平[1] 付艳辉[2] 陈天生[1] 王立世[2] 

机构地区：[1]广东电网公司电力科学研究院,广州510080 [2]华南理工大学化学与化工学院,广州510640

出　　处：《上海师范大学学报（自然科学版）》2012年第1期75-79,共5页Journal of Shanghai Normal University(Natural Sciences)

摘　　要：采用N,N-二甲基甲酰胺分散碳纳米管(CNT),制备碳纳米管修饰玻碳电极.运用循环伏安法和Tafel曲线法,研究了糠醛在碳纳米管修饰玻碳电极上的电化学行为.实验结果表明:在浓度为0.1 mol/L的磷酸盐缓冲溶液(pH 6.8)中,碳纳米管修饰电极对糠醛具有良好的催化作用.在扫速为50～1000mV/s的范围内,糠醛的还原峰电流与扫速的平方根成良好的线性关系,表明糠醛在碳纳米管修饰电极上的氧化还原过程是受扩散控制的.在pH值为4～10的范围内,随着pH值的增大,糠醛的还原峰电位逐渐负移.通过Tafel曲线、峰电位与pH值的线性关系,计算得到电化学过程中参加反应的电子数为2,质子数为1,电极反应的电子转移系数为0.644.A modified electrode of carbon nanotubes （CNME） was prepared by coating N, N - dimethylformamide on glassy carbon electrode. Electrochemical behavior of the CNME was studied by using cyclic voltametry and Tafel curve, which showed good catalytic effect on furfural in 0.1 mol/L phosphate buffer solution（pH 6.8）. In the scanning rate range of 50 -1000 mv/s,the reduction peak currents had a good linear relationship with the square roots of the scanning rates, indicating that the redox process of furfural on CNME was a diffusion -limited electrochemical process. In the pH value range of 4 - 10, the potential of the reduction peak of furfural shifted negatively gradually with the pH value increasing. Based on Tafel curve and, the linear relationship between the peak potential and the pH value, the electron numbers and the proton numbers, participating in the reaction were cal culated as two and one, respectively. Meanwhile, the transfer coefficient was 0.644.

关 键 词：糠醛 碳纳米管 修饰电极 电化学行为 

分 类 号：O657.1[理学—分析化学]