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采用压电电化学石英晶体微天平(EQCM)技术研究了硫酸重氮盐在裸金电极(Au)和多壁碳纳米管(MWCNTs)修饰金电极上的电还原行为,比较了2种电极上电沉积质量和稳定性。结果表明,相同循环伏安扫描条件下,重氮盐在金电极和MWCNTs/Au电极上的工作曲线还原峰电位相同,后者的初始峰电流低于前者,QCM数据显示重氮盐在MWCNTs/Au电极上沉积速度优于金电极,饱和沉积量是金电极上的3倍,表明碳纳米管催化了还原过程并增大了电极的表面积;在磷酸中性缓冲溶液中浸泡7 d后,重氮盐修饰后的MWCNTs/Au电极表面质量变化比金电极小0.28ng,表明修饰后的MWCNTs/Au电极略稳定。
The electrochemical reduction behavior of diazo-sulfate salt on bare gold electrode and MWCNTs modified gold electrode was investigated by piezoelectric-electrochemical quartz crystal microbalance (EQCM) Electrodeposition quality and stability. The results show that under the same cyclic voltammetry conditions, the reduction peak potential of the diazonium salt on the gold electrode and the MWCNTs / Au electrode is the same, the latter initial peak current is lower than the former, QCM data show that the diazonium salt in the MWCNTs / Au electrode deposition rate is better than the gold electrode, the saturation deposition is 3 times the gold electrode, indicating that the carbon nanotubes catalyzed the reduction process and increase the electrode surface area; immersed in phosphate neutral buffer solution after 7 d The surface quality of the modified MWCNTs / Au electrode was 0.28 ng smaller than that of the gold electrode, indicating that the modified MWCNTs / Au electrode was slightly stable.