纳米金修饰电极上苯二酚的电催化及分析应用

利用恒电位沉积方法将HAuCl4直接还原成纳米金并沉积到玻碳电极表面。制备了对苯二酚异构体具有不同电催化作用纳米金修饰电极。在PBS缓冲溶液中，通过循环伏安法研究了苯二酚异构体及其混合物在纳米金修饰电极上的电化学行为，结果表明。苯二酚异构体在纳米金修饰电极上具有不同的电化学性质。对苯二酚和邻苯二酚在纳米金修饰电极上出现峰型良好的氧化还原峰，而间苯二酚几乎不产生氧化还原峰。比较对苯二酚和邻苯二酚在纳米金电极的的氧化还原峰。两者峰电位有较大区别，相互之间没有干扰，据此建立同时测定苯二酚混合物中的对苯二酚和邻苯二酚分析方法。

Electrocatalysis of Dihydroxybenzene at Gold Nanoparticles Modified Glassy Carbon Electrode and its Analytical Application

An AuNP-GCE was prepared by constant potential deposition of gold nanoparticles （AuNP） on the glassy carbon electrode （GCE） through direct reduction of HAuCh. The electrochemical behaviors for single solute and mixed systems of dihydroxybenzene isomers on the AuNP-GCE are investigated in PBS buffer solution （pH7.0） with cyclic votammetry technique. The results show that the AuNP-GCE exhibited different electrocatalytic effect toward isomers of dihydroxybenzene. Well-shaped redox peaks were observed on the AuNP-GCE by hydroquinone and catechol and no redox peak by resorcinol. In comparison with redox peaks, hydroquinone and catechol on the AuNP-GCE can be obviously distinguished in the mixed systems of isomers. Therefore,a novel method for simultaneous determination of hydroquinone and catechol in the mixed systems of isomers was satisfactorily established.