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利用循环伏安法制备普鲁士蓝修饰玻碳电极(PB/GC),电极对对苯二酚具有良好的电催化作用,PB/GC电极上的氧化还原峰电流比裸电极大两个数量级,峰电位之差从0.83V减少到0.48V;考察了修饰电极膜的厚度与峰电流关系,当扫描圈数大于60圈时,峰电流不再随着薄膜厚度的增加而变大,峰电流与扫描速度的平方根呈线性关系,说明膜电极在界面传质为线性扩散控制;采用计时电量和电化学阻抗法研究对苯二酚的电化学行为,求得在不同厚度修饰电极膜上的扩散系数,此电极可用来快速检测对苯二酚。
Prussian blue modified glassy carbon electrode (PB / GC) was prepared by cyclic voltammetry. The electrode exhibited good electrocatalytic activity for hydroquinone. The redox current at the PB / GC electrode was two orders of magnitude larger than that of the bare electrode The potential difference is reduced from 0.83V to 0.48V; the relationship between the thickness of the modified electrode film and the peak current is investigated. When the number of laps is more than 60 laps, the peak current no longer increases with the increase of the film thickness. The square root of the velocity showed a linear relationship, indicating that the membrane electrode mass transfer at the interface was linear diffusion control. The electrochemical behavior of hydroquinone was studied by chronopotentiometry and electrochemical impedance spectroscopy to obtain the diffusion coefficient of the modified electrode membrane with different thickness, This electrode can be used to quickly detect hydroquinone.