双核磺化酞菁钴-表面活性剂薄膜电极对巯基乙醇的电催化氧化

Electrocatalytic Oxidation of 2-mercaptoethanol by Binuclear Cobalt Hexasulfonated Phthalocyanine-Surfactant Film Modified Electrode

采用双核磺化酞菁钴-DDAB表面活性剂修饰电极在碱性溶液中利用Co（Ⅱ）/Co（Ⅲ）电对催化氧化巯基乙醇.结果显示：在pH为10～13.5的溶液中,巯基乙醇的催化电位为-50～-60 mV,在pH为11时,催化效果最好.当巯基乙醇浓度在5.0×10-3～7×10-2mol/L时,氧化峰电流随浓度线性增加;当浓度为7×10-2mol/L,扫速为100～700 mV/s时,峰电流与扫速平方根成正比,表明反应为扩散控制过程.

Chemically modified electrodes,constructed by attaching binuclear cobalt hexasulfonated phthalocyanine to didodecyldimethylammonium bromide（DDAB） on glass carbon（GC） electrode were used to catalyze the oxidation of 2-mercaptoethanol（2-ME） in a series of basic solutions.The oxidation of 2-ME exhibited at about-50～-60 mV at pH 10～13.5 and the best catalytic result was obtained in pH 11 buffer solution.The anodic peak currents varied linearly with their concentrations in the range 5.0×10-3to 7×10-2mol/L.Peak current for the anodic oxidation of 2-ME was proportion to the square root of the scan rate in the range 100～700 mV/s when the concentration of 2-ME was 7×10-2mol/L.It showed the reaction was controlled by diffusion.