【摘要】 采用一步化学原位还原法将球形纳米铂颗粒直接修饰在玻碳电极上,用SEM、EDS和电化学方法对该电极进行表征并与铂片电极、裸玻碳电极进行了对比。结果表明,纳米铂修饰电极的峰电流与扫描速度呈线性关系,纳米铂在电极表面覆盖率为1.28×10-7mol/cm2。循环伏安法研究结果表明纳米铂修饰电极对半胱氨酸的催化氧化作用和铂片电极相比提高了数倍,且峰电位负移了0.3V。在纳米铂修饰的玻碳电极上,半胱氨酸的浓度在1.0×10-7mol/L到1.0×10-5mol/L范围内和催化电流呈线性关系。更多还原

【Abstract】 A novel glassy carbon electrode modified with spherical platinum nanoparticles was prepared by means of a one-step in situ chemical reduction growth method.Electrochemical method SEM and EDS for surface analysis were employed to characterize the platinum nanparticles modification on the electrode surface.The comparison of the electrochemical properties of bare glassy carbon electrode,platinum nanoparticles-modified electrode and bulk platinum electrode is performed.The surface coverage rate(1.28×10-7 mol/cm2) of platinum on glassy carbon electrode was calculated based on the linear relationship between peak current of Pt and scan rate.The results show that the modified electrode exhibited an effective response to the oxidation of L-Cysteine.Compared with that of Pt bulk electrode,the electrocatalytic oxidation potential of L-Cysteine on modified electrode has shifted negatively by 0.3 V with a remarkable enhancement in oxidation peak current.The linear relationship existed between the L-Cysteine concentration and the catalytic peak current in a range of 1.0×10-7 mol/L to 1.0×10-5 mol/L at the modified electrode.更多还原