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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。
The spherical nano-platinum particles were directly modified on the glassy carbon electrode by a one-step chemical in situ reduction method. The electrode was characterized by SEM, EDS and electrochemical methods and compared with platinum electrode and bare glassy carbon electrode. The results show that the peak current of nano-platinum modified electrode has a linear relationship with the scanning speed. The coverage of nano-platinum on the electrode surface is 1.28 × 10-7mol / cm2. The results of cyclic voltammetry showed that the catalytic oxidation of cysteine at the platinum electrode was enhanced by several times and the peak potential was negatively shifted by 0.3V. The concentration of cysteine was linear with the catalytic current in the range of 1.0 × 10-7mol / L to 1.0 × 10-5mol / L on the nano-platinum-modified glassy carbon electrode.