纳米铂直接修饰玻碳电极的制备及在半胱氨酸中的电化学行为  

Construction of Platinum Nanoparticles-attached Glassy Carbon Electrode and Its Electrocatalytic Activity for L-Cysteine

作　　者：濮文虹[1] 黄金桃[1] 钱功明[1] 张敬东[1] Munetaka Oyama 桂娟[1] 杨昌柱[1] 

机构地区：[1]华中科技大学环境科学与工程学院,武汉430074 [2]Division of Research Initiatives,International Innovation Center,Kyoto University,Sakyo-ku,Kyoto 606-8501,Japan

出　　处：《应用化学》2007年第8期868-872,共5页Chinese Journal of Applied Chemistry

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。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-modifled electrode and bulk platinum electrode is performed. The surface coverage rate（ 1.28×10^-7 mol/cm^2） 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.

关 键 词：化学原位一步还原法 纳米铂 半胱氨酸 玻碳 

分 类 号：O657.1[理学—分析化学]