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采用电化学还原方法制备了铁氰化镍-石墨烯复合薄膜电极,扫描电子显微镜(SEM)表征电还原石墨烯和铁氰化镍-石墨烯复合材料的表面形貌。采用循环伏安和计时电流技术研究了该修饰电极对抗坏血酸(AA)的电催化氧化性能,据此建立了一种测定AA的电化学分析新方法。由于石墨烯和铁氰化镍纳米颗粒之间的协同效应,使得该复合修饰电极对抗坏血酸具有优异的电催化活性。在0.1 mol/L pH 7.00的PBS溶液中,抗坏血酸的催化氧化电流与其浓度在1.0×10-4~7.0×10-4mol/L范围内呈良好的线性关系,检出限为3.1×10-5mol/L(S/N)。
Electrodeposition of nickel (II) cyanide-graphene composite thin film electrodes was carried out by electrochemical reduction method. The surface morphology of electroreduced graphene and Ni-Fe-Ni-Graphene composites was characterized by scanning electron microscopy (SEM). The electrocatalytic oxidation of ascorbic acid (AA) was studied by cyclic voltammetry and chronoamperometry. A new electrochemical method for the determination of AA was established. Due to the synergistic effect between the graphene and the nickel ferricyanide nanoparticles, the composite modified electrode has excellent electrocatalytic activity on ascorbic acid. In 0.1 mol / L PBS with pH 7.00, the oxidation current of ascorbic acid showed a good linear relationship with the concentration of 1.0 × 10-4 ~ 7.0 × 10-4 mol / L with the detection limit of 3.1 × 10-5 mol / L (S / N).