Zn掺杂CuO修饰电极的制备及电化学催化检测H_2O_2

利用滴涂法将Zn掺杂CuO纳米颗粒修饰到玻碳电极表面,通过循环伏安法和计时电流法,研究了Zn掺杂CuO纳米颗粒对H_2O_2的电催化性质。结果表明,制备了粒径为80~100nm的纳米颗粒,且分散良好。Zn掺杂CuO纳米颗粒修饰电极对H_2O_2具有良好的电催化还原作用。在pH=7.0的磷酸盐缓冲液中,当扫描速度介于20~350mV/s时,其氧化峰和还原峰电流均与扫描速度呈线性关系,说明电化学过程受吸附控制。探讨了支持电解质及pH值的影响,当H_2O_2的浓度在1.0×10~(-6)~6.3×10~(-3) mol/L浓度范围内时,还原峰电流与浓度呈良好的线性关系,检出限为0.1μmol/L。该传感器具有选择性高、重现性和稳定性好等特点。

Zinc-doped Copper Oxide Modified Electrode for Sensitive Determination of Hydrogen Peroxide by Simple Hydrothermal Synthesis

Zn-doped CuO nanoparticle composite was synthesized by hydrothermal method,using glucose as template,zinc and copper nitrate as raw materials.The products were characterized by SEM.The as-prepared Zndoped CuO nanocomposite modified glassy carbon electrode shows remarkable electrochemical performance for non-enzymatic H2O2 detection by means of cyclic voltammetry and chronoamperometry.In the scan rate range from 20 to 350 mV/s,the anodic and cathodic peak current has linear relationship with scan rate.It shows that the electrochemical process was controlled by diffusion.The choice of supporting electrolyte and the effect of pH value was also discussed in detail.The modified sensor exhibited excellent catalytic activity towards electrochemical reduction of hydrogen peroxide.The cathodic current is proportional to the concentration of hydrogen peroxide over the concentration range of 1.0×10-6to6.3×10-3 mol/L.The detection limit of the method was down to 0.1μmol/L(S/N=3).Furthermore,results also showed that the sensor has good selectivity,stability and reproducibility.