Cu-Cu_2O壳核纳米粒子修饰电极检测过氧化物的研究

Cu-Cu_2O Core Shell Nanoparticle Modified Electrode for Determination of Organic Peroxides

通过调节硫酸铜溶液浓度,采用恒电位沉积方法,在玻碳电极表面制备了三种形貌的Cu-Cu2O壳核纳米粒子.比较研究了Cu-Cu2O壳核纳米粒子的形貌和结构对过氧化物的催化效果,发现立方八面体形的Cu-Cu2O壳核纳米粒子的催化效率较高.循环伏安法研究表明过氧化物在Cu-Cu2O修饰玻碳电极的还原电位在-0.23V,随着过氧化物浓度的增加,还原峰电流明显增大.用计时电流法,控制电位在-0.17V,Cu-Cu2O修饰玻碳电极可以检测过氧化氢异丙苯(CHP)、叔丁基过氧化氢(t-BHP)、过氧化丁酮(2-BP)和过氧化氢.

The cubic, cuboctahedral, and octahedral Cu-Cu2O core shell nanoparticles have been deposited on the surface of glassy carbon electrode by precisely controlling the CuSO4 concentration. The cuboctahedral Cu-Cu2O core shell nanoparticles possess higher catalysis to peroxides compare to the cubic and octahedral ones. Cyclic voltamometry investigations were made to estimate the reductive potential at -0.23V and emphasize the catalytic efficiency to peroxides. The electrocatalytic reaction of peroxides on the modified electrode is fast and stable. The calibration curves obtained from chronoamperometric studies was found to be linear in the wide concentration range with lower detection limits for the four peroxides such as cumene hydroperoxide, t-butyl hydroperoxide, 2-butanone peroxide and hydrogen peroxide.