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对于有机卤代物的电化学还原,银基纳米催化剂显示出优异的催化活性。采用简单的化学还原法制备Ag-Ni纳米颗粒(NPs),并采用X射线衍射、紫外-可见光谱、透射电镜以及能量散射谱等方法对制备的纳米催化剂进行表征。采用循环伏安法、计时电流法以及电化学阻抗谱在有机介质中研究Ag-Ni纳米颗粒对苄氯还原的电催化活性。结果表明:Ni元素的加入可明显减小Ag-Ni纳米颗粒的尺寸,使苄氯的还原峰电位φp正移且增加Ag-Ni纳米颗粒的催化活性。然而,当Ni的含量大于一定值后,Ag-Ni纳米颗粒的催化活性反而降低。同时,对Ag-Ni纳米颗粒的协同催化效应进行探讨。
Silver-based nanocatalysts show excellent catalytic activity for the electrochemical reduction of organic halides. Ag-Ni nanoparticles (NPs) were prepared by a simple chemical reduction method. The prepared nanocatalysts were characterized by X-ray diffraction, UV-Vis, TEM and energy dispersive spectroscopy. Cyclic voltammetry, chronoamperometry and electrochemical impedance spectroscopy were used to study the electrocatalytic activity of Ag-Ni nanoparticles in the reduction of benzyl chloride in organic media. The results show that the addition of Ni element can obviously reduce the size of Ag-Ni nanoparticles, make the reduction peak potential φp of benzyl chloride move forward and increase the catalytic activity of Ag-Ni nanoparticles. However, when the content of Ni is more than a certain value, the catalytic activity of Ag-Ni nanoparticles decreases instead. At the same time, the synergistic catalysis effect of Ag-Ni nanoparticles was discussed.