Ag-Ni alloy nanoparticles for electrocatalytic reduction of benzyl chloride  

Ag-Ni合金纳米粒子对苄氯还原的电催化(英文)

作　　者：周海晖[1,2] 李艳玲[1,2] 黄家琦[1,2] 方晨旭 单丹[1,2] 旷亚非[1,2] 

机构地区：[1]湖南大学化学/生物传感与计量学国家重点实验室,长沙410082 [2]湖南大学化学化工学院,长沙410082

出　　处：《Transactions of Nonferrous Metals Society of China》2015年第12期4001-4007,共7页中国有色金属学报（英文版）

基　　金：Projects(21271069;51238002;J1210040;J1103312)supported by the National Natural Science Foundation of China;Project(2013GK3015)supported by the Science and Technology Project of Hunan Province;China

摘　　要：Ag-based nanocatalysts exhibit good catalytic activity for the electrochemical reduction of organic halides. Ag-Ni alloy nanoparticles（NPs） were facilely prepared by chemical reduction, and the as-prepared nanocatalysts were characterized by X-ray diffraction, ultraviolet-visible spectroscopy, transmission electron microscopy and energy-dispersive X-ray spectroscopy. The electrocatalytic activity of Ag-Ni NPs for benzyl chloride reduction was studied in organic medium using cyclic voltammetry, chronoamperometry and electrochemical impedance spectroscopy. The results show that the addition of Ni element can obviously decrease the size of Ag-Ni NPs, shift the reduction peak potential（φp） of benzyl chloride positively, and increase the catalytic activity of Ag-Ni NPs. However, when the Ni content reaches a certain value, the catalytic activity of Ag-Ni NPs decreases. Meanwhile, the synergistic catalytic effect of Ag-Ni NPs was also discussed.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。

关 键 词：Ag-Ni nanoparticles benzyl chloride synergistic catalytic effect ELECTROREDUCTION 

分 类 号：O643.36[理学—物理化学]