采用电沉积方法制备银铜双金属纳米合金, 用X射线衍射仪(XRD)及高分辨率透射电子显微镜(HRTEM), 扫描电子显微镜(SEM)和电化学工作站分别对样品的结构、微观形貌和电催化性质进行了表征。结果表明, 银铜双金属纳米合金电极在H2O2溶液中表现出较强的还原电流, 可以作为阴极催化剂; 随着银铜双金属纳米合金沉积电位的变负, 阴极催化作用减弱, 形貌由穗状晶向树枝晶转变; 随着铜离子浓度的提高, 阴极催化作用增强, 银铜双金属纳米合金的形貌由树枝晶向棒状晶转变。这意味着, 本文观察到了银铜双金属纳米合金的双金属电催化协同效应。
Silver–copper (Ag–Cu) bimetallic nanoalloys were prepared by electrodeposition methods and their microstructure, morphology and electrocatalytic properties were characterized by XRD, HRTEM, SEM and electrochemical workstation. The results show that the silver–copper bimetallic nanoalloy electrodes exhibit a large reduction current peak in H2O2 solutions, indicating that silver-copper bimetallic nanoalloy can be used as a cathode catalytic. The morphology of silver-copper bimetallic nanoalloys changes from spiciform crystal to dendritic crystal and the cathode catalytic performance decreases with increasing deposition potential; The morphology of the nanoalloys changes from dendritic crystal to rod-shaped crystal and the cathode catalytic performance increases with the increasing of Cu2+ concentrations. It can be concluded that the synergistic effects are observed in the electrocatalytic performance for silver-copper bimetallic nanoalloys.
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