电沉积法制备树枝状纳米银及其电催化性能研究
Study on Preparation and Electrocatalytic Properties of Dendritic Nano Silver Prepared by Electrodeposition

采用电沉积法室温条件下在浸入AgNO₃溶液的金箔表面制备了树枝状纳米银材料，施加电压为−0.3 V、电沉积时间为60 s、电解液含KNO₃ (0.1 M)和AgNO₃ (20 mM)，所制备的纳米材料利用扫描电子显微镜(SEM)、透射电子显微镜(TEM)、X射线衍射分析(XRD)、能量色散X射线光谱(EDX)等方法进行表征，根据表征结果分析了树枝状纳米银的晶体结构和形成机制；与未作任何修饰的裸Au电极相比，修饰了银纳米材料的Au电极对H₂O₂有明显的响应，在−0.35 V处出现明显的还原峰，证明树枝状纳米银对H₂O₂的还原有良好催化作用。

Abstract: Dendritic nanostructure silver material was synthesized on the surface of gold foil under the condition of being immersed in AgNO₃ solution by electro deposition method at room temperature, with applied voltage (−0.3 V), electrodeposition time (60 s), electrolyte containing KNO₃ (0.1 M) and AgNO₃ (20 mm). The prepared materials were characterized by SEM, TEM, XRD, EDX methods. The dendritic nano silver crystal structure and formation mechanism were analysed according to the characterization results. Compared with bare Au electrodes without any modification, the Au electrode modified with silver nano material has an obvious reduction peak of hydrogen peroxide at −0.35 V. It is proved that the dendritic nano silver has a good catalytic effect on the reduction of hydrogen peroxide.

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