Abstract:

An elemental silver (Ag) doped Ti/PbO₂ electrode (Ti/Ag-PbO₂) was prepared by chemical reduction and electrodeposition. Three titanium-based lead dioxide electrodes with different Ag contents (Ti/Ag1-PbO₂、Ti/Ag2-PbO₂、Ti/Ag3-PbO₂) were prepared by changing the duration of silver plating while maintaining a constant silver plating concentration. The valence state and doping amounts of Ag in the PbO₂ electrode were determined by X-ray photoelectron spectroscopy (XPS) and X-ray fluorescence spectroscopy (XRF). Scanning electron microscopy (SEM) and X-ray diffraction (XRD) results showed that the Ag doping did not significantly change the surface morphology and crystal form of the electrode. According to the coating adhesion test, the silver-doped PbO₂ electrode showed stronger bonding force with the substrate, and the electrode life was improved by about 2.5 times. Electrochemical impedance spectroscopy (EIS) and cyclic voltammetry (CV) tests showed that the doping of Ag significantly reduced the charge transfer resistance of the PbO₂ electrode and improved the electrocatalytic activity of the electrode. The Ti/PbO₂ electrode doped with 2.7% silver was used to degrade 100mg/L phenol aqueous solution. Compared with the conventional Ti/PbO₂ electrode, the complete degradation time was shortened by 33.3%, and the degradation energy consumption decreased by 34%.

Key words: electrochemistry, degradation, oxidation, Ti/PbO₂ electrode

摘要：

使用化学还原和电沉积的方法制备了单质银（Ag）掺杂的Ti/PbO₂电极（Ti/Ag-PbO₂）。在保持镀银液浓度一定的条件下，通过改变镀银的时长制备出三种银含量的钛基体二氧化铅电极（Ti/Ag1-PbO₂、Ti/Ag2-PbO₂、Ti/Ag3-PbO₂）。利用X射线光电子能谱（XPS）和X射线荧光光谱分析（XRF）确定了PbO₂电极中Ag的价态和掺杂量。扫描电子显微镜（SEM）和X射线衍射（XRD）结果表明，Ag掺杂未明显改变电极的表面形态和晶型。根据涂层附着力测试试验发现，掺银PbO₂电极与基底之间有更好的结合力，电极使用寿命提高了约2.5倍。电化学交流阻抗谱（EIS）和循环伏安法（CV）测试结果表明，Ag的掺杂大幅降低了PbO₂电极的电荷转移电阻，提高了电极的电催化活性。利用掺银量2.7%（质量分数）的Ti/PbO₂电极降解100mg/L的苯酚水溶液，相较常规Ti/PbO₂电极，完全降解时间缩短了33.3%，降解能耗下降了34%。

关键词: 电化学, 降解, 氧化, Ti/PbO₂电极