Ag/PbO2电极的制备及其光电协同性能

Preparation of Ag/PbO2 electrode and its photoelectric synergistic properties

制备了一种新型Ag/PbO2复合电极,并采用X射线衍射、扫描电子显微镜、X射线能谱分析、紫外可见吸收光谱、电化学工作站等对其进行了系统表征。结果表明,相较于纯氧化铅电极,该复合电极具有大的电活性面积、低的电荷转移阻抗和较高的羟基自由基生成效率。采用染料(活性艳蓝)溶液脱色考察了Ag/PbO2复合电极的光电化学性能。光电催化降解实验显示纯PbO2电极的染料降解率仅为59.4%,而Ag/PbO2复合电极对染料的降解率达到79.2%。Ag/PbO2复合电极光电化学能力的提高可归因于Ag的引入改善了PbO2电极的电化学性能和反应活性物的生成效率。本研究为Ag/PbO2电极在难降解有机污染物处理中的应用提供了理论实验基础。

A new Ag/PbO2 composite electrode was prepared and characterized by X ray diffraction(XRD),scanning electron microscopy(SEM),energy dispersive X ray spectroscopy(EDS),UV-Vis absorption spectrum and electrochemical workstation.The results show that the composite electrode has large electroactive area,low charge transfer resistance and high hydroxyl radical formation efficiency.The photoelectrochemical(PEC)properties of Ag/PbO2 composite electrode were studied by decolorizing the dye(reactive brilliant blue)in aqueous solution.PEC test showed that the degradation rate of pure PbO2 electrode and Ag/PbO2 composite electrode was 59.4%and 79.2%,respectively.The improvement of PEC capability of Ag/PbO2 composite electrode can be attributed to that Ag addition improves electrochemical performance of PbO2 electrode,and enhances generation efficiency of reactive active species.This work provides an experimental basis for the application of Ag/PbO2 electrode in the treatment of refractory organic pollutants.