新型Nd掺杂PbO2阳极性能及对AOII的电催化氧化研究

Performance of a novel Nd-doped PbO2 anode and electro-catalytic oxidation activity for the degradation of acid orange II

摘要:

采用电沉积法制备了稀土金属Nd改性PbO2电极（Nd-PbO2），并通过扫描电镜（SEM）、X射线衍射（XRD）、X射线光电子能谱（XPS）、荧光光谱（FP）、线性极化扫描（LSV）、强化寿命测试（ALT）、循环伏安扫描（CV）等方法表征了其表面结构和电化学性能，探讨了对酸性橙II（AOII）的电催化氧化性能。SEM、XRD、XPS测试结果表明，Nd以Nd3 形式掺杂进入电极镀层，同时对表面形貌、元素组成均有不同程度的改变，但不改变镀层表面的β-PbO2晶型；电化学性能测试表明，Nd掺杂可有效提高电极的析氧电位和稳定性；CV测试及AOII降解实验结果表明，Nd-PbO2电极对AOII还表现出直接氧化作用，电催化氧化AOII能力更强；FP分析表明，Nd-PbO2具有较强的催生羟基自由基能力，可增强电极降解有机物的催化活性。

Abstract:

A novel PbO2 electrode doped with rare earth of Nd (Nd-PbO2) was prepared by electrodepositon technique. The microstructure and electrochemical properties of the doped electrode were investigated using scanning electron microscopy (SEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), fluorospectrophotometry (FP), Linear-sweep voltammetry (LSV), accelerated lifetime (ALT) and cyclic voltammetry (CV). SEM, XRD and XPS analysis reveal that the Nd-PbO2 electrode is covered by β-PbO2 with tetragonal crystal structure and the main chemical valence of Nd is 3 , and the morphology and elementary composition of the electrode surface have changed at different degrees. Electrochemical performance tests show that doping with Nd can increase oxygen evolution reaction and stability of PbO2 electrode. The results of CV and AOII degradation experiments indicate that Nd-PbO2 electrode can enhance the direct anodic oxidation, which is helpful to mineralize AOII. Besides, the FP analysis reveals that the electrocatalytic activity of the Nd-PbO2 electrode in the degradation of organic materials is higher than that of the PbO2 electrode because more hydroxyl radicals can be generated on its surface.