Department of Chemistry, Tongji University, 1239 Siping Road, 200092 Shanghai, China.
Environ Sci Technol. 2010 Mar 1;44(5):1754-9. doi: 10.1021/es902336d.
A novel PbO(2) electrode with a high oxygen evolution potential (OEP) and excellent electrochemical oxidation performance is prepared to improve the traditional PbO(2) electrode, which is modified by changing the microstructure and wetting ability. A middle layer of TiO(2) nanotubes (NTs) with a large surface area is introduced on Ti substrate, and a small amount of Cu is predeposited at the bottom of TiO(2)-NTs. The modification will improve the electrochemical performance by enhancing the loading capacity of PbO(2) and the combination between PbO(2) and Ti substrate. The hydrophilic surface becomes highly hydrophobic by adding fluorine resin. The improved PbO(2) electrode exhibits a similar morphology, surface wetting ability, high OEP, and electrochemical performance with boron-doped diamond film (BDD) electrode. However, the physical resistance of the PbO(2) electrode is much lower than that of BDD, exhibiting higher conductivity. The hydroxyl radical utilization is significantly enhanced, resulting in a higher oxidation rate and higher removal for 2,4-dichlorophenoxyacetic acid.
一种具有高析氧电位（OEP）和优异电化学氧化性能的新型 PbO(2)电极被制备出来，以改善传统的 PbO(2)电极，通过改变微观结构和润湿性对其进行改性。在 Ti 基体上引入具有大表面积的 TiO(2) 纳米管（NTs）中间层，并在 TiO(2)-NTs 底部预先沉积少量 Cu。这种修饰通过增强 PbO(2)的负载能力以及 PbO(2)与 Ti 基体的结合来提高电化学性能。通过添加氟树脂，亲水表面变得高度疏水。改进后的 PbO(2)电极在形貌、表面润湿性、高 OEP 和电化学性能方面与掺硼金刚石薄膜（BDD）电极相似。然而，PbO(2)电极的物理电阻远低于 BDD，表现出更高的导电性。羟基利用率显著提高，导致 2,4-二氯苯氧乙酸的氧化速率和去除率更高。
