Fabrication of three-dimensional networked PbO2 anode for electrochemical oxidation of organic pollutants in aqueous solution
Fabrication of three-dimensional networked PbO2 anode for electrochemical oxidation of organic pollutants in aqueous solution
复制标题
三维网络化PbO2阳极的制备用于电化学氧化水溶液中的有机污染物
DOI：
10.1016/j.jtice.2019.04.007
复制
发表时间：
2019
影响因子：
5.7
通讯作者：
Chang Limin
中科院分区：
文献类型：
--
作者：
Sui Xinyu;Duan Xiaoyue;Xu Feng;Chang Limin
为了提高PbO2阳极的电催化性能，以钛网为衬底，制备了三维网络状PbO2(3dN-PbO2)阳极。采用扫描电子显微镜、X射线衍射仪、X射线光电子能谱、·OH产生测试、循环伏安、交流阻抗谱以及对硝基苯酚(p-NP)的电化学氧化等方法对3dN-PbO2阳极的形貌、结构、组成和电化学性能进行了表征。与传统的二维平面PbO2(2DP-PbO2)阳极相比，3dN-PbO2阳极具有更小的晶体尺寸、更致密的结构、更多的化学吸附氧、更强的·OH自由基产生能力、更丰富的活性中心和更小的电子转移阻力，从而对p-NP的降解具有更好的电催化性能。P-NP在3dN-PbO2阳极上的降解速率常数(Kapp)为0.0489 -1，是2DP-PbO2阳极(0.0229 min-1)的2倍多。此外，还考察了操作参数(电流密度、pH值、温度)对p-NP降解的影响以及p-NP的降解途径。最后，通过15次电化学氧化试验和加速寿命试验对电极的稳定性进行了评价，3dN-PbO2和2DP-PbO2电极对p-NP的降解均表现出较高的重复使用性。
To improve the electrocatalytic performance of PbO2anode, the titanium mesh was used as substrate to fabricate a three-dimensional networked PbO2(3DN-PbO2) anode. The morphology, structure, composition, and electrochemical performance of 3DN-PbO2anode were evaluated using scanning electron microscopy, X-ray diffraction, X-ray photoelectron spectroscopy, ·OH radicals generation test, cyclic voltammetry, electrochemical impedance spectroscopy, as well as electrochemical oxidation ofp-nitrophenol (p-NP). Compared with traditional two-dimensional planar PbO2(2DP-PbO2) anode, the 3DN-PbO2anode possessed smaller crystal size, more compact structure, more chemisorption oxygen, stronger ·OH radicals generation ability, more abundant active sites, and smaller electron transfer resistance, resulting in better electrocatalytic performance for degradation ofp-NP. The degradation rate constant (kapp) ofp-NP on 3DN-PbO2anode was 0.0489 min–1, more than 2 times that of 2DP-PbO2anode (0.0229 min–1). In addition, the influence of operating parameters (current density, pH and temperature) on thep-NP degradation and the degradation pathway ofp-NP were also investigated. Finally, the stability of electrodes was estimated using 15-cycle electrochemical oxidation test and accelerated lifetime test, and both of 3DN-PbO2and 2DP-PbO2electrodes exhibited high reusability forp-NP degradation.