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首页> 外文期刊>International Journal of Electrochemical Science >Fabrication and Electrocatalytic Performance of a Two- Dimensional β-PbO2 Macroporous Array for Methyl Orange Degradation
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Fabrication and Electrocatalytic Performance of a Two- Dimensional β-PbO2 Macroporous Array for Methyl Orange Degradation

机译：二维β-PbO 2 大孔阵列对甲基橙降解的制备及电催化性能

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摘要

To further improve the electrocatalytic degradation activity of PbO 2 electrodes for refractory organicpollutant treatment, a novel two-dimensional β-PbO 2 macroporous array electrode (2D-PbO 2 ) wasfabricated by electrochemical deposition based on a two-dimensional colloidal crystal template, whichwas constructed using the Langmuir-Blodgett film technique. The structure and surface morphology of2D-PbO 2 electrodes and traditional flat electrodes (Flat-PbO 2 ) were characterized by scanning electronmicroscopy (SEM) and X-ray diffraction (XRD). The anode polarization curves, cyclic voltammetry(CV) curves and electrochemical impedance spectroscopy (EIS) measurements were investigated tocompare the electrocatalytic activity of the two kinds of electrodes. The electrocatalytic degradation ofmethyl orange (MO) was performed by CV, and UV spectroscopy was used to monitor changes duringthe electrocatalytic degradation process. The results show that the as-prepared electrode exhibited atwo-dimensional ordered micron spherical cavity array structure with a large specific surface area. Thecoating surface is composed of single β-PbO 2 microcavities 5-6 μm in size, and the spacing of themicron holes is approximately 2 μm. Compared with the Flat-PbO 2 electrodes, the 2D-PbO 2 electrodesshow a higher exchange current density (j 0 =1.478×10 -5 A·cm -2 ), smaller apparent activation energy(E a =12.09 kJ·mol -1 ), larger electric double layer capacitance (C dl =60 μF·cm -2 ) and smaller chargetransfer resistance (R ct =16.89 Ω·cm 2 ), resulting in better electrocatalytic performance. In theelectrocatalytic degradation process of MO, the conjugated chromophore group in the molecularstructure of MO has been damaged by direct oxidation methods. The reaction followed pseudo first-order kinetics, and the value of the apparent rate constant (k app ) is 0.06814 min -1 , approximately 2.35times that of the Flat-PbO 2 electrodes (0.02902 min -1 ). The electrocatalytic degradation efficiency wassignificantly improved.
机译：为了进一步提高PbO 2电极对难降解有机污染物的电催化降解性能，基于二维胶体晶体模板，通过电化学沉积法制备了新型二维β-PbO2大孔阵列电极（2D-PbO 2）。使用Langmuir-Blodgett电影技术。通过扫描电子显微镜（SEM）和X射线衍射（XRD）表征了2D-PbO 2电极和传统平板电极（Flat-PbO 2）的结构和表面形态。研究了阳极极化曲线，循环伏安法（CV）曲线和电化学阻抗谱（EIS）测量结果，以比较两种电极的电催化活性。甲基橙（MO）的电催化降解通过CV进行，紫外光谱用于监测电催化降解过程中的变化。结果表明，所制备的电极具有较大的比表面积的二维有序微米球面阵列结构。涂层表面由大小为5-6μm的单个β-PbO2微腔组成，微米孔的间距约为2μm。与Flat-PbO 2电极相比，2D-PbO 2电极显示更高的交换电流密度（j 0 = 1.478×10 -5 A·cm -2），表观活化能更小（E a = 12.09 kJ·mol -1） ），更大的双电层电容（C dl = 60μF·cm -2）和较小的电荷转移电阻（R ct = 16.89Ω·cm 2），从而具有更好的电催化性能。在MO的电催化降解过程中，MO分子结构中的共轭发色基团被直接氧化方法破坏。该反应遵循伪一级动力学，表观速率常数（k app）的值为0.06814 min -1，约为Flat-PbO 2电极（0.02902 min -1）的2.35倍。电催化降解效率明显提高。

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