Preparation and Electrocatalytic Performance of Three-Dimensional Porous Structure PbO 2 Electrodes Using Oxygen Bubble as Dynamic Templates

Abstract

The three-dimensional porous structure PbO2 electrodes (3D-PbO2) were successfully prepared in the lead nitrate solution by potentiostatically electrodeposition methods using oxygen bubbles as dynamic template. The morphology and structure of 3DPbO2 electrodes were investigated by scanning electronic microscopy (SEM) and X-ray diffraction (XRD). Compared with the traditional PbO2 electrodes (Flat-PbO2), 3D-PbO2 electrodes possess the three-dimensional porous structure and finer grain size. The electrochemical properties of 3D-PbO2 electrodes were investigated by linear sweep voltammetry (LSV), cyclic voltammetry (CV) and electrochemical impedance spectrum (EIS). The 3D-PbO2 electrodes show larger electrochemical active surface area, lower charge transfer resistance and higher oxygen evolution overpotential than Flat-PbO2 electrodes. In the electrocatalytic degradation process ofmalachite green, the degradation rate constant of 3D-PbO2 electrodes (0.05189 min-1)was 5.8 times than that of Flat-PbO2 electrodes (0.00889 min-1).