Abstract
In this study, PbO2 electrode was prepared on porous Ti/SnO2–Sb2O5 substrate (denoted as 3D-Ti/PbO2 electrode), and its electrochemical properties were investigated in detail. The electrodeposition mechanism of 3D-Ti/PbO2 electrode was investigated by cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS). Scanning electron microscope (SEM) result showed that the 3D-Ti/PbO2 electrode possessed porous structure when it was electrodeposited for time less than 30 min. The 3D-Ti/PbO2 electrode prepared for 10 min had more active sites than the lead dioxide electrode electrodeposited on planar titanium substrate (denoted as 2D-Ti/PbO2 electrode) and its electrochemical porosity is about 54%. The embedded structure between porous Ti/SnO2–Sb2O5 substrate and PbO2 coating increased the stability of 3D-Ti/PbO2 electrode. The service life of 3D-Ti/PbO2 electrode was about 350 h which was much longer than 2D-Ti/PbO2 electrode. What's more, 3D-Ti/PbO2 electrode had better electrocatalytic activity towards phenol degradation than 2D-Ti/PbO2 electrode.
[Display omitted]
•3D-Ti/PbO2 electrode was prepared on a porous titanium substrate.•The electrochemical active surface area was investigated.•The activity of 3D-Ti/PbO2 electrode towards phenol oxidation was investigated.•3D-Ti/PbO2 electrode shows superior electrocatalytic activity.