Quick fabrication of evenly porous PbO2 through potential linear increase electrodeposition

Abstract

Anodic oxidation electrodeposition is the primary way to prepare lead dioxide anode. The regulation of the external circuit for the reaction is a unique advantage of electrocatalytic reaction, which can regulate crystallization and accelerate the reaction process. In this study, lead dioxide coatings with uniform pore size distribution were quickly prepared on three different substrates by potential linear increase electrodeposition (PLIED). Morphology and structure analysis shows that the prepared electrodes have uniform porous morphology, and Ti/SnO2/PLIED has the smallest grain size. Three electrodes all display well degradation performance to azophloxine and diclofenac sodium. Ti/PLIED, and Ti/SnO2/PLIED are appreciated for degrading organics with a simple structure in low concentrations. At the same time, Ti/SnO2/PLIED is more suitable for complex organics in high concentrations. Electrochemical activity tests indicate the different mechanisms of the PLIED electrodes that build the other degradation performance. Three PLIED electrodes show excellent electrical and electrochemical stability during the cycle degradation process. The results provide a reference for the subsequent anodic oxidation electrodeposition research and the regulating effect of the external circuit on coating properties.