关键词: ZrO₂, 铌基二氧化铅, 电催化活性, 甲基橙

Abstract: The zirconium oxide (ZrO₂)-doped niobium based lead oxide (Nb/PbO₂) electrode was prepared by electrodeposition. The microstructures and electrochemical properties of Nb/ZrO₂+PbO₂ electrode were investigated using scanning electron microscopy (SEM), X-ray diffraction (XRD), linear sweep voltammetry, electrochemical impedance spectroscopy and cyclic voltammotry. In addition, the Nb/PbO₂ electrode was used as an anode for the electrochemical degradation of methyl orange (MO). Results revealed that the ZrO₂ doping made the Nb/PbO2 electrode surface denser and rougher with smaller sized crystal particles, which increased the specific surface area and enhanced the electrocatalytic activity of the electrode. The Nb/ZrO₂+PbO₂ electrode was mainly composed of β-PbO₂ with a small amount of α-PbO₂ and ZrO₂ formed by codeposition. Accordingly, the Nb/ZrO₂+PbO₂ electrode possessed higher oxygen-evolution potential, larger adsorption capacity and lower charge-transfer resistance, as well as higher electrocatalytic activity in the degradation of organic materials than the Nb/PbO₂ electrode. The MO degradation processes were irreversible and controlled by diffusion.

Key words: ZrO₂, niobium-base lead dioxide, electro-catalytic activity, methyl orange