Abstract:In order to investigate the effect of solid particles dopants on physicochemical properties of α-PbO₂ electrodes, α-PbO₂ composite electrodes doped with nano-TiO₂ and nano-CeO₂ particles were respectively prepared on Al/conductive coating electrodes in 4 mol/L NaOH solution with addition of PbO until saturation by anodic codeposition. The electrodeposition mechanism, morphology, composition and structure of the composite electrodes were characterized by cyclic voltammogram (CV), SEM, EDAX and XRD. Results show that the doping solid particles can not change reaction mechanism of α-PbO₂ electrode in alkaline or acid plating bath, but can improve deposition rate and reduce oxygen evolution potential. The doping solid particles can inhibit the growth of α-PbO₂ unit cell and improve specific surface area. The diffraction peak intensity of α-PbO₂-CeO₂-TiO₂ composite electrode is lower than that of pure α-PbO₂ electrode. The electrocatalytic activity of α-PbO₂-2.12%CeO₂-3.71%TiO₂ composite electrode is the best. The Guglielmi model for CeO₂ and TiO₂ codeposition with α-PbO₂ is also proposed.

Key words: Al; lead dioxide; composite electrodes; electrocatalysis; physicochemical property