Electrosynthesis and physicochemical properties of α-PbO2-CeO2-TiO2 composite electrodes

In order to investigate the effect of solid particles dopants on physicochemical properties of alpha-PbO2 electrodes, alpha-PbO2 composite electrodes doped with nano-TiO2 and nano-CeO(2)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 alpha-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 alpha-PbO2 unit cell and improve specific surface area. The diffraction peak intensity of alpha-PbO2-CeO2-TiO2 composite electrode is lower than that of pure alpha-PbO2 electrode. The electrocatalytic activity of alpha-PbO2-2.12%CeO2-3.71%TiO2 composite electrode is the best. The Guglielmi model for CeO2 and TiO2 codeposition with alpha-PbO2 is also proposed.