The Modification Of Lead Dioxide Electrode And Its Electriccatalytic Performance Research

PbO2is concerned the most attractive anode material owing to its low cost, high electrical conductivity, chemical inertness, and high overpotential for the oxygen evolution. In this paper, the rare earth doping and the preparation of nanotubular structure to further improve the electrochemical performance of PbO2electrode main work is as follows:Lead dioxide anodes doped with the praseodymium was prepared by a simple method of cyclic voltammetry (CV) and coelectrodeposition (CD) method. Then the major work focused on the investigation of the different electrochemical performance of lead dioxide anode before and after doping praseodymium and the different electrochemical performance of praseodymium doped lead dioxide anode by CV method and CD method was also compared. Scanning electron microscopes (SEM), X-ray diffraction (XRD) and X-ray photoelectron spectroscopy analysis (XPS) were utilized to characterize the morphology, crystal structure, elemental states of the modified anodes. The electrochemical properties and service life of the modified anodes were characterized by electrochemical techniques such as CV, accelerated life test and electrochemical impedance spectroscopy (EIS). Moreover, the anodic oxidation of methyl orange was examined by bulk electrolysis to characterize the electrocatalytic activity of the Ti/PbO2-Pr2O3(CV) anode. The results suggested that the electrochemical performance of praseodymium doped PbO2anode has a significantly improvement. After doping, the grain size of the modified anodes is smaller and has a longer service life. The average service life of the praseodymium doped PbO2anodes is692h which is3.3times as much as the undoped Ti/PbO2anode. The decolorization rate of methyl orange and COD removal value of the praseodymium doped PbO2anodes is1.4times and1.2times than the undoped Ti/PbO2one. The electrochemical performance of the Ti/PbO2-Pr2O3(CV) is better than the Ti/PbO2-Pr2O3(CD) anode. Comparative studies between the two doped anodes indicated that the Ti/PbO2-Pr2O3(CV) anode had a larger surface, a better stability and exhibited a longer service life. The electrochemical oxidations of methyl orange on the Ti/PbO2-Pr2O3(CV) anode suggested that it has excellent electrocatalytic performances. The current efficiency of Ti/PbO2-Pr2O3(CV) anode was increased by17%and the energy consumption reduced by8%compared to Ti/PbO2-Pr2O3(CD).A novel nanotube structure of Ti/TiO2NT/PbO2anode was successfully fabricated by anodic oxidation and pulse electrodeposition (PED) method. The major work focused on the investigation of the morphology and chemical composition of the Ti/TiO2NT/PbO2anode. And then, the electrochemical performance of anodes was compared before and after the deposition of PbO2. The results of XRD and XPS identified the presence of crystalline structures of β-PbO2and the real atomic percentage of Pb in the surface of Ti/TiO2NT/PbO2anode was11.75%. The representative SEM and TEM images indicated that PbO2successfully electrodeposited around the tubes wall without blocking the tubes. The electrocatalytic performance of Ti/TiO2NT/PbO2anode reached its maximum when electrodeposition time was45min. The deposition of PbO2may lead to the decrease of directed electron transfer resistance. The effects of current density and concentration of Cl’on the Ti/TiO2NT/PbO2anode for degradation of phenol is conducted by the experiment of electrochemical oxidations of phenol. The result suggested that30mA·cm-2was the optimal current condition. The removal efficiency of phenol and COD removal reached to96.6%and88.7%respectively which containing17.53g· L-1NaCl at the current density of30mA·cm-2. In summary, the novel structure increased significantly the electrocatalytic performances of the Ti/TiO2NT/PbO2anode.