The Preparation Of The Novel High Performance Lead Dioxide Electrode And Its Electrooxidation Performance Research

The PbO2electrode has received considerable attention due to its low cost, high oxygen evolution potential, chemical inertness and high electrocatalytic activity for anodic oxidation. However, PbO2active layer may easily flake from the surface of the substrate in the process of use. Thus, the stability, service life and catalytic performance of PbO2electrode is poor. In order to futher improve the electrochemical performance of PbO2electrode, the paper from two aspects of modified surface and change the structure of PbO2electrode modification research. Details are as follows:Different underlayers have been added between the PbO2active layer and the substrate.. TiO2as underlayer is a kind of good physical and chemical stability of n-type semiconductor materials in acid solution. Therefore, people have an increasing interest in TiO2film which can improve the anti-corrosion performance of the substrate. In addition, TiO2has been demonstrated as the most important semiconductor electrode material in the field of electrochemistry. Ce-doped nano-Ti02film was prepared on titanium substrate surface by the sol-gel method and dip-coating method. The structure, morphology and composition of TiO2films were characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD), field X-ray photoelectron spectroscopy (XPS), and then evaluated for their corrosion resistance property by electrochemical impedance spectroscopy (EIS) and Tafel polarization measurements. The SEM and XRD results indicated the TiO2particle size became smaller and surface became more rough after Ce doping. XPS analyses indicated that the existence of Ce, Ti and O elements. The EIS and Taffel polarization measurements results indicated that Ce modified nano-TiO2film had better corrosion resistance.With corrosion resistance performance of nano-TiO2film an middlelayer, preparing a novel electrode of Ti/TiO2/PbO2. It is found that introducing rare earth element (Ce) into the underlayer and active layer can improve corrosion resistance and their surface structure. SEM and XRD results indicated PbO2coating of particle size become smaller, more rough surface and specific surface area increased. XPS analyses indicated that the existence of Ce, Pb and O elements. The CV and EIS results indicated that Ti/Ce-TiO2/Ce-PbO2electrode has largest peak current, highest oxygen evolution potential and smallest charge transfer resistance. The best reaction conditions for electro-catalytic oxidation of methyl orange were determined:current density is50mA·cm-2, and concentration of supporting electrolyte Na2SO4is0.04mol·L-1. The results show that the novel PbO2electrode for decolorization effect of methyl orange are rather good, but Ti/Ce-TiO2/Ce-PbO2electrode had best electro-catalytic property. After degradation of100min, the COD removal rate was92%.A novel structure of Ti/TiO2NTs/PbO2electrode was fabricated by anodic oxidation and pulse electrodeposition (PED) method. SEM results indicated TiO2NTs are highly ordered and tubes are closely linked to each other. The surface become rough after pulse electrodeposition of lead dioxide. It indicated PbO2nanoparticles successfully load to the surface and inside of T1O2nanotubes. The results of XRD and XPS identified the presence of crystalline structures was β-PbO2. CV and EIS results indicated Ti/TiO2NTs/PbO2electrode has larger peak current and smaller charge transfer resistance. The electrochemical oxidations of phenol on the Ti/TiO2NTs/PbO2electrode suggested that it has more excellent electrocatalytic performances than Ti/TiO2NTs electrode. After degradation of180min, the COD removal rate reached to80%. The efficiency of the degradation of phenol has been improved obviously. In a word, the novel structure of Ti/TiO2NTs/PbO2electrode has good electrochemical activity and will become a promising hybrid material in electrocatalysis.