Preparation Of Non-noble Metal Oxides Electrode And Research On Its Properties

Power, material and environment have been attracted much attention as well as development of science and technology, and electrochemistry can applied in lots of field due to its safety and cleanness. Recently, electrochemistry and its production can applied in various field, including lead-acid battery, lithium ion battery, fuel cell, flow battery, electrochemical supercapacitor, electrosynthesis, oxidation of organic compounds in waste water, electrochemical transducer and so on. Electrode plays a key role in the system on which the reaction is took place. It is the most important problem to select and prepare the electrode for the electrochemical process. A study on the preparation of electrode is undertaken, and the factors that influence the mechanism of the preparation, morphology, structure and electrochemical properties of electrode are concluded.The Ti/SnO₂+Sb2O5/PbO₂ electrode with different particle scale is prepared by potentiostatic technology and is characterized by SEM, XPS and XRD. On the base of the date, the mechanism of lead dioxide in the process of anodic deposition is supposed. Ti/PbO₂ doped with F- is electrochemical deposited by potentiostatic technology. F- has much effect on the morphology, structure and electrochemical properties of electrode. F- doping can make the particle get smaller, smooth the surface and inhibit the preferred crystal plane of (200). The depositing potential can change the mass of F- in the electrode which has greater mass when the depositing potential is 1.60 V. the mass of F- in the electrode influences the crystallite size of PbO₂. F- can shrink the crystal. The more the mass of F- contains, the smaller the PbO₂ crystal particle is. F- doping can also have effect on the electrochemical properties of electrode, e.g. inhibiting the oxygen evolution.Fe3+, Co2+ can also influence the properties of electrode. The Ti/PbO₂ doped with Co2+ has more activity than with Fe3+. Ti/PbO₂ is unstable in the anodic process and easy to erode in the acid solution.PbO₂+MnO₂ composite electrode is electrochemical co-deposited in the solution containing Pb2+ and Mn2+. The valence and atom ratio of Pb and Mn is detected by the XPS, which show that the atom radio can be hardly influenced by the potential deposited and controlled by the concentration of acetylcholine. The CV shows that the current density of pseudocapacitance is very high.WO₃ films have been prepared onto IrO₂-coated Ti substrate by electro-deposition, and as-deposited and annealed films have been characterized by using Raman spectroscopy, SEM, XRD. It was found that the as-deposited film consists of orthorhombic WO₃?H2O phase, which transforms to to monoclinic phase by annealing at and above 350 oC. Ti/IrO₂/WO₃ annealed at 450 oC shows significant irreversibility, high electrochemical stability, conductivity and the typical characteristic of capacitive behavior. The specific capacitance obtained at a scan rate of 50 mV·s-1is 46 F·g-1.