Preparation, Microanalysis And Performance Study Of The TiO₂ Nanotube Modified Electrode

In recent years, because of its large specific surface area, strong adsorption ability, strong surface binding energy, strong deoxidizing ability and other excellent features, the titanium dioxide nanotubes?TiO₂ nanotubes, abbreviated as TNTs? has been received widespread attention as the electrode material. In this paper, preparation conditions of TNTs electrode are systematically investigated by means of surface microanalysis technique in the process of anodic oxidation and its growth mechanism are also discussed. On this basis, the graphene modified TiO₂ nanotube electrodes?Gr/TNTs? and gold doped graphene modified TiO₂ nanotube electrodes?Au/Gr/TNTs? are prepared. Besides, its electrochemical properties and catalytic properties are studied. The thesis is divided into four sections:In chapter 1: Introduction. On the basis of the strucure and properties of TNTs, the research status and the application progress of TNTs were mainly reviewed. In this chapter, some problems and difficulties in this field are also discussed. At the same time, its development and application are prospected.In chaper 2: In this chapter, TNTs was prepared by electrochemical oxidation in HF aqueous solution. The effect on the phase composition, microstructure of preparation conditions such as external voltage, oxidation time, electrolyte concentration, pH value, annealing temperature etc. were systemically researched and the grow mechanism were also discussed. The results show that the pH value of electrolyte solution is an important factor to affect TNTs falling off or not. At temperature 30? in mass concentration 0.5% HF aqueous solution the optimal preparation conditions are as follows: pH=5, oxidation voltage is 20 V, oxidation time is 40 minites. According to the above conditions, TNTs thin films with good uniform morphology, highly regular, shedding-proof are prepared.In chapter 3: Using grapheme oxidation as the electrodepositing solution, Graphene modifying TNTs?Gr/TNTs? were prepared by electrodeposition method. With methyl orange simulated dye wastewater, the effect of solution concentration, pH value, electrolyte concentration, cell voltage etc. on TNTs electrodes catalytic degradation efficiency was researched, the electrochemistry and electrocatalytic properties of Gr/TNTs were investigated, and the relation between microstructure and properties was discussed. The research results show that: electrical catalytic degradation of methyl orange solution for 20 min, Gr/TNTs electrode electrode catalytic efficiency is up to 97.29%, which is superior to that of TNTs electrode 39.88%. The performance improvement of Gr/TNTs electrode can be confirmed by cyclic voltammetric curve.In chapter 4: Based on the previous experiments, Au/Gr/TNTs electrode of different Au loading amounts was prepared by ion sputtering method. Besides, its electrochemistry and electrocatalytic performance was also investigated.