Preparation Of Nanocomposites Based On TiO₂ Nanotube Arrays And Its Application In The Study On Application Of Supercapacitor

TiO2 nanotube arrays (TiNTs) have many advantages such as large surface area, good chemical stability, outstanding adsorption and spatial capacity etc. With their good prospects in areas such as solar cells, gas sensors, biological sensors, photochemical water splitting and photocatalysis, TiNTs have attracted lots of interest.Supercapacitors are new energy storage devices which are widely used in electronic information industry, electric vehicles, aerospace and many other fields because of their important features such as high power density, long cycle life, and environmental friendliness. Bridging batteries and conventional capacitors, supercapacitors have good application prospects and commercialpotentials.Based on the above two points, this paper first studied how to prepare carbon functionized TiNTs (G-TiNTs). Then (By combinating ruthenium oxide (RuO2) and G-TiNTs, the G-TiNTs/RuO2 nanocomposites were fabricated. Finally, G-TiNTs/RuO2 nanocomposites were applied in the study of supercapacitor as electrode materials. Main contents of this thesis are as follows:The concept, classification, research achievements, development trends and application prospects of nanomaterials and supercapacitor are reviewed in the first part of the thesis. This part describes the preparation and modification approach for TiNTs, the application of nanomaterials and metal oxide, especially ruthenium oxide (RuO2) in the study of supercapacitorThe second part specifically describes the preparation and modification of electrode materials for supercapacitor. The TiNTs were prepared by anodic oxidation method, and the as-prepared TiNTs is amorphous, and the crystalline was translated into anatase type by annealed at high temperature.. Meanwhile, the residual organic electrolytes were decomposed and changed into carbon when the thermal treatment was carried out under inert gas. Thus, TiNTs nanotube arrays were transferred into anatase crystalline and modified with a layer of graphitized carbon (G-TiNTs) via one-step pyrolysis method. In order to improve the efficiency of the adsorption of Ru3+, G-TiNTs were treated in H2O2. Finally, the G-TiNTs/RuO2 nanocomposite materials for supercapacitor were obtained by a combination of coprecipitation method and subsequent dehydration at a high temperature.G-TiNTs/RuO2 electrode materials were characterized by SEM, TEM, EDS, XRD and XPS. The results show that the RuO2 has successfully attached within the G-TiNTs wall of nano tube, the content the RuO2 is about 3.75%. The electrochemical properties of G-TiNTs/RuO2 were studied by methods such as cyclic voltammograms, constant current charge-discharge approach. Compared to TiNTs and G-TiNTs, the as-prepared G-TiNTs/RuO2 samples have excellent capacitance performance due to the formed carbon layer and the loaded RuO2. The specific capacitance of the G-TiNTs/RuO2 samples was 189.1 F/cm3. And after 1000 charge-discharge cycles, the specific capacitance still maintained at 95.6% of the maximum value, which demonstrated that the sample had good cycle life and stability. In conclusion, the G-TiNTs/RuO2 nanocomposites can be used as electrode materials for supercapacitor due to their good capacitor behavior.