Ferric Oxide And The Synthesis And Application Research Of The Complex

Owing to unique physical and chemical properties, Ferric oxide nanostructured materials have wide applications in photocatalysis, lithium-ion batteries and supercapacitors, etc. In this dissertation, using Fe3+as iron resource synthesis Ferric oxide nanoparticles, using it as templates, prepared Ferric oxide nanocomposites, using those nanomaterials in electrochemical and organic catalysis.1. Preparation and application of alpha-Fe2O3nanoparticlesA simple hydrothermal process for fabrication of hematite (α-Fe2O3) nanoparticles with narrow distribution was developed by using FeCl3as the iron resource, NaAc as the precipitation agent and polyvinylpyrrolidone (PVP) as surfactant. The morphologies and sizes of Ferric oxide can be controlled by changing the concentration of the precursor, surfactant and precipitant agent. The products are characterized by transmission electron microscopy (TEM), scanning electron microscopy (SEM), powder X-ray diffraction (XRD), high-resolution transmission electron microscopy (HRTEM) and X-ray energy spectrum (XPS), etc. It is found that the architecture of Ferric oxide is drastically influenced by the concentration of precipitation agent, the reaction temperature and reaction time. We also obtained the intermediate FeOOH nanorods. Finally, the catalytic performance of the obtained hematite particles were studied which using tert-Butyl hydrogen peroxide (TBHP) as oxidant oxidative cyclohexene and styrene into cyclohexenone and benzaldehyde. The result revealed that hematite nanoparticles have a good catalytic performance with high conversion and selectivity.2. Preparation and electrochemical characteristics of Fe2O3@C nanocomposites with core-shell structure.Fe2O3@C nanocomposites with core-shell structure were synthesized via two-step hydrothermal process using glucose as carbon source. The electrochemical performance of Alpha-Fe2O3, Fe2O3@C and FeOOH is investigated using cyclic voltammetry (CV), galvanostatic charge-discharge measurement, and electrochemical impedance spectroscopy by a three-electrode system. The results show that as-prepared nanomaterials are all typical pseudo-capacitance capacitors. In the process of charge-discharge process occurred oxidation-reduction reaction. In addition, it shows good cycle stability after500cycles. So, it demonstrates that the as-prepared nanomatericals can serve as excellent electrode materials for supercapacitors.3. Synthesis of HC/Pd catalyzer with Fe2O3as template and the applications in catalyzing coupling reaction Firstly, using Fe2O3as templates fabricated hollow carbon nanomatericals (HC), and then the HC supported Pd nanoparticles (HC/Pd) were prepared by precipitation-reduction method. The morphology of catalyst was studied with powder X-ray diffraction (XRD), transmission electron microscopy (TEM), and X-ray energy spectrum (XPS), etc. The catalytic performance of HC/Pd was investigated for carbon-carbon coupling reactions, including Suzuki and Heck reactions. The results demonstrated that the as-prepared HC/Pd nanocomposites exhibit catalytic activity for the two types of coupling reactions under legend free conditions. Especially, Suzuki reactions between various aryl halides and phenylboronic acid gave excellent yields in water. Moreover, the catalytic efficiency has no obvious loss even after6repeated cycles.