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Synthsis and Property Study of Fe-Based Oxides and Fe-Based Oxides/GNS Nanocomposites

Author: ZouQiong
Tutor: LiuPing
School: Shanghai Jiaotong University
Course: Chemistry
Keywords: Fe2O3 Fe2O3/GNS Fe3O4/GNS Hydrothermal method Flower-like Hollow structure Ultrasonic method Nanoparticles
CLC: TB33
Type: Master's thesis
Year: 2011
Downloads: 464
Quote: 0
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Abstract


The iron-based materials because of the rich source of raw materials, environmental pollution, security, better performance electrochemical excellent performance to get the attention of the researchers. Fe 2 O 3 and iron-based oxide / graphene composites have superior optical, electrical and magnetic properties, electromagnetic shielding materials, magnetic materials, catalytic materials, antibacterial materials have broad application prospects. Therefore research controlled synthesis of Fe 2 O 3 and iron-based oxide / graphene composites, to explore the nature of their size dependent properties of the morphology of the iron-based oxide materials, the development of iron based oxide composites new fields of application, become hotspots direction of one of the Materials Research. In addition, the lithium-ion battery has a voltage high, larger than the energy advantages, the most competitive battery. While the the currently industrialized lithium ion battery electrode materials, cathode mainly LiCoO 2 and of LiMn 2 O 4 negative carbon (graphite) materials. The anode material is easy to form SEI passivation film, so that the initial irreversible capacity increases, and the potential is close to the lithium battery overcharge easily the deposition of the metal lithium dendrites and cause a short circuit; find and develop cheap and environment-friendly performance excellent positive and negative materials become the new direction of the lithium-ion battery. In this paper, we synthesized by hydrothermal method and ultrasonic method a series of Fe 2 O 3 and iron-based oxide / graphene composites to study the reaction temperature , reaction time, proportion of raw materials and other conditions on the morphology and structure, and the mechanism of its formation, magnetic properties and electrochemical properties were discussed. The main work include the following aspects: (1) by using a lower temperature step by hydrothermal method, the small molecules complexing agent citric acid trisodium role, not only to obtain a particle size of about 100 nm around the α-Fe < sub> 2 O 3 spherical particles, and also obtained by adjusting the proportion of raw materials, the reaction temperature and reaction time, flower-shaped iron-based oxide. In this preparation process, the tri-sodium citrate, both as a reducing agent, while the limit of the citrate chelation, making Fe 3 O 4 , grown into a sheet, and ultimately the iron-based oxide microspheres presented the flower-like structure. Further research on the basis of the above work, PVP, F127 on Fe 2 O 3 Morphology of different morphologies were prepared porous Fe 2 O 3 . Played a guiding role of iron-based oxide composites as lithium-ion battery anode material. (2) by Hydrothermal Method the hollow Fe 2 O 3 / GNS nanocomposites electrochemical lithium storage performance materials characterization, the results show that hollow Fe 2 O 3 / GNS nanocomposites as a lithium-ion battery anode material with high specific capacity and cycle stability. The hollow Fe 2 O 3 / GNS nano composites simple, readily available raw materials and the reaction solvent is water, it also makes sense from the economic and environmental point of view . (3) In order to prepare a graphene agglomeration lower oxides of iron-based composite material in a more uniformly dispersed therein under ambient conditions using the ultrasonic method successfully prepared Fe 3 O 4 / GNS nanocomposites. The ratio of reactants for product formation, and test Fe 3 O 4 / GNS nano-composite material at different current densities electrochemical properties. Results, Fe 3 O 4 / GNS nanocomposites show the equipment out Fe of than the hydrothermal method 2 O 3 <. / sub> / GNS nanocomposites better electrochemical lithium storage performance and good cycling stability.

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