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The Synthesis and Performance Study of Nickel Oxide Nanomaterials

Author: XiaoJunJia
Tutor: ChenBiaoHua
School: Beijing University of Chemical Technology
Course: Chemical Engineering and Technology
Keywords: Nickel oxide nanomaterials Surface morphology Catalytic properties Flower-like microspheres
CLC: TB383.1
Type: Master's thesis
Year: 2011
Downloads: 208
Quote: 1
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Abstract


NiO nanoparticles have unique properties in terms of electrical, magnetic, and catalytic science, widely used in the field of catalysis, the field of fuel cells, magnetic materials field, and the field of gas sensors, is a promising functional inorganic materials. Nickel oxide nano materials synthesis and morphology of the structure and performance of the relationship between the two main aspects of the nickel oxide nanomaterials research, good preparation performance nickel oxide nano-materials and to clarify the relationship between the morphology and performance extremely important theoretical and practical significance for the further development of the nickel oxide nanomaterials. This paper focuses on the preparation and performance of nano-nickel oxide, developed two glycol system and ethanol - new methods of oil amine system for the preparation of nickel oxide nanomaterials, successfully prepared nano nickel oxide microspheres and nanometer nickel oxide sheet material, and focus on the surface morphology of the material properties. The development of a glycol solvent system synthesis of a new method of preparation of nano-NiO flower-like microspheres. Nickel oxide nanoparticles prepared flower-like microspheres with uniformity of size, dispersion, large specific surface area and multi-aperture distribution characteristics. Regulation can be achieved by changing the concentration and pH value of the raw material on the nickel oxide nanoparticles flower-like morphology and surface structure of the microspheres give the size uniformity of the three types of morphology, the surface structure, specific surface area 59.9 m2 g-1, respectively, 50.2 m2 g-1 and 15.1 m2 g-1 nano-flower-like microspheres. On this basis, the CO oxidation as a model reaction the study focused on the catalytic properties of the surface morphology of the flower-like. Better catalytic activity compared to traditional nano nickel oxide particles, the prepared nano nickel oxide flower-like microspheres, flower-like surface morphology and distribution of its porous characteristics help to improve the catalytic performance; different nano nickel oxide flower-like microspheres and their catalytic performance with the specific surface area increases have improved the trend. Developed on the basis of the above work, based ethanol - oil amine system synthesis of nickel oxide nano hollow microspheres and the chip body new method. The water added can guide a precursor of nickel hydroxide crystalline phase and morphology changes, in order to achieve a flower-like material and the sheet material of the nickel oxide nano controllable preparation. Nanometer hollow microspheres of α-Ni (OH) 2, was obtained as in the case of not adding water to the introduction of a small amount of water in the system, obtained β-Ni (OH) 2 nanosheet. The changes in the soil of this morphology is mainly composed of α-Ni (OH) 2 and β-Ni (OH) 2 on the crystal structure due to the difference. Compared to ethylene glycol systems prepared nickel oxide nano-solid microspheres of the flower-shaped, this method can prepare for the hollow microspheres having a larger specific surface area (100.2m2 / g). Nano-nickel oxide hollow microspheres catalytic CO oxidation better than the nano nickel oxide film body, its flower-like hollow structure has better catalytic activity. Nickel oxide is an important electrode material and its electrochemical properties of the preliminary investigation found that the nano-nickel oxide hollow microspheres have better electrochemical performance than nickel oxide nanosheets.

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