The Synthesis And Performance Study Of Nickel Oxide Nanomaterials

Nano oxidation nickel is a kind of very promising functional inorganic materials, widely used in catalysis,fuel battery domin,magnetic materials and gas sensors because of its unique properties in electrical,magnetic and catalytic chemistry aspects. To preparation nickel oxide nanomaterials having the good performance and to make clear the relationship between the morphology structure and properties having the important theory and practical significance to the further development of the nickel oxide nanomaterials. In this paper we developed two new methods of preparation nickel oxide nanomaterials, obtained nano oxidation nickel microspheres and nanosheets in glycol system and ethanol-oil amine system, and emphasized investigate the surface morphology on the materials properties.This experimental work developed a new method to synthesis flower-like nanometer oxidation nickel microspheres,which have the features of uniform size,good dispersion,high specific surface area and much pore size distribution, in glycol solvent system. Emphasized the regulation of the surface morphology, and the influence on the performance of the surface morphology. Three kinds of oxidation nickel flower-like nanospheres with uniform size and different surface morphology can be obtained by chaging the concentration of raw material and the pH of solution. Their special surface area were 59.9m2/g,50.2m2/g and 15.1m2/g, respectively. The result of CO oxidation reaction show that the catalytic activity of flower-like nano oxidation nickel microspheres is better than that of traditional oxidation nickel nanoparticles for its novel morphology structure,high specific surface and much pore size distribution. For different flower-like microspheres, the catalytic activity have the trend to improve with the increase of the specific surface area.Another method to synthesis empty oxidation nickel nanospheres and nanosheets in oil amine system was developed on the basis of above work. We found water plays a very mportant role in this synthetic process. The empty oxidation nickel nanospheres, whose precursor is a-Ni(OH)2, were obtained without adding water, and the oxidation nickel nanosheets, whose precursor isβ-Ni(OH)2, were obtained wlile adding water. Compared withβ-Ni(OH)2 crystal,α-Ni(OH)2 has worse ordered degree,higher lamellar spacing and adsorption more water and organic molecules. Compared with the previous method, the empty nanospheres synthesized in this method has higher specific surface, which could reach 100.2 m2/g. The empty nanospheres have better catalytic properties and electrochemical properties, because them have higher specific surface area than the nanosheets.