自组装花状α-Ni(OH)_2和NiO的制备和表征

Synthesis and characterization of α-Ni(OH)_2 and NiO with flowerlike hierarchical architectures

以硝酸镍为原料,尿素为沉淀剂,在不添加任何模板和表面活性剂条件下,采用均匀沉淀法制备出具有自组装结构的花状α型Ni(OH)2,并以其为前驱体,制得了同样具有花状结构的NiO。采用XRD、SEM、HRTEM、TG和低温液氮吸附技术对样品的晶相结构、表面形貌和孔径结构等进行表征。测试结果显示,所制备的样品是α型Ni(OH)2,比表面积是245.0m2/g,而且这些直径为4～6μm的花状Ni(OH)2是由许多纳米薄片相互组装而成。将花状Ni(OH)2在400℃焙烧2h即可获得具有花状结构的NiO,其比表面积为125.2m2/g。

α-nickel hydroxide（Ni（OH）2） with flowerlike hierarchical architectures was successfully synthesized,using urea and Ni（NO3）2 as the starting materials.The prepared products were characterized by X-ray powder diffraction（XRD）,high-resolution transmission electron microscopy（HRTEM）,thermogravimetric analysis（TG） and N2 adsorption-desorption.According the results,the prepared Ni（OH）2 was typical α-phase with specific surface area of 245.0m2/g and showed flowerlike structure with 4-6μm in diameter.Flowerlike nickel oxide（NiO） with the similar flowerlike and the specific surface area of NiO was 125.2m2/g.