钴基气凝胶的制备及微观结构研究

Synthesis and Characterization of cobalt-based aerogel Aerogel

摘要:

以氯化钴为前驱体,聚丙烯酸（PAA）为模板剂制得了钴基复合气凝胶,通过场发射扫描电镜（FESEM）、高分辨透射电镜（HRTEM）、X射线衍射（XRD）、N2吸脱附以及红外谱图（FTIR）分析对气凝胶的结构进行了表征，结果表明：钴基复合气凝胶是由大量纳米级的球状颗粒堆积而成的，具有典型的三维网络结构，其骨架是由大量非晶态的碳层包覆的氧化钴胶体颗粒所组成的；气凝胶具有较高的比表面积为177m2/g，孔径分布主要集中在4nm左右，为介孔材料。通过退火处理后，钴基复合气凝胶中的有机物被完全氧化、分解，制备出了Co3O4气凝胶，其微观结构较为致密，具有立方的多晶结构，比表面积为54m2/g，孔径分布主要集中在7nm左右。

Abstract:

Cobalt-based composite aerogel was synthesized by sol-gel process and CO2 supercritical drying. The morphology of aerogel was evaluated by field-emmision scanning electron microscope (FESEM) and high-resolution transmission electron microscopy (HRTEM), which suggest that the aerogel was made up of 3-D networks and the skeletal was composed of cobalt oxide colloidal particles with amorphous carbon. The N2 adsorption/desorption shows that the aerogel has high BET surface area of 177 m?g, average pore diameter about 4nm, which means the aerogel possesses the typical characteristic of mesopore. Then cobalt-based composite aerogel was annealed, and the crystal structure of Co3O4 aerogel was investigated by the XRD patterns, The N2 adsorption/desorption showed the aerogel with surface area about 54m2/g and the distribution of pore-diameter around 7nm.