Studies Of The In Situ Fabrication Of Si-C And C-C Nanohybrids By Catalytic Cracking Polypropylene

Carbon nanomaterials play an important role in the field of nanomaterials, thus designing and fabricating novel carbon-based nanohybrids have always been a hot point in scientific research. In present work, we propose to synthesize two novel carbon-based nanohybrids, namely Si-C nanohybrids and C-C nanohybrids.This method of synthesis Si-C nanohybrid materials by pyrolyzing polypropylene/Ni-Mo-Mg/silicone mixture is used in this article. The products were characterized by Fourier transform infrared spectroscopy (FT-IR), scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray photoelectron microscopy (XPS), thermal gravimetric analysis (TGA) and LAND detector respectively. The microstructure and electrochemical properties of Si-C nanohybrid material had analyzed. A probable formation mechanism of the hybrid material had proposed. Studies have shown that: when the content of methyl MQ silicone resin was 12 wt%, the carbon nanotubes can grow on the nano-or micro-sized silicon flakes. In the LAND test, after 50 cycles,12% Si-C nanohybrid material discharge capacitor still surpassed 1185mAhg-1 and the coulomb efficiency became 98.8%. Due to its good cycle performance, it can be designed as lithium battery electrode material. The formation mechanism of the material is that the silicone of the mixture will migrate to the outer surface and polymerize to form a silicone resin flake at the high temperature catalytic cracking condition. The flake provide a good substrate for the growth of carbon nanotubes. So under the catalytic condition, the Si-C synthesized nanohybrid composites was synthesized on the surface of the silicon layer by the self-assembly method.C-C nanohybrid composite was also synthesized by pyrolyzing polypropylene/Ni-Mo-Mg/rice husk mixture in this article. The obtained product was detected by X-ray diffraction (XRD), high resolution transmission electron microscopy (HRTEM), field emission scanning electron microscope (FE-SEM), Raman spectroscopy (Raman) and thermal gravimetric analysis tester (TGA). The microstructure and thermal stability of the obtained composite were characterized. And the mechanism of using rice husk biomass material to synthesize C-C nanohybrid composite was proposed. The results show that: when the mixture was added 30 wt% of the rice husk, the best result of C-C nanohybrid material is obtained. The defective amorphous carbon formed from rice husk at a high temperature served as a good matrix for the carbon nanofibers growth. This simple and efficient method for preparing C-C nanohybrid material can be widely applied.