Hydrothermal Synthesis And Performance Of Titanium, Chromium Metal Oxides Nanostructures

Metal oxide nanomaterials have been widely used as catalysis, gas sensitive material, biomedical material and lithium ion battery due to their unique physical and chemical properties. The structure and morphology of metal oxide nanomaterials have very important influence on performance. Therefore, adopting the feasible synthesis method and exploring their growth mechanism should be a key prerequisite to understand the relation between structure and performance of nanomaterials and industrial applications. In this paper, a series of new synthesis methods of nanosized Ti O2, Ba Ti O3, Cr2O3 and Cr2O3/ graphene composite have been developed. Their reaction mechanisms have been explored. Lithium ion battery performances of selected samples have been tested. A lot of research and experiment have made some meaningful results.1. By a hydrothermal method, Ti O2 hollow nanospheres have been successfully synthesized under DMF and TFA assistance. The samples were characterized by X-Ray diffraction, field emission scanning electron microscopy and energy dispersive X-ray spectrom. Ti O2 hollow nanosphere various nanostructures morphologies have been investigated by changing the hydrothermal time, and Cr doped Ti O2 core-shell structure materials have been successfully synthesized by using Cr(NO3)3?9H2O. Finally, Lithium ion battery performances of as-prepared samples have been tested.2. In the hydrothermal system, Ba Ti O3 nanocrystalline have been continuously synthesized under the mineralizer assistance. The products were characterized by X-Ray diffraction, field emissio n scanning electron microscopy and high resolution transmission electron microscopy. Titanium source, mineralizer, hydrothermal time and recycle times have been investigated in present experiment. At last, we proposed a feasible route to synthesize Ba Ti O3 nanocrystalline for industrial applications.3. By a solvothermal method, Cr2O3 hollow nanospheres have been successfully synthesized under oxalic acid and PEG-400 assistance. In the system, we believe that the PEG-400 may play a certain guiding role for the growth of the crystal. The samples were characterized by XRD, FE-SEM, EDX, TGA and Raman, and we proposed a possible formation mechanism according to the results. Graphite oxide was synthesized from natural graphite powders by a modified Hummer’s method, and Graphene-wrapped Cr2O3 hollow nanospheres were prepared by a hydrothermal method. Finally, Lithium ion battery performances of as-prepared samples have been tested.