| Following the carbon nanotube and fullerene, graphene is another new nanoscale functional materials with high conductivity, high specific surface area, high thermal conductivity and good mechanical properties, nowadays, and it has important and clear Application prospects in Lithium-ion battery and the field of photocatalytic technology. Therefore, the research objectives of this paper are the preparations of high-performance TiO2(B) anode material for lithium-ion battery and Bi2WO6light catalyst, and we focused on the affects of properties of TiO2(B) anode material for Li-ion batteries and Bi2WO6photocatalysts in combination with graphene sheets. The XRD, SEM, TEM, AFM, BET, TGA and other characterization methods were used for the crystal structure, composition, surface morphology and microstructure research analysis of the prepared materials.First, a high-quality graphene oxide sheets were successfully prepared by the improved Hummers method, and which had few graphite layers (4-5layers), a large surface area and a regular structure. The synthesis of one-dimensional (ID) mesoporous TiO2(B) nanobelts by hydrothermal treatment of commercial TiO2(P25) powders and. functionalized graphene oxide. The hybrid material is constructed from ID mesoporous single-crystalline TiO2(B) nanobelts combined with2D graphene, exhibiting various textural features such as mesoporosity of TiO2(B) nanobelts, homogeneous incorporation of graphene into nanobelts, minimal size and tight-contacting nanoarchitecture. As a anode material for Li-ion battery, the mesoporous structure of TiO2(B) and unique sheet-belt nanoarchitecture could be a synergistic effect occurs:(1) the incorporation of graphene within TiO2(B) nanobelts makes a great contribution to the special capacity and effectively enhances the electrical conductivity of TiO2(B);(2) The ID mesoporous structure of TiO2(B) nanobelts provides large electrolyte-electrode contact area, shortens the Li+ion diffusion length, and better accommodates large volume-strain changes induced by lithium insertion-extraction.(3) A high surface-to-volume ratio of sheet-belt nanostructures can offer more interfacial bonding for extra sites of Li+insertion, ensure fast electron transport and provide good reaction kinetics for insertion-extraction of ions. The special capacity of the G-TiO2(B) hybrid can be held stable at about600mAhg-1, the charge and discharge capacity can be up to335,280, and210mAhg-1at0.5,1, and3Ag-1, and when the rate is decreased from3to0.15Ag-1, the special capacities of the two electrodes can be recovered, implying a good reaction reversibility and structural stability.Additionally, a higher photocatalytic activity Bi2WO6-graphene composite prepared by one step hydrothermal method from GO, Na2WO4, and Bi (NO3)3·5H2O, and studied on the relation between the proportion of graphene in the composite and the photocatalytic properties. Different graphene content have a great impact to the photocatalytic properties of the composite material, graphene content is1%in Bi2WO6-graphene composite, the composite had the best catalytic effect. Under the visible light,300ml concentration of1×10-5molL-1solution of rhodamine B could be basic completely broken up by0.3g of the composite catalyst. The photocatalytic properties of the Bi2WO6-graphene composites is higher than the than pure Bi2WO6may be due to the synergy of the graphene and Bi2WO6. Effectively separate the photo-generated electron-hole pairs to increase the photo-generated electron and hole utilization, and provide more reactive sites, thus significantly improve the photocatalytic properties of the composite. |
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