Hydrothermal Synthsis And Properties Research Of In₂O₃ Hierarchical Structure

With the development of large-scale industrial process,environmental and energy issues have become a hot issue in today's society. Therefore, how to solve the above problems effectively becomes the future focus of researchers. Among which, the technology of semiconductor-based photocatalytic, compared to conventional physical separation methods, has the advantages of simple process, break down pollutants thoroughly and no secondary pollution,etc., is becoming an effective way to tackle environmental problems. Besides,the anode material of commercial lithium ion battery,is mainly the kind of graphite-like, holds lower theoretical capacity and the safety performance is not high,has restricted the promotion of its large-scale commercialization severely in the field of portable electronics and electric vehicles and other areas.However,Nano-sized semiconductor oxides,have the characteristics of high theoretical capacity, good cycle performance and high safety performance, are an ideal battery cathode materials and have the potential applications in solving the energy problem.For the above reasons, in this paper, In₂O₃, an important n-type metal oxide semiconductor,was selected as research subject. Different phases and morphologies of In₂O₃ hierarchical structure were prepared successfully by hydrothermal method. The photocatalytic activity and electrochemical performance of lithium ion battery were studied. The main contents could be summarized as follows:?1? Hollow spheres with a large surface to volume ratios could improve the performance of the material. Porous In₂O₃ hollow spheres composed of large quantity nanocrystals were synthesized by one-step hydrothermal template method. Different morphologies of the product could be obtained by varying the amount of sucrose and DMF respectively, the formation mechanism of hollow spheres were also discussed.Photocatalytic activity of the samples was tested through degrading RhB solution under UV irradiation. Besides,the electrochemical performance of lithium-ion battery was also studied,the test results revealed that it exhibited good electrochemical properties. The consequences indicated that the preparation of hollow spheres was benefit to improve the performance of the material.?2? Doping is an effective method to enhance the material properties. Zn as doping elements,Zn-doped In₂O₃ microsphere was synthesized successfully using hydrothermal method. Photocatalytic activity of degrading RhB solution showed that it exhibited excellent photocatalytic activity and stability, the relationships between photocatalytic activity and calcination temperature and the doping amount were also discussed.Moreover,the degradation efficiency of MB and MO solution were studied in order to investigate the selection to various pollutants,it was found that the samples also showed outstanding photocatalytic activity and stability to these two pollutants. Besides, the electrochemical performance of lithium-ion battery was also studied,the results revealed that it exhibited superior electrochemical properties. The consequences indicated that Zn doping improved significantly the activity of the photocatalyst and electrochemical performance of lithium batteries.?3? Compared to C-In₂O₃ nanoparticles,H-In₂O₃ nanoparticles displayed enhanced properties sometimes,H-In₂O₃ microsphere was developed successfully in the condition of Na3 cit as structure-directing agent. Photocatalytic activity of degrading RhB and MB solution declared that it exhibited excellent photocatalytic activity and stability to both pollutants. Furthermore,the electrochemical performance of lithium-ion battery was also studied, the results revealed that it exhibited superior electrochemical properties. The consequences indicated that H-In₂O₃ nanoparticles improved significantly the activity of the photocatalyst and electrochemical performance of lithium batteries.?4? In order to overcome the shortcomings of template method,In₂O₃ hierarchical structure was synthesized successfully using the template free method in the condition of PEG-2000 as structure-directing agent. Photocatalytic activity of degrading RhB solution showed that it held excellent photocatalytic activity.