钛、铬氧化物纳米结构的水热合成及性能研究
发布时间：2019-01-14 09:11
【摘要】：金属氧化物纳米材料以其特有的物理化学性质,在催化剂、气敏材料、生物医学材料和锂离子电池等领域有着广泛的应用前景。金属氧化物纳米材料的结构和形貌对其性能具有十分重要的影响。因此,采用切实可行的合成方法,通过深入探索其生长机理,对于系统的研究纳米结构与性能的关系,最终实现工业化生产具有非常重要的意义。本文设计了一系列合成Ti O2、Ba Ti O3、Cr2O3及其石墨烯复合材料的新方法,并简单的讨论了部分材料的反应机理,重点检测了它们的锂离子电池性能。通过大量的调研和实验,取得了一些有意义的成果。1.在N,N-二甲基甲酰胺和三氟乙酸的协助下,利用水热法一步合成出纳米Ti O2空心球,并对其进行了各种表征。探索了水热反应时间对纳米Ti O2空心球的结构和形貌的影响,并利用Cr(NO3)3?9H2O成功合成了Cr掺杂的Ti O2核壳结构材料,最后研究了纳米Ti O2空心球及Cr掺杂的Ti O2核壳结构材料的锂离子电池性能。2.利用水热体系,在PEG-200和氨水的协助下,连续、有效地合成出Ba Ti O3纳米晶体,并对其进行了结构和形貌的表征。实验中探索了不同的钛源、矿化剂、水热时间以及循环次数对产物结构和形貌的影响,最后提出了一种可实现工业化大量生产纳米Ba Ti O3的绿色合成方法。3.在草酸和PEG-400辅助下,采用溶剂热法成功地合成出纳米Cr2O3空心球。在溶剂热体系中,我们认为PEG-400可能对晶体的生长有着一定的导向作用,并利用各种表征手段研究了前驱体在空气与氮气中的煅烧产物的结构、形貌、元素分布、热性能以及拉曼光谱分析,提出了其可能的生长机理。最后,采用改进的Hummers方法制备了氧化石墨烯,进而合成了石墨烯包覆的纳米Cr2O3空心球并研究了其锂离子电池性能。
[Abstract]:Metal oxide nanomaterials have been widely used in many fields such as catalysts, gas sensing materials, biomedical materials and lithium-ion batteries due to their unique physical and chemical properties. The structure and morphology of metal oxide nanomaterials have a very important effect on their properties. Therefore, it is of great significance for the systematic study of the relationship between nanostructures and properties and the realization of industrial production by using feasible synthesis methods and by further exploring the growth mechanism of the nanostructures. In this paper, a series of new methods for synthesizing Ti O 2 Ba Ti O 3 Cr 2O 3 and its graphene composites are designed. The reaction mechanism of some materials is briefly discussed, and their lithium-ion battery properties are emphatically examined. Through a large number of investigations and experiments, some meaningful results have been achieved. 1. Nanocrystalline Ti _ 2 hollow spheres were synthesized by hydrothermal method with the assistance of N-dimethylformamide and trifluoroacetic acid. The effect of hydrothermal reaction time on the structure and morphology of nanocrystalline Ti O2 hollow spheres was investigated. Cr doped Ti O2 core-shell materials were successfully synthesized by Cr (NO3) 3?9H2O. Finally, the performance of Ti O 2 hollow spheres and Ti O 2 core-shell materials doped with Cr were investigated. 2. Ba Ti O3 nanocrystals were synthesized by hydrothermal system with the assistance of PEG-200 and ammonia. The structure and morphology of the nanocrystals were characterized. The effects of different titanium sources, mineralizers, hydrothermal time and cycle times on the structure and morphology of the products were explored. Finally, a green synthesis method for the industrial production of nanometer Ba Ti O3 was proposed. Nanocrystalline Cr2O3 hollow spheres were successfully synthesized by solvothermal method assisted by oxalic acid and PEG-400. In the solvothermal system, we think that PEG-400 may have a certain guiding effect on crystal growth. The structure, morphology and element distribution of calcined products of precursor in air and nitrogen have been studied by various means of characterization. The thermal properties and Raman spectra were analyzed, and the possible growth mechanism was proposed. Finally, graphene oxide was prepared by modified Hummers method, and then the graphene coated nanocrystalline Cr2O3 hollow spheres were synthesized and the performance of lithium-ion batteries was studied.
【学位授予单位】：西南科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TB383.1
本文编号：2408551
[Abstract]:Metal oxide nanomaterials have been widely used in many fields such as catalysts, gas sensing materials, biomedical materials and lithium-ion batteries due to their unique physical and chemical properties. The structure and morphology of metal oxide nanomaterials have a very important effect on their properties. Therefore, it is of great significance for the systematic study of the relationship between nanostructures and properties and the realization of industrial production by using feasible synthesis methods and by further exploring the growth mechanism of the nanostructures. In this paper, a series of new methods for synthesizing Ti O 2 Ba Ti O 3 Cr 2O 3 and its graphene composites are designed. The reaction mechanism of some materials is briefly discussed, and their lithium-ion battery properties are emphatically examined. Through a large number of investigations and experiments, some meaningful results have been achieved. 1. Nanocrystalline Ti _ 2 hollow spheres were synthesized by hydrothermal method with the assistance of N-dimethylformamide and trifluoroacetic acid. The effect of hydrothermal reaction time on the structure and morphology of nanocrystalline Ti O2 hollow spheres was investigated. Cr doped Ti O2 core-shell materials were successfully synthesized by Cr (NO3) 3?9H2O. Finally, the performance of Ti O 2 hollow spheres and Ti O 2 core-shell materials doped with Cr were investigated. 2. Ba Ti O3 nanocrystals were synthesized by hydrothermal system with the assistance of PEG-200 and ammonia. The structure and morphology of the nanocrystals were characterized. The effects of different titanium sources, mineralizers, hydrothermal time and cycle times on the structure and morphology of the products were explored. Finally, a green synthesis method for the industrial production of nanometer Ba Ti O3 was proposed. Nanocrystalline Cr2O3 hollow spheres were successfully synthesized by solvothermal method assisted by oxalic acid and PEG-400. In the solvothermal system, we think that PEG-400 may have a certain guiding effect on crystal growth. The structure, morphology and element distribution of calcined products of precursor in air and nitrogen have been studied by various means of characterization. The thermal properties and Raman spectra were analyzed, and the possible growth mechanism was proposed. Finally, graphene oxide was prepared by modified Hummers method, and then the graphene coated nanocrystalline Cr2O3 hollow spheres were synthesized and the performance of lithium-ion batteries was studied.
【学位授予单位】：西南科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TB383.1
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