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以油酸和癸酸作为表面活性剂调控Fe_3O_4纳米晶的生长过程制备了由不同比例{100}与{111}面构成的Fe_3O_4纳米晶。利用X射线衍射(XRD),场发射扫描电子显微镜(FESEM)等分析方法对Fe_3O_4纳米晶进行了物相测定和微结构观察,并分析了Fe_3O_4纳米晶的生长机制。在高电流密度(1A/g)条件下,八面体形貌Fe_3O_4纳米晶作为锂电池负极材料表现出比立方八面体和立方形貌Fe_3O_4纳米晶更加优异的电化学性能。实验结果证明Fe_3O_4多面体的表面结构显著影响Fe_3O_4活性材料在电化学循环过程中的电化学反应活性。
The growth process of Fe 3 O 4 nanocrystals was controlled by using oleic acid and capric acid as surfactants to prepare Fe 3 O 4 nanocrystals with {100} and {111} planes. The phase and microstructure of Fe_3O_4 nanocrystals were observed by X-ray diffraction (XRD) and field emission scanning electron microscopy (FESEM). The growth mechanism of Fe_3O_4 nanocrystals was also analyzed. At high current density (1A / g), octahedral morphology of Fe_3O_4 nanocrystals exhibit better electrochemical performance than that of cubic octahedral and cubic morphology Fe_3O_4 nanocrystals. The experimental results show that the surface structure of Fe_3O_4 polyhedrons significantly influences the electrochemical reactivity of Fe_3O_4 during electrochemical cycling.