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在相同的物理化学条件、不同晶化时间的条件下,采用化学沉淀法制备球形氢氧化镍晶体并应用SEM技术分别考察制得样品的形貌。研究表明:在相同的物理化学条件下,随着晶化时间的增加,样品的微观形貌由不规则状晶体变为完整的球状晶体。结合XRD表征结果分析得出:(001)晶面在晶化时间达到3 h时生长到了一个稳定的状态,并不随着晶化时间的增加而有明显的变化,但(100)与(101)晶面随晶化时间的增加继续生长,当晶化时间达到12 h时氢氧化镍的相对结晶度最大,(100)与(101)衍射峰强度高且峰形尖锐,说明氢氧化镍晶体的结构规整性增强。本文还讨论了氢氧化镍生长结晶过程中晶面选择性生长对晶体形貌及电化学性能的影响。
Under the same physicochemical conditions and different crystallization time, spherical nickel hydroxide crystals were prepared by chemical precipitation method and the morphologies of the prepared samples were investigated by SEM. The results show that under the same physicochemical conditions, with the increase of crystallization time, the microstructure of samples changes from irregular crystals to complete spherical crystals. The results of XRD characterization show that the (001) crystal plane grows to a stable state when the crystallization time reaches 3 h and does not change obviously with the increase of crystallization time. However, the (100) and (101) The crystal surface continued to grow with the increase of crystallization time. When the crystallization time reached 12 h, the relative crystallinity of nickel hydroxide was the highest. The intensity of (100) and (101) diffraction peaks were high and the peak shapes were sharp. Structural regularity enhanced. The effects of selective growth of crystal planes on the morphology and electrochemical properties of the crystals during the growth and crystallization of nickel hydroxide were also discussed.