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根据同时平衡和质量平衡原理,建立了Ni2+-C2H8N2-2?24C O-H2O体系的沉淀-配合平衡热力学模型,并对该模型进行计算来揭示该体系中各物种浓度随pH值、草酸及乙二胺浓度的变化规律。结果表明,当pH<1和pH=1-6时,溶液中的Ni分别主要以游离Ni2+及[Ni(C2O4)n]2-2n形式存在。当pH>6时,Ni2+与乙二胺的配合作用占优势。当用乙二胺作配位剂,采用草酸盐沉淀法制备了Ni微米纤维前驱体,并讨论了乙二胺在前驱体生长机制中的作用。将前驱体在N2和H2混合气氛中热分解还原,可得到直径0.2~1μm、长径比20~30的Ni微米纤维。
According to the principle of simultaneous equilibrium and mass balance, a precipitation-mixing equilibrium thermodynamic model of Ni2 + -C2H8N2-2? 24C O-H2O system was established and the model was calculated to reveal that the concentration of each species in the system varies with pH value, oxalic acid and B Diamine concentration changes. The results show that Ni exists mainly in the form of free Ni2 + and [Ni (C2O4) n] 2-2n when pH <1 and pH = 1-6. When pH> 6, the coordination between Ni2 + and ethylenediamine is dominant. When ethylenediamine was used as complexing agent, Ni precursor was prepared by oxalate precipitation method and the effect of ethylenediamine on precursor growth was discussed. The precursors were thermally decomposed and reduced in a mixed atmosphere of N2 and H2 to obtain Ni micrometer fibers with a diameter of 0.2-1 μm and an aspect ratio of 20-30.