Study on Synthesis of Ni-S Powders Synthesized by Hydrothermal Co-reduction

摘要

The technologies of synthesizing Ni-S powders from 0.001 mol NiCl2·6H2O and 0.001 mol sulfur (S) powder were investigated at 95,105,120,140 and 160 °C.The phases and morphology of the products were characterized by X-ray diffraction (XRD) and transmission electron microscopy (TEM) respectively.Experimental results show that,the Ni-S powders prepared at 120～160 °C from NiCl2·6H2O and S powder have the same major phase NiS.These products have flakes or unregular shape grains with sizes of 100～200nm.However,the product powder prepared at 105 °C has the major phase Ni3S2 without obvious impurity phases and only grains with size less than 200nm.No Nickel sulfides can be synthesized at 95 °C under the experimental conditions.It can be found that the NiS phase appears in the products powders obtained at higher temperatures while Ni3S2 obtained at lower temperature.