形貌控制合成介孔纤维状钴酸镍粉末

发布时间：2018-06-03 06:09

本文选题：钴酸镍 + 纤维状　；参考：《矿冶工程》2017年04期

【摘要】：以可溶性氯化镍、氯化钴和草酸为原料,利用氨为配位剂,通过配位共沉淀-热分解法制备了多孔纤维状钴酸镍(NiCo_2O_4)粉末。采用XRD、SEM、TEM、IR以及BET对前驱体和NiCo_2O_4粉末的物相、成分与形貌进行了表征,系统考察了配位共沉淀条件对前驱体粉末形貌、粒度和成分的影响。采用DTA/TG研究了钴酸镍前驱体粉末的热分解历程。结果表明:Ni~(2+)-Co~(2+)-NH_3-NH_4~+-C_2O_4~(2-)-H_2O反应体系中,在溶液pH=8.0、温度50℃、金属离子浓度0.5 mol/L的条件下可得到纤维状钴酸镍前驱体粉末;氨与镍钴离子配合生成含氨草酸镍钴复盐是纤维状形貌形成的机理。在空气气氛中300℃热分解该前驱体粉末即可得到比表面积97 m~2/g、平均孔径11 nm、轴径比30~50的纤维状多孔NiCo_2O_4粉末。
[Abstract]:The porous nickel cobalt nickel (NiCo_2O_4) powder was prepared by the coordination co precipitation thermal decomposition method with soluble nickel chloride, cobalt chloride and oxalic acid as a coordination agent. The phase, composition and morphology of precursors and NiCo_2O_4 powders were characterized by XRD, SEM, TEM, IR and BET. The conditions of coordination and coprecipitation were systematically investigated. The thermal decomposition process of nickel cobalt precursor powder was studied by DTA/TG. The results showed that in the Ni~ (2+) -Co~ (2+) -NH_3-NH_4~+-C_2O_4~ (2-) -H_2O reaction system, fibrous nickel cobalt precursor powder could be obtained at the solution pH=8.0, temperature 50, and metal ion concentration of 0.5 mol/L; The complex salt of nickel and cobalt ions with nickel and cobalt ions is the mechanism of the formation of fibrous morphology. In the air atmosphere, the specific surface area of the precursor powder is 97 m~2/g, the average pore diameter is 11 nm, and the fiber like porous NiCo_2O_4 powder with the axial diameter ratio 30~50 can be obtained at 300.
【作者单位】：中南大学冶金与环境学院;
【基金】：国家自然科学基金青年基金(51404306) 湖南省科学技术厅科技计划(2010FJ3012) 佳纳研究基金(JNJJ201613)
【分类号】：TB383.3;TQ138.13

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