Study On The Synthesis And Coating Of Nickel Salts

In this thesis, hexahedronal and flower-like Ni3(PO4)2·8H2O as well as one- dimensional Ni(SO₄)_0.3(OH)_1.4 nanobelt were prepared via a simple template-free hydrothermal route. Moreover, core-shell nanobelt of Ni(SO₄)_0.3(OH)_1.4/C and Ni(SO₄)_0.3(OH)_1.4/Ru(OH)3 were synthesized by hydrothermal carbonization and coprecipitation method, respectively. X-ray diffraction (XRD), X-ray photoelectron spectra (XPS), scanning electron microscope (SEM) and transmission electron microscopy (TEM) were adopted to characterize the crystalline phase and the morphology of the as-obtained products. The main contents were as follows:(1) A series of nickel phosphate (Ni3(PO4)2·8H2O) three-dimensional (3D) hexahedronal and flower-like architectures were synthesized via simple template-free hydrothermal route using NiSO4, K3PO4 and KOH as raw materials. Morphology modification can be conveniently realized by varying the concentration of PO43- ion as well as the reaction time and temperature. The as-prepared flower-like architectures are consisted of numerous radially oriented 3D hexahedron-like petals, such as willow-leaf, parallelogram, rectangle, and rhombus-like, respectively, with a thickness of 0.7-2μm, width of 5-15μm and length of 10-30μm. Meanwhile, a possible mechanism for the transformation of morphology from hexahedron to flower was preliminarily proposed.(2) One-dimensional Ni(SO₄)_0.3(OH)_1.4 nanobelt were prepared via a simple hydrothermal process using NiSO4·5H2O and CH3COONa·H2O as raw materials. The results showed that the molar ratio of NiSO4 to CH3COONa·3H2O had significant influence on the morphology and structure of the as-prepared products.(3) Core-shell nanobelt of Ni(SO₄)_0.3(OH)_1.4/C and Ni(SO₄)_0.3(OH)_1.4/Ru(OH)₃ were synthesized by hydrothermal carbonization and coprecipitation method using the as-prepared Ni(SO₄)_0.3(OH)_1.4 nanobelt as precursor. The thickness of carbon shell can be adjusted by controlling the ratio of Ni(SO₄)_0.3(OH)_1.4 to C6H12O6. XRD, XPS, and TEM were adopted to characterize the crystalline phase and morphology of the as-obtained products.