A simple sonochemical route has been successfully developed to synthesize SnO2 hollow microspheres. The obtained sample is characterized by XRD, TEM, XPS and UV-visible spectrophotometer. The TEM image of the sample a...A simple sonochemical route has been successfully developed to synthesize SnO2 hollow microspheres. The obtained sample is characterized by XRD, TEM, XPS and UV-visible spectrophotometer. The TEM image of the sample at high magnification shows that the shell of the hollow sphere is composed of 3-5 nm SnO2 nanoparticles. A possible formation mechanism of the hollow spheres is briefly discussed.展开更多
Hierarchical urchin-like gamma-Al2O3 hollow microspheres were prepared by a hydrothermal method followed by a calcination process using Al(NO3)(3)center dot 9H(2)O as aluminum source, NH3 center dot H2O as precipitati...Hierarchical urchin-like gamma-Al2O3 hollow microspheres were prepared by a hydrothermal method followed by a calcination process using Al(NO3)(3)center dot 9H(2)O as aluminum source, NH3 center dot H2O as precipitating agent, and P123 as structure-directing agent (SDA). The obtained samples were investigated using X-ray diffraction (XRD), filed emission scanning electron microscopy (FESEM), transmission electron microscopy (TEM), and N-2 adsorption/desorption. The influences of P123 concentration, acidic condition, and hydrothermal time on the morphology of product were discussed. P123 has a great influence on ruling the oriented attachment of nanowires and stabilizing the superstructure in the self-assembly process. The 3D urchin-like hollow microspheres have a surface area of 210.2 m(2)/g and the average pore size is 11.42 nm, which have widely potential application such as catalyst, adsorption, and separation.展开更多
二氧化钛(TiO_(2))因其储量丰富、环境友好、性能稳定等特点,作为锂离子电池负极被广泛研究。但低的电子电导率阻碍了其实际的应用。本文通过水热法结合热处理工艺制备了磷掺杂的二氧化钛空心微球。其中空心结构提供了大的比表面,同时...二氧化钛(TiO_(2))因其储量丰富、环境友好、性能稳定等特点,作为锂离子电池负极被广泛研究。但低的电子电导率阻碍了其实际的应用。本文通过水热法结合热处理工艺制备了磷掺杂的二氧化钛空心微球。其中空心结构提供了大的比表面,同时磷掺杂产生Ti能协同改善TiO_(2)导电性,因此,制得的空心微球其显示出改善的电化学性能。0.2 C电流密度下首次放电比容量为259.2 m Ah/g,5 C电流密度下循环500圈容量保持率达83%。展开更多
文摘A simple sonochemical route has been successfully developed to synthesize SnO2 hollow microspheres. The obtained sample is characterized by XRD, TEM, XPS and UV-visible spectrophotometer. The TEM image of the sample at high magnification shows that the shell of the hollow sphere is composed of 3-5 nm SnO2 nanoparticles. A possible formation mechanism of the hollow spheres is briefly discussed.
基金This work was financially supported by National Natural Science Foundation of China，State Key Laboratory of Advanced Technology for Materials Synthesis and Processing (Wuhan University of Technology)
文摘Hierarchical urchin-like gamma-Al2O3 hollow microspheres were prepared by a hydrothermal method followed by a calcination process using Al(NO3)(3)center dot 9H(2)O as aluminum source, NH3 center dot H2O as precipitating agent, and P123 as structure-directing agent (SDA). The obtained samples were investigated using X-ray diffraction (XRD), filed emission scanning electron microscopy (FESEM), transmission electron microscopy (TEM), and N-2 adsorption/desorption. The influences of P123 concentration, acidic condition, and hydrothermal time on the morphology of product were discussed. P123 has a great influence on ruling the oriented attachment of nanowires and stabilizing the superstructure in the self-assembly process. The 3D urchin-like hollow microspheres have a surface area of 210.2 m(2)/g and the average pore size is 11.42 nm, which have widely potential application such as catalyst, adsorption, and separation.
文摘二氧化钛(TiO_(2))因其储量丰富、环境友好、性能稳定等特点,作为锂离子电池负极被广泛研究。但低的电子电导率阻碍了其实际的应用。本文通过水热法结合热处理工艺制备了磷掺杂的二氧化钛空心微球。其中空心结构提供了大的比表面,同时磷掺杂产生Ti能协同改善TiO_(2)导电性,因此,制得的空心微球其显示出改善的电化学性能。0.2 C电流密度下首次放电比容量为259.2 m Ah/g,5 C电流密度下循环500圈容量保持率达83%。
