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首页> 外文期刊>Inorganic Chemistry Frontiers >Controlled synthesis of 3D porous VO2(B) hierarchical spheres with different interiors for energy storage
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Controlled synthesis of 3D porous VO2(B) hierarchical spheres with different interiors for energy storage

机译：具有不同内部的3D多孔VO2（B）分层球的控制合成

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摘要

A strategy for the synthesis of three-dimensional (3D) porous VO2(B) hierarchical spheres with different interiors (solid spheres and hollow spheres) was developed by a template-free method. 3D VO2(B) solid spheres were synthesized by the precipitation of precursor spheres at room temperature and subsequent calcination, while 3D VO2(B) hollow spheres were prepared by the hydrothermal treatment of precursor spheres and subsequent calcination. BET specific surface areas of VO2(B) solid spheres and hollow spheres were measured to be 18 and 29 m(2) g(-1), respectively, and their porosity varied from mesoporous to macroporous with hierarchical structures. Electrochemical properties of 3D porous VO2(B) hierarchical spheres were studied by cyclic voltammetry (CV), galvanostatic charge-discharge (GCD) and electrochemical impedance spectroscopy (EIS). As electrode materials, the specific capacitances of 3D VO2(B) hollow spheres and solid spheres reach as high as 1175 mF cm(-2) (336 F g(-1)) and 951 mF cm(-2) (272 F g(-1)) at 2 mA cm(-2), respectively. After 10000 cycles, the capacitance retention of about 68% and 49% was observed for VO2(B) hollow spheres and solid spheres, respectively. Furthermore, symmetric supercapacitor (SSC) devices using VO2(B) hollow spheres and VO2(B) solid spheres were assembled, and they exhibited good pseudocapacitive properties. VO2(B) hollow sphere-SSC device delivered an areal capacitance of 246 mF cm(-2) at 1 mA cm(-2), while VO2(B) solid sphere-SSC device delivered an areal capacitance of 122 mF cm(-2) at 1 mA cm(-2). VO2(B) hollow spheres exhibit better electrochemical properties, including specific capacitance, areal energy density and cycling stability, compared with those of VO2(B) solid spheres. The findings in this work demonstrate that 3D porous VO2(B) hierarchical spheres with different interiors can improve the electrochemical properties of VO2(B) and can be considered promising candidates for high-performance energy storage materials.
机译：通过无模板方法开发了一种具有不同内部（固体球和空心球）的三维（3D）多孔VO2（B）分层球的合成策略。通过在室温下的前体球沉淀和随后的煅烧来合成3D VO2（B）固体球，而通过前体球的水热处理和随后的煅烧制备3D VO2（B）中空球。测量VO2（b）固体球体和空心球的BET比表面积分别为18和29μm（2 )g（-1），并且它们的孔隙率从介孔与分级结构的大孔变化。通过循环伏安法（CV），电镀电荷 - 放电（GCD）和电化学阻抗光谱（EIS）研究了3D多孔VO2（B）分层球的电化学性质。作为电极材料，3D VO2（B）中空球体的特定电容和固体球的高达1175mF cm（-2）（336°F（-1））和951mF cm（-2）（272 f g （-1）分别为2 mA cm（-2）。在10000次循环之后，对于VO2（B）中空球体和固体球，观察到约68％和49％的电容保持。此外，组装了使用VO2（B）中空球体和VO2（B）固体球的对称超电容器（SSC）器件，并且它们表现出良好的假胶加素特性。 VO2（B）中空球体-SSC器件在1 mA cm（-2）时将246mF cm（-2）的面积电容输送，而VO2（B）固体球体-SSC器件提供122mF cm的面积电容（ - 2）在1 mA cm（-2）。与VO2（B）固体球相比，VO2（B）中空球体表现出更好的电化学性能，包括比电容，面积能密度和循环稳定性。该工作中的发现表明，具有不同内部的3D多孔VO2（B）分层球可以改善VO2（B）的电化学特性，并且可以被认为是高性能储能材料的有希望的候选者。

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  • 来源
    《Inorganic Chemistry Frontiers》 |2018年第11期|共13页
  • 作者

    Zhang Yifu; Jing Xuyang; Cheng Yan; Hu Tao; Meng Changgong;

  • 作者单位

    Dalian Univ Technol Fac Chem Environm &

    Biol Sci &

    Technol Sch Chem Dalian 116024 Peoples R China;

    Dalian Univ Technol Fac Chem Environm &

    Biol Sci &

    Technol Sch Chem Dalian 116024 Peoples R China;

    Dalian Univ Technol Fac Chem Environm &

    Biol Sci &

    Technol Sch Chem Dalian 116024 Peoples R China;

    Dalian Univ Technol Fac Chem Environm &

    Biol Sci &

    Technol Sch Chem Dalian 116024 Peoples R China;

    Dalian Univ Technol Fac Chem Environm &

    Biol Sci &

    Technol Sch Chem Dalian 116024 Peoples R China;

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  • 正文语种 eng
  • 中图分类 无机化学;
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