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Ni (OH)2-碳纳米管-还原氧化石墨烯复合材料的制备及电化学性能

Preparation and electrochemical properties of Ni(OH)2-carbon nanotubes-reduced graphene oxide composites

    摘要
  • 摘要: 利用简单易行的一步水热法制备了Ni（OH）2-碳纳米管-还原氧化石墨烯（Ni（OH）2-CNTs-RGO）三元复合材料，研究了不同水热反应温度对三元复合材料性能的影响。采用XRD、FTIR、Raman、X射线光电子能谱（XPS）、SEM及TEM对Ni（OH）2-CNTs-RGO复合材料的结构和表面微观形貌进行表征。利用循环伏安（CV）、电化学交流阻抗（EIS）和恒电流充放电测试了复合电极材料的电化学性能。研究结果表明，当反应温度为120℃时，所制备的Ni（OH）2-CNTs-RGO复合材料具有大的比表面积和三维网状结构，复合材料中六角形的β-Ni（OH）2纳米片和CNTs均匀分散在RGO片层表面，有效阻止了RGO的团聚。Ni（OH）2-CNTs-RGO复合电极材料在充电倍率为0.2 C时，放电比容量达到362.8 mAh/g，5 C时放电比容量为286.2 mAh/g，仍大于Ni（OH）2在0.2 C时的放电比容量，表明CNTs与RGO的协同作用有效提高了电极材料的导电性和活性物质的利用率，最终提升了Ni（OH）2-CNTs-RGO复合材料的倍率性能。

     

    Abstract: Ni(OH)2-carbon nanotubes-reduced graphene oxide (Ni(OH)2-CNTs-RGO) ternary composites were synthesized by simple and practicable one-pot hydrothermal synthesis method. The influence of different reaction temperatures on properties of composite materials was researched. The microstructure and morphology of Ni(OH)2-CNTs-RGO composites were characterized by XRD, FTIR, Raman spectroscopy, X-ray photoelectron spectroscopy(XPS), SEM and TEM. The electrochemical characteristics of Ni(OH)2-CNTs-RGO electrode composites were tested by cyclic voltammetry(CV), electrochemical impedance spectroscopy(EIS) and galvanostatic charge/discharge. The results show that the prepared Ni(OH)2-CNTs-RGO composite has large specific surface area and 3D network structure when the reaction temperature is 120℃. The synthesized Ni(OH)2-CNTs-RGO composite shows that hexagonal β-Ni(OH)2 nano sheets and CNTs are homogeneously dispersed and inserted into RGO sheets. The Ni(OH)2-CNTs-RGO electrode composite exhibits the discharge specific capacity up to 362.8 mAh/g at 0.2 C and 286.2 mAh/g at 5 C, which is still higher than the specific capacity of Ni(OH)2. The CNTs and RGO collaborative role effectively improves the conductivity of the electrode material and the utilization of active material. Finally, the rate performance of Ni(OH)2-CNTs-RGO composite is improved.

     

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