分级孔rGO/NiO的异质自组装制备及其电化学性能

Synthesis of a rGO/NiO composite with a hierarchical pore structure by self-assembly and its electrochemical performance as a supercapacitor electrode

    摘要
  • 摘要: 采用异质自组装法制备得到氧化石墨烯/Ni（HCO3）2（GO/Ni（HCO3）2），经热还原分解后得到石墨烯/NiO（rGO/NiO）。通过XRD、SEM和N2吸脱附测试等手段详细研究了GO/Ni（HCO3）2向rGO/NiO转变过程中的结构变化，结果表明，rGO/NiO的比表面积和孔容分别为121.3 m2 g-1和0.26 cm3 g-1，呈分级孔分布，孔径主要分布为2~100 nm。大的比表面积和分级孔的分布使得rGO/NiO呈现出优异的电化学性能。在0.5 A g-1的电流密度下比电容是919 F g-1。当电流密度从0.5 A g-1提高至5 A g-1时，比电容保持率为71%。长周期循环稳定性结果显示，在2 A g-1的电流密度下循环3 000次后比电容保持率为91%。

     

    Abstract: A GO/Ni(HCO3)2 composite was synthesized by the self-assembly of layer Ni(HCO3)2 and GO in a mixed suspension under sonication, followed by heat treatment to obtain rGO/NiO for use as the electrode material of supercapacitors. The structural change from the GO/Ni(HCO3)2 to the rGO/NiO was investigated by XRD, SEM, and nitrogen adsorption. Results indicate that the rGO/NiO has a specific surface area of 121.3 m2 g-1 and pore volume of 0.26 cm3 g-1, and a hierarchical porous structure with a pore size range of 2-100 nm. The high specific surface area and the hierarchical porous structure give the rGO/NiO composite a high specific capacitance of 919 F g-1 (0.5 A g-1) and an excellent rate capability with a capacitance retention rate of 71% when the current density increases from 0.5 to 5 A g-1. The specific capacitance retains 91% of its original value after cycling at a current density of 2 A g-1 for 3 000 cycles, indicating good stability.

     

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