水热法制备还原氧化石墨烯担载Ni(OH)2纳米带复合材料及其电容特性

Hydrothermal synthesis of Ni(OH)2/RGO nanocomposites with superior electrochemical performance

    摘要
  • 摘要: 以氧化石墨烯溶液和硝酸镍为原料，采用一步水热法制备了Ni（OH）2/还原氧化石墨烯（Ni（OH）2@RGO）复合材料。在Ni（OH）2/还原氧化石墨烯的研究中，两组分间的配比对复合物的形貌和电化学活性具有显著的影响。在最佳配比下（RGO含量26.7%），Ni（OH）2以纳米带形式担载于石墨烯片相互搭接成的三维网络结构中，从而可暴露更多的活性位点和有效比表面积，利于展现更好的电化学性能。该复合材料用作超级电容器电极材料时，展现了高的比电容（在1 A·g-1下的比电容高达1 804 F·g-1），良好的倍率性能（在25 A·g-1下比电容保持率仍在46%以上），以及优异的循环稳定性（在2 A·g-1下循环2 000次的电容保持率为90.3%）。

     

    Abstract: Ni(OH)2/reduced graphene oxide (RGO) nanocomposites for use as electrodes in electrochemical capacitors were prepared from GO and nickel nitrate by a one-step hydrothermal method. The content of RGO in the composites was controlled by changing the GO/nickel nitrate mass ratio. Results indicate that Ni(OH)2 nanobelts are dispersed uniformly in the three-dimensional conducting network constructed by the RGO, which is favorable for their capacitive performance. The RGO content to achieve the best performance is 26.7 wt%. The best sample has a high specific capacity of 1 804 F/g at 1 A/g, a remarkable capacitance retention rate of 46% even at 25 A/g, and an excellent cycle life with 90.3% capacitance retention after 2 000 cycles at 2 A/g.

     

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