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首页> 外文期刊>Advanced Functional Materials >Nickel-Cobalt Layered Double Hydroxide Nanosheets for High-performance Supercapacitor Electrode Materials
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Nickel-Cobalt Layered Double Hydroxide Nanosheets for High-performance Supercapacitor Electrode Materials

机译：用于高性能超级电容器电极材料的镍钴层状双氢氧化物纳米片

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摘要

A facile and novel one-step method of growing nickel-cobalt layered double hydroxide (Ni-Co LDH) hybrid films with ultrathin nanosheets and porous nanostructures on nickel foam is presented using cetyltrimethylammonium bromide as nanostructure growth assisting agent but without any adscititious alkali sources and oxidants. As pseudocapacitors, the as-obtained Ni-Co LDH hybrid film-based electrodes display a significantly enhanced specific capacitance (2682 F g~(-1) at 3 A g~(-1) based on active materials) and energy density (77.3 Wh kg~(-1) at 623 W kg~(-1), compared to most previously reported electrodes based on nickel-cobalt oxides/hydroxides. Moreover, the asymmetric supercapacitor, with the Ni-Co LDH hybrid film as the positive electrode material and porous freeze-dried reduced graphene oxide (RCO) as the negative electrode material, exhibits an ultrahigh energy density (188 Wh kg~(-1)) at an average power density of 1499 W kg~(-1) based on the mass of active material, which greatly exceeds the energy densities of most previously reported nickel or cobalt oxide/hydroxide-based asymmetric supercapacitors.
机译：提出了一种使用十六烷基三甲基溴化铵作为纳米结构生长助剂，但没有任何吸附性碱源的，在镍泡沫上生长具有超薄纳米片和多孔纳米结构的镍钴层状双氢氧化物（Ni-Co LDH）杂化膜的简便新颖方法。氧化剂。作为伪电容器，如此获得的Ni-Co LDH杂化膜基电极表现出显着增强的比电容（基于活性材料在3 A g〜（-1）下为2682 F g〜（-1））和能量密度（77.3）与以前报道的大多数基于镍钴氧化物/氢氧化物的电极相比，Wh kg〜（-1）在623 W kg〜（-1）处；此外，不对称超级电容器以Ni-Co LDH杂化膜为正极该材料和多孔冷冻干燥的还原氧化石墨烯（RCO）作为负极材料，在基于1499 W kg〜（-1）的平均功率密度下表现出超高能量密度（188 Wh kg〜（-1））。活性材料的质量，大大超过了大多数以前报道的镍或钴氧化物/氢氧化物基不对称超级电容器的能量密度。

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  • 来源
    《Advanced Functional Materials》 |2014年第7期|934-942|共9页
  • 作者

    Hao Chen; Linfeng Hu; Min Chen; Yan Yan; Limin Wu;

  • 作者单位

    Department of Materials Science and Advanced Materials Laboratory Fudan University Shanghai, 200433, China;

    Department of Materials Science and Advanced Materials Laboratory Fudan University Shanghai, 200433, China;

    Department of Materials Science and Advanced Materials Laboratory Fudan University Shanghai, 200433, China;

    Department of Materials Science and Advanced Materials Laboratory Fudan University Shanghai, 200433, China;

    Department of Materials Science and Advanced Materials Laboratory Fudan University Shanghai, 200433, China;

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