Abstract High electrochemical performance of supercapacitor electrodes largely rely on the heterostructure of different active component materials. Furthermore, the integration of Co3O4 nanowire (internal conductive highway) to bridge the Ni-Co layered double hydroxides nanosheets (provided high specific capacity), which is favorable for fast charge transfer, as well as improved conductivity. Thus, the Co3O4@Ni-Co LDH core-shell nanowire arrays electrodes exhibit a remarkable specific capacitance (1318 F·g−1 at 0.5 A·g−1) and also a relatively low resistance. Due to synergistic interaction of porous NiCo-LDH nanosheets and inner Co3O4 nanowire, an asymmetric supercapacitor (ASC) is assembled with Co3O4@Ni-Co LDH as the anode and active carbon as cathode. The as-fabricated ASC shows high energy density of 46.3 Wh·kg−1 and exhibit superior cyclic stability of 92% retention after 5000 cycles, suggesting this electrode is promising for efficient electrochemical capacitors.

中文翻译：

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Co3O4 纳米线@超薄 Ni-Co 层状双氢氧化物核壳阵列，具有用于高性能超级电容器的垂直传输通道

摘要 超级电容器电极的高电化学性能很大程度上依赖于不同活性成分材料的异质结构。此外，Co3O4 纳米线（内部导电高速公路）的集成以桥接 Ni-Co 层状双氢氧化物纳米片（提供高比容量），有利于快速电荷转移，并提高导电性。因此，Co3O4@Ni-Co LDH 核壳纳米线阵列电极表现出显着的比电容（1318 F·g-1，0.5 A·g-1）和相对较低的电阻。由于多孔NiCo-LDH纳米片和内部Co3O4纳米线的协同相互作用，以Co3O4@Ni-Co LDH为阳极、活性炭为阴极组装了不对称超级电容器（ASC）。制造的 ASC 显示出 46 的高能量密度。