Abstract Hierarchical architecture hybrid materials with excellent synergistic effect have been paid close attention for their potential applications in energy storage devices. Herein, we reported an electrode of Co Ni layered double hydroxides (LDH) nanosheets electrodeposited on Co3O4 nanoneedles derived from 2D Co-based metal-organic frameworks (Co-MOFs) combined with flexible carbon cloth (Co Ni LDH@Co3O4@CC) for asymmetric supercapacitors (ASCs). The Co3O4 nanoneedles served not only as a good pseudocapacitive material but also as an excellent porous skeleton for electrodepositing Co Ni LDH nanosheets. The combination of hierarchical core-branch architecture and heterogeneous structure endowed the Co Ni LDH@Co3O4@CC electrode with superior electrochemical performance with high specific capacitance (1021.7 F g−1 at 10 A g−1) and good rate capability. Furthermore, the ASC composed of the Co Ni LDH@Co3O4@CC as a cathode and N-doped porous carbon nanosheets grown on the carbon cloth (NC@CC) as an anode achieved a superior energy density of 33.4 W h kg−1 at a power density of 1600 W kg−1 and a long cycle life (93.46% after 10,000 cycles at 4 A g−1). As a result, this work demonstrated an efficient method for rational design and preparation of the hierarchical core-branch architecture hybrid electrodes for supercapacitors.

中文翻译：

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用于高性能非对称超级电容器的二维金属-有机骨架在 Co3O4 纳米针上电沉积 Co Ni 层状双氢氧化物的合理设计

摘要 具有优异协同效应的分层结构杂化材料因其在储能器件中的潜在应用而受到密切关注。在此，我们报道了一种电沉积在 Co3O4 纳米针上的 Co Ni 层状双氢氧化物 (LDH) 纳米片电极，该纳米针源自二维 Co 基金属有机框架 (Co-MOFs) 与柔性碳布 (Co Ni LDH@Co3O4@CC) 结合，用于不对称超级电容器 (ASC)。Co3O4 纳米针不仅是一种良好的赝电容材料，而且还是用于电沉积 Co Ni LDH 纳米片的优良多孔骨架。分级核-支结构和异质结构的结合使 Co Ni LDH@Co3O4@CC 电极具有优异的电化学性能和高比电容（1021. 7 F g-1 at 10 A g-1) 和良好的倍率能力。此外，由 Co Ni LDH@Co3O4@CC 作为阴极和在碳布（NC@CC）上生长的 N 掺杂多孔碳纳米片作为阳极组成的 ASC 在1600 W kg-1 的功率密度和长循环寿命（4 A g-1 下 10,000 次循环后为 93.46%）。因此，这项工作展示了一种合理设计和制备用于超级电容器的分层核心-分支结构混合电极的有效方法。