A novel Co–Co LDH/C/Ni(OH)₂ nanostructure was constructed by loading Ni(OH)₂ nanodots on hollow Co–Co LDH/C nanocages derived from MOFs. The Co–Co LDH/C/Ni(OH)₂ nanostructure revealed a high specific capacitance of up to 1426 F g⁻¹ at 1 A g⁻¹ and an outstanding rate capability with 90.2% retention at 10 A g⁻¹ owing to the cooperative effect of the Ni(OH)₂ nanodots and hollow Co–Co LDH/C nanocages. The electrochemical kinetic analysis showed that the Co–Co LDH/C/Ni(OH)₂ electrode was dominated by surface capacitance control, demonstrating the origins of performance improvement. This work may provide an effective strategy by combining nanodots with hollow porous structures for low-cost and efficient energy storage materials.

中文翻译：

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Ni（OH）2纳米点装饰的Co-Co LDH / C空心纳米笼，用于高性能超级电容器

通过将Ni（OH）₂纳米点负载在衍生自MOF的空心Co-Co LDH / C纳米笼中，构建了一种新型的Co-Co LDH / C / Ni（OH）₂纳米结构。Co-Co LDH / C / Ni（OH）₂纳米结构在1 A g ^-1下显示出高达1426 F g ^-1的高比电容，并由于在10 A g ^-1下具有90.2％的保留率而具有出色的速率能力。Ni（OH）₂纳米点和空心Co-Co LDH / C纳米笼的协同作用。电化学动力学分析表明，Co-Co LDH / C / Ni（OH）₂电极受表面电容控制的支配，证明了性能提高的根源。这项工作可以通过将纳米点与空心多孔结构相结合来提供一种低成本和高效的储能材料，从而提供有效的策略。