Although ternary cobalt nickel sulfide is a promising electrode material for supercapacitors, its wide application is limited by its relatively poor electrochemical stability, low rate capacity and inefficient nanostructure. Here, we demonstrate that the electrochemical activity of cobalt nickel sulfide can be significantly improved by synergy from a Co-MOF-derived Co₃O₄ skeleton. We design and fabricate petal-like Co₃O₄@CoNi₂S₄ nanowall arrays combined with carbon cloth as an excellent self-standing electrode for asymmetric supercapacitors. The Co₃O₄@CoNi₂S₄ electrode exhibits a high specific capacitance of 244.4 mA h g⁻¹ at a current density of 1 A g⁻¹ and an excellent rate capability of 81.3% at 16 A g⁻¹. Furthermore, the assembled Co₃O₄@CoNi₂S₄//AC asymmetric supercapacitor (ASC) shows a high energy density of 55.6 W h kg⁻¹ at a power density of 884.4 W kg⁻¹, and the capacitance retention of Co₃O₄@CoNi₂S₄ is up to 86% after 10 000 cycles. It is believed that the presented work opens up a new strategy to fabricate high-performance supercapacitor electrodes.

中文翻译：

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金属-有机骨架在碳布上衍生的花瓣状Co3O4 @ CoNi2S4杂化物，具有增强的超级电容器性能

尽管三元钴镍硫化物是用于超级电容器的有希望的电极材料，但是其相对较差的电化学稳定性，低倍率容量和低效率的纳米结构限制了其广泛的应用。在这里，我们证明了钴-MOF衍生的Co ₃ O ₄骨架的协同作用可以大大提高钴镍硫化物的电化学活性。我们设计并制造了花瓣状的Co ₃ O ₄ @CoNi ₂ S ₄纳米壁阵列，并与碳布相结合，作为非对称超级电容器的出色自立电​​极。Co ₃ O ₄ @CoNi ₂ S ₄电极在1 A g ^-1的电流密度下表现出244.4 mA hg ^-1的高比电容，在16 A g ^-1时具有81.3％的优良倍率能力。此外，组装的Co ₃ O ₄ @CoNi ₂ S ₄ // AC不对称超级电容器（ASC）在884.4 W kg ^-1的功率密度下显示出55.6 W h kg ^-1的高能量密度，并且Co的电容保持率₃ O ₄ @CoNi ₂ S ₄在1万次循环后高达86％。可以认为，提出的工作为制造高性能超级电容器电极开辟了新的战略。