The design and preparation of electrode materials with unique nanostructure are regarded as a significant strategy to increase the capacitance and cycling stability of energy storage devices. Herein, a starfish-like core–shell Ni(OH)2@CoS material grown on Ni foam (Ni(OH)2@CoS/NF, denoted as NOCS-1/NF) was successfully fabricated via a stepwise hydrothermal method. Benefiting from the unique starfish-like core–shell nanostructure, obvious and abundant heterogeneous interfaces, and good synergy between every component, the specific capacitance of the as-prepared Ni(OH)2@CoS-1/NF electrode can reach up to 981 F g−1 at 1 A g−1 and maintained 73.2% of initial value at a high current density of 10 A g−1 in 2 M KOH aqueous solution. Moreover, a hybrid supercapacitor was prepared by using core–shell NOCS-1/NF as positive electrode and activated carbon coated on the NF (AC/NF) as negative electrode. The HSC delivered a high energy density of 17.9 Wh kg−1 at a power density of 749 W kg−1 and a satisfying cycling life with 90.1% capacitance retention after 4000 cycles. Eventually, two such devices in series successfully illuminated a red light-emitting diode. Meanwhile, this work probably provides a simple and convenient strategy to fabricate novel materials for the applicability of various energy-related fields.

中文翻译：

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泡沫镍支撑的海星状 Ni(OH)2@CoS 纳米结构具有明显的核壳异质界面，用于混合超级电容器

具有独特纳米结构的电极材料的设计和制备被认为是提高储能装置电容和循环稳定性的重要策略。在此，通过逐步水热法成功制备了一种生长在泡沫镍上的海星状核壳 Ni(OH)2@CoS 材料（Ni(OH)2@CoS/NF，记为 NOCS-1/NF）。得益于独特的海星状核壳纳米结构、明显丰富的异质界面以及各组分之间良好的协同作用，所制备的Ni(OH)2@CoS-1/NF电极的比电容可达981 F g-1 在 1 A g-1 并在 2 M KOH 水溶液中以 10 A g-1 的高电流密度保持初始值的 73.2%。而且，以核壳型NOCS-1/NF为正极，活性炭包覆在NF上（AC/NF）为负极，制备了混合超级电容器。HSC 在 749 W kg-1 的功率密度下提供了 17.9 Wh kg-1 的高能量密度和令人满意的循环寿命，4000 次循环后电容保持率为 90.1%。最终，两个这样的串联器件成功地点亮了一个红色发光二极管。同时，这项工作可能为制造适用于各种能源相关领域的新型材料提供了一种简单方便的策略。两个这样的串联装置成功地点亮了一个红色发光二极管。同时，这项工作可能为制造适用于各种能源相关领域的新型材料提供了一种简单方便的策略。两个这样的串联装置成功地点亮了一个红色发光二极管。同时，这项工作可能为制造适用于各种能源相关领域的新型材料提供了一种简单方便的策略。