Constructing hierarchical core‐shell configuration from well‐known metal sulfides is one way to further tune and utilize unique species. Herein, a novel core‐shell structure is developed based on CoS deposited on NiS nanosheets, which involves hydrothermal and electrodeposition method. The micromorphology of the composite electrode can be optimized by adjusting the cycles of electrodeposition. Taking advantages of the highly conductive, open framework of the core‐shell nanolayer, the 5‐NiS@CoS electrode shows a specific capacitance of 1210 F g⁻¹ at a current density of 1 A g⁻¹ (retaining 82% from 1 to 10 A g⁻¹, while NiS substrate is only 39%). The specific capacitance retention rate is 80.94% at 10 A g⁻¹ after 2000 cycles (NiS substrate is 59.6%). Moreover, NiS@CoS//AC asymmetric supercapacitor device delivers an energy density of 24.1 Wh kg⁻¹ at a power density of 752.15 W kg⁻¹ and remarkable stability (over 80% retention after 5000 cycles). This work may prompt the exploration of the synthesis of inexpensive compounds incorporating highly reactive components for supercapacitors.

中文翻译：

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具有两步控制策略的超级电容器电极，具有可控制的核壳结构的分层NiS @ CoS

用著名的金属硫化物构造分级的核-壳结构是进一步调整和利用独特种类的一种方法。本文中，基于沉积在NiS纳米片上的CoS，开发了一种新颖的核-壳结构，该结构涉及水热法和电沉积法。复合电极的微观形态可以通过调整电沉积的周期来优化。5-NiS @ CoS电极利用核-壳纳米层的高导电性，开放框架的优势，在1 A g ^-1的电流密度下显示出1210 F g ^-1的比电容（从1到1保持82％的比电容）。10 A g ^-1，而NiS衬底仅为39％）。在10 A g ^-1时的比电容保持率为80.94％在2000次循环后（NiS底物为59.6％）。此外，NiS @ CoS // AC不对称超级电容器器件在752.15 W kg ^-1的功率密度下可提供24.1 Wh kg ^-1的能量密度和出色的稳定性（5000次循环后保持80％以上的保持率）。这项工作可能会促使人们探索结合用于超级电容器的具有高反应性组分的廉价化合物的合成方法。