Supercapacitors possess minimum energy density, lower rate capability, and inferior long-term cycling stability performance, and these issues have restricted their practical applications. In these circumstances, supercapacitors based on a new class of hybrid nanomaterial are strongly desirable. Herein, for the first time, a complex nanoarchitecture comprised of a ZnS–Ni₇S₆/Ni(OH)₂ core/shell is constructed via a multistep hydrothermal process. The ZnS–Ni₇S₆/Ni(OH)₂ core/shell nanoarchitecture illustrates a commendable areal capacitance of 13.55 F cm^–2 at a lower current density value of 5 mA cm^–2, respectively. The ZnS–Ni₇S₆/Ni(OH)₂ core/shell hybrid nanomaterial maintains a high cycling stability performance of 95.12% after a maximum 10 000 number of cycles. Moreover, the asymmetric supercapacitor device made up of ZnS–Ni₇S₆/Ni(OH)₂ and nitrogen–sulfur-codoped graphene nanosheets (NSGNs) delivers an ultrahigh energy density value of 68.85 W h kg^–1 at a power density of 700.16 W kg^–1. The cycling stability of the ZnS–Ni₇S₆/Ni(OH)₂//NSGN asymmetric supercapacitor was performed and was 91.79% after 10 000 GCD cycles. The ZnS–Ni₇S₆/Ni(OH)₂ core/shell hybrid electrode material has helped in promoting an asymmetric supercapacitor device with an elevated performance and can be considered as a potential electrode material to develop energy storage devices in the future.

中文翻译：

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Ni（OH）₂纳米花瓣包裹的ZnS–Ni ₇ S ₆纳米片阵列，作为新型核壳电极材料，用于具有高能量密度和循环稳定性的不对称超级电容器

超级电容器具有最小的能量密度，较低的倍率能力和较差的长期循环稳定性能，这些问题限制了它们的实际应用。在这些情况下，非常需要基于新型混合纳米材料的超级电容器。本文中，首次通过多步水热法构建了由ZnS–Ni ₇ S ₆ / Ni（OH）₂核/壳组成的复杂纳米结构。ZnS–Ni ₇ S ₆ / Ni（OH）₂核/壳纳米体系结构在较低的电流密度值为5 mA cm ^–2时分别具有13.55 F cm ^–2的值得称赞的面积电容。ZnS–Ni₇ S ₆ / Ni（OH）₂核/壳杂化纳米材料在最多10 000次循环后仍保持95.12％的高循环稳定性能。此外，由ZnS-Ni ₇ S ₆ / Ni（OH）₂和氮-硫共掺杂的石墨烯纳米片（NSGNs）组成的非对称超级电容器器件在功率密度为70瓦时可提供68.85 W h kg ^–1的超高能量密度值。 700.16 W公斤^–1。进行了ZnS–Ni ₇ S ₆ / Ni（OH）₂ // NSGN不对称超级电容器的循环稳定性，在1万次GCD循环后，其循环稳定性为91.79％。ZnS–Ni ₇ S ₆/ Ni（OH）₂核/壳混合电极材料有助于提高性能的不对称超级电容器器件，并且可以被认为是将来开发储能器件的潜在电极材料。