Significant volume changes and slow ionic transport during charge/discharge processes restrict the improvement of electrochemical performance for CuS (x = 1–2). Herein, a new strategy by introducing Cu-BTC (copper(II)-benzene-1,3,5-tricarboxylate) as a processor to derive three-dimensional CuS@C using green sulfurization and calcination methods is proposed. Benefiting from the high electrical conductivity, multistage pore size structure and stable structure brought by the conductive carbon skeleton after calcination, CuS@C-650C exhibits a high specific capacitance of 291.1 F g at a current density of 1 A g and a superior rate capability of 83.6 % at a current density of 10 A g. In addition, the assembled asymmetric supercapacitor (CuS@C-650C//AC ASC) also shows impressive performances, such as an energy density up to 16 Wh kg at a power density of 352 W kg and an excellent cycling stability of 93.1 % over 5000 cycles at a current density of 2 A g. This work demonstrates that the Cu-BTC-derived CuS@C is an attractive material with potential applications in energy storage devices.

中文翻译：

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Cu-MOFs 衍生的三维 Cu1.81S@C 具有高储能性能


充放电过程中显着的体积变化和缓慢的离子传输限制了 CuS (x = 1–2) 电化学性能的提高。在此，提出了一种新策略，通过引入Cu-BTC（铜(II)-苯-1,3,5-三羧酸盐）作为处理器，利用绿色硫化和煅烧方法衍生出三维CuS@C。得益于导电碳骨架在煅烧后带来的高导电率、多级孔径结构和稳定的结构，CuS@C-650C在1 A g的电流密度下表现出291.1 F g的高比电容和优越的倍率性能在电流密度为 10 A g 时为 83.6 %。此外，组装的非对称超级电容器（CuS@C-650C//AC ASC）还表现出令人印象深刻的性能，例如在功率密度为352 W kg时能量密度高达16 Wh kg，并且具有高达93.1 %的优异循环稳定性。在 2 A g 电流密度下循环 5000 次。这项工作表明，Cu-BTC 衍生的 CuS@C 是一种有吸引力的材料，在储能设备中具有潜在的应用前景。