Abstract：
The selection of highly efficient materials and the construction of advantageous structures are essential for realizing high-performance electrode materials. In this paper, electrode material Cu2S/C@NiMnCe-LDH/CF with excellent morphology and high performance has been successfully designed and prepared by simple hydrothermal and calcination techniques. First, ZIF-67 is loaded on the outer layer of Cu2S rods to obtain core-shell structured Cu2S@ZIF-67 rods, whose ZIF-67 MOF shell is carbonized to obtain Cu2S@C rods. Then, NiMnCe-LDH are epitaxially loaded on the outer layer of Cu2S@C to obtain Cu2S/C@NiMnCe-LDH rods. At a current density of 2 mA cm-2, Cu2S/C@NiMnCe-LDH/CF exhibits an area capacitance of 5176.4 mF cm-2. The mass capacitance and the energy density of the Cu2S/C@NiMnCe-LDH/CF//AC asymmetric supercapacitor (ASC) reach 150.82F g-1 at a sweep rate of 0.8 A/g and 53.62 Wh kg-1 at a power density of 639.99 W kg-1, respectively. Meanwhile, after 8000 electrochemical cycles, the specific capacitance of Cu2S/C@NiMnCe-LDH/CF//AC still has a retention rate of 86.32 %, which proves its excellent cycling stability. These results demonstrate a new strategy for the preparation of novel core-shell structured Cu2S/C@NiMnCe-LDH/CF nanocomposite material for electrode materials of energy storage devices with superb performance.
摘要：
高效材料的选择和有利结构的构造对于实现高性能电极材料至关重要。在本文中,通过简单的水热和煅烧技术，成功地设计并制备了具有优异形貌和高性能的电极材料Cu2S/C@NiMnCe-LDH/CF。首先,将ZIF-67负载在Cu2S棒的外层上，得到核壳结构的Cu2S@ZIF-67棒，将其ZIF-67MOF壳碳化以获得Cu2S@C棒。然后，将NiMnCe-LDH外延负载在Cu2S@C外层上，获得Cu2S/C@NiMnCe-LDH棒。在2mAcm-2的电流密度下，Cu2S/C@NiMnCe-LDH/CF的面积电容为5176.4mFcm-2。Cu2S/C@NiMnCe-LDH/CF//AC非对称超级电容器（ASC）的质量电容和能量密度在0.8A/g的扫描速率下达到150.82Fg-1，在功率密度为639.99Wkg-1的情况下达到53.62Whkg-1。同时,8000次电化学循环后，Cu2S/C@NiMnCe-LDH/CF//AC的比电容仍有86.32%的保留率,证明了其优异的循环稳定性。这些结果表明了制备新型核-壳结构Cu2S/C@NiMnCe-LDH/CF纳米复合材料的新策略，该材料用于储能器件的电极材料，具有出色的性能。
