In this paper, two-component nanocages containing CoS_x and nickel-cobalt layered double hydroxides (Ni-Co LDH) were facilely synthesized via a multistep transformation approach. The zeolitic imidazolate framework-67 (ZIF-67) nanocrystals were firstly synthesized, and then after partial sulfuration, the CoS_x/Ni-Co LDH nanocages were achieved by adding nickel ions for etching and precipitation. The prepared CoS_x/Ni-Co LDH nanocages consisted of the hollow rhombic dodecahedral morphology with many nanosheets arrays on the shell. When used as electrode materials for electrochemical capacitors, this CoS_x/Ni-Co LDH nanocages deliver a specific capacitance of 1562 F g⁻¹ at a current density of 1 A g⁻¹. In addition, an asymmetric supercapacitor assembled with CoS_x/Ni-Co LDH as cathode and active carbon (AC) as anode shows a high energy density of 35.8 Wh kg⁻¹ at a power density of 800 W kg⁻¹ and has an excellent cycling performance with the retention rate of 94.56% after 10,000 cycles, suggesting their potential application in high-performance electrochemical capacitors. These exceptional electrochemical properties can be attributed to the unique structure and synergistic effects between the metal sulfide and the bimetallic hydroxide, which also indicate the potential application of CoS_x/Ni-Co LDH nanocages in high-performance supercapacitors.

在本文中，通过多步转化方法轻松合成了包含CoS _x和镍钴层状双氢氧化物（Ni-Co LDH）的两组分纳米笼。首先合成了沸石咪唑盐骨架-67（ZIF-67）纳米晶体，然后进行部分硫化，通过添加镍离子进行蚀刻和沉淀来制备CoS _x / Ni-Co LDH纳米笼。制备的CoS _x / Ni-Co LDH纳米笼由空心菱形十二面体形态和壳上的许多纳米片阵列组成。当用作电化学电容器的电极材料时，此CoS _x / Ni-Co LDH纳米笼在1 A g ^-1的电流密度下可提供1562 F g ^-1的比电容。。另外，以CoS _x / Ni-Co LDH为阴极并以活性炭（AC）为阳极组装而成的不对称超级电容器在功率密度为800 W kg ^-1时显示出35.8 Wh kg ^-1的高能量密度，并且具有出色的性能。 10,000次循环后的保留率为94.56％的循环性能，表明它们在高性能电化学电容器中的潜在应用。这些优异的电化学性能可归因于金属硫化物和双金属氢氧化物之间的独特结构和协同效应，这也表明CoS _x / Ni-Co LDH纳米笼在高性能超级电容器中的潜在应用。