Metal sulfides with nanostructures have attracted much attention in the research of supercapacitor electrode materials due to their excellent electrochemical properties. This paper used a simple, energy-saving and rapid hydrothermal method combined with an electrochemical deposition method to prepare the Co₃S₄/Ni_0.96S composite with a porous ultrathin nanosheet structure. The results show that non-stoichiometric Ni_0.96S nanocrystals provide abundant defects and nickel vacancies. The porous nanosheet structure formed by the Co₃S₄/Ni_0.96S composite provides a large specific surface area, which is more conducive to promoting ion transport. For this reason, the electrolyte can penetrate the Co₃S₄/Ni_0.96S nanoscale, while also giving the entire electrode material a rich conductive path and cycle durability. In summary, the optimized Co₃S₄/Ni_0.96S composite has the largest specific capacitance (1102.0 C g⁻¹) in the three-electrode system. In addition, asymmetric supercapacitors composed of Co₃S₄/Ni_0.96S have a high energy density (40.6 Wh kg⁻¹ at 800.0 W kg⁻¹). This work provides a simple and effective strategy for designing metal sulfide composites and applying them to energy storage devices.

具有纳米结构的金属硫化物因其优异的电化学性能在超级电容器电极材料的研究中备受关注。本文采用简单、节能、快速的水热法结合电化学沉积法制备了多孔超薄纳米片结构的Co ₃ S ₄ /Ni _{0.96 S复合材料。}结果表明，非化学计量的Ni _0.96 S纳米晶提供了丰富的缺陷和镍空位。_{Co 3} S ₄ /Ni _{0.96 S复合材料}形成的多孔纳米片结构提供了较大的比表面积，更有利于促进离子传输。为此，电解液可以渗透Co ₃ S ₄ /Ni _0.96 S纳米级，同时也赋予整个电极材料丰富的导电路径和循环耐久性。综上所述，优化后的Co ₃ S ₄ /Ni _{0.96 S复合材料}在三电极系统中具有最大的比电容（1102.0 C g ^{-1 ）。}此外，由Co ₃ S ₄ /Ni _0.96 S组成的非对称超级电容器具有高能量密度（800.0 W kg ^-1时为40.6 Wh kg ^-1）。这项工作为设计金属硫化物复合材料并将其应用于储能装置提供了一种简单有效的策略。