In recent years, the concept of sustainable development has encouraged the development and application of green, natural, and recyclable energy storage devices. Herein, using Ni(NO₃)₂0.6 H₂O and Co(NO₃)₂0.6 H₂O as raw material and K₂S₂O₈ as a vulcanizing agent, NiCo₂S₄ nanomaterials@C₃N₄ (NCS@C₃N₄) composite was prepared by a one-step solvothermal method, in which the introduction of C₃N₄ significantly improves the dispersion of NCS, while the petal-like NCS also expands the layer spacing of C₃N₄, which effectively alleviates the structural instability and promotes the exposure of stable active sites during charge and discharge. Physical structure and electrochemical characterizations showed that the NCS were distributed on the surface of the C₃N₄ nanosheets, which reduced the stacking of the nanosheets and accelerated the charge transfer during the charging and discharging process. The specific capacity (C_sp) of the NCS@C₃N₄ composite electrode was up to 890.4 C/g at a current density of 1 A/g. In addition, the supercapacitor consisting of NCS@C₃N₄ composite electrode had good cycling stability and still displayed excellent capacitance retention after 3000 cycles. The NCS@C₃N₄ composite greatly optimizes the stability and extends the operating life of supercapacitors, which has a broad application potential in the field of energy storage devices.

近年来，可持续发展理念鼓励绿色、天然、可回收的储能装置的开发和应用。本文以Ni(NO ₃ ) ₂ 0.6 H ₂ O和Co(NO ₃ ) ₂ 0.6 H ₂ O为原料，K ₂ S ₂ O ₈为硫化剂，制备了NiCo ₂ S ₄纳米材料@C ₃ N ₄ ( NCS@C ₃ N ₄ ) 复合材料采用一步溶剂热法制备，其中引入 C ₃ N ₄显着改善了NCS的分散性，而花瓣状的NCS也扩大了C ₃ N ₄的层间距，有效缓解了结构的不稳定性，促进了充放电过程中稳定活性位点的暴露。物理结构和电化学表征表明，NCS分布在C ₃ N ₄纳米片的表面，减少了纳米片的堆积，加速了充放电过程中的电荷转移。NCS@C ₃ N ₄的比容量 ( C _{sp )}复合电极在电流密度为 1 A/g 时最高可达 890.4 C/g。此外，由NCS@C ₃ N ₄复合电极组成的超级电容器具有良好的循环稳定性，并且在3000次循环后仍表现出优异的电容保持率。NCS@C ₃ N ₄复合材料极大地优化了超级电容器的稳定性并延长了使用寿命，在储能器件领域具有广泛的应用潜力。