Li Yuzhu, Zhang Mengyuan, Zhang Boying, Li Bingke
College of Chemistry and Pharmaceutical Engineering, Nanyang Normal University, Nanyang 473061, China.
School of Biological and Chemical Engineering, Nanyang Institute of Technology, Nanyang 473004, China.
Molecules. 2024 Dec 14;29(24):5906. doi: 10.3390/molecules29245906.
Nickel disulfide (NiS) nanoparticles are encapsulated within nitrogen and sulfur co-doped carbon nanosheets, which are grown onto carbon nanofibers to form an array structure (NiS/C@CNF), resulting in a self-supporting film. This encapsulated structure not only prevents the agglomeration of NiS nanoparticles, but also memorably buffers its volume changes during charge/discharge cycles, thereby maintaining structural integrity. The nitrogen and sulfur co-doping enhances electronic conductivity and facilitates the faster ion transport of the carbon backbone, improving the low conductivity of the NiS/C@CNF anodes. Consequently, the NiS/C@CNF electrode exhibits a remarkable rate ability, reaching 55.4% of its capacity at 5 A g compared to that at 0.1 A g, alongside an impressive cycling stability, with 89.9% capacity retention over 1500 cycles at 2 A g. This work underscores the efficacy of the 3D carbon backbone encapsulation strategy for enhancing the sodium storage property of transition metal-based anodes.
二硫化镍（NiS）纳米颗粒被包裹在氮和硫共掺杂的碳纳米片中，这些碳纳米片生长在碳纳米纤维上形成阵列结构（NiS/C@CNF），从而得到一种自支撑膜。这种包裹结构不仅防止了NiS纳米颗粒的团聚，还显著缓冲了其在充放电循环过程中的体积变化，从而保持结构完整性。氮和硫的共掺杂提高了电子导电性，并促进了碳骨架中离子的更快传输，改善了NiS/C@CNF阳极的低导电性。因此，NiS/C@CNF电极表现出显著的倍率性能，在5 A g时的容量相对于0.1 A g时达到其容量的55.4%，同时具有令人印象深刻的循环稳定性，在2 A g下1500次循环后容量保持率为89.9%。这项工作强调了三维碳骨架包裹策略在增强过渡金属基阳极储钠性能方面的有效性。
