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首页> 外文期刊>Chemistry: A European journal >Mesoporous Carbon Nanofibers Embedded with MoS2 Nanocrystals for Extraordinary Li-Ion Storage
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Mesoporous Carbon Nanofibers Embedded with MoS2 Nanocrystals for Extraordinary Li-Ion Storage

机译：嵌入MoS2纳米晶体的中孔碳纳米纤维，用于非常规锂离子存储

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摘要

MoS2 nanocrystals embedded in mesoporous carbon nanofibers are synthesized through an electrospinning process followed by calcination. The resultant nanofibers are 100-150 nm in diameter and constructed from MoS2 nanocrystals with a lateral diameter of around 7 nm with specific surface areas of 135.9 m(2)g(-1). The MoS2@C nanofibers are treated at 450 degrees C in H-2 and comparison samples annealed at 800 degrees C in N-2. The heat treatments are designed to achieve good crystallinity and desired mesoporous microstructure, resulting in enhanced electrochemical performance. The small amount of oxygen in the nanofibers annealed in H-2 contributes to obtaining a lower internal resistance, and thus, improving the conductivity. The results show that the nanofibers obtained at 450 degrees C in H-2 deliver an extraordinary capacity of 1022 mA hg(-1) and improved cyclic stability, with only 2.3% capacity loss after 165 cycles at a current density of 100 mAg(-1), as well as an outstanding rate capability. The greatly improved kinetics and cycling stability of the mesoporous MoS2@C nanofibers can be attributed to the crosslinked conductive carbon nanofibers, the large specific surface area, the good crystallinity of MoS2, and the robust mesoporous microstructure. The resulting nanofiber electrodes, with short mass-and charge-transport pathways, improved electrical conductivity, and large contact area exposed to electrolyte, permitting fast diffusional flux of Li ions, explains the improved kinetics of the interfacial charge-ransfer reaction and the diffusivity of the MoS2@C mesoporous nanofibers. It is believed that the integration of MoS2 nanocrystals and mesoporous carbon nanofibers may have a synergistic effect, giving a promising anode, and widening the applicability range into high performance and mass production in the Li-ion battery market.
机译：嵌入中孔碳纳米纤维中的MoS2纳米晶体是通过电纺丝过程随后煅烧合成的。所得的纳米纤维直径为100-150 nm，由MoS2纳米晶体构成，其横向直径约为7 nm，比表面积为135.9 m（2）g（-1）。 MoS2 @ C纳米纤维在H-2中在450摄氏度下进行处理，而比较样品在N-2中在800摄氏度下进行退火。热处理旨在获得良好的结晶度和所需的介孔微观结构，从而增强电化学性能。在H-2中退火的纳米纤维中的少量氧气有助于获得较低的内部电阻，因此改善了导电性。结果表明，在H-2下在450摄氏度下获得的纳米纤维具有1022 mA hg（-1）的超常容量并改善了循环稳定性，在165次循环后在100 mAg（-）的电流密度下仅损失2.3％的容量。 1）以及出色的费率功能。介孔MoS2 @ C纳米纤维的动力学和循环稳定性大大提高，可归因于交联的导电碳纳米纤维，比表面积大，MoS2的良好结晶性和稳健的介孔微观结构。所得的纳米纤维电极具有短的质量和电荷传输路径，改善的电导率以及与电解质接触的较大接触面积，允许Li离子快速扩散通量，这说明了界面电荷转移反应的动力学改善以及Ni的扩散性提高。 MoS2 @ C介孔纳米纤维。可以相信，MoS 2纳米晶体和中孔碳纳米纤维的集成可能具有协同作用，提供有希望的阳极，并扩大了锂离子电池市场中高性能和大规模生产的适用范围。

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