Synthesis and Li-Ion Storage Properties of Hierarchical C-Coated MoS2 Nanobelts
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摘要: 以钼粉、过氧化氢 (30%) 、苹果酸、硫脲为原料, 通过连续的水热法-热分解碳包覆, 制备出了分级结构的C@MoS2@C纳米带, 并通过X射线衍射、扫描透射及电化学性能表征方法对该纳米复合材料的形貌结构、组成成分及锂电性能进行测试。研究结果表明, 通过该连续的水热法-热分解碳包覆, 以碳包覆的三氧化钼纳米带为模板, 制备出分级结构的C@MoS2纳米带复合材料, 其MoS2纳米片均匀的负载在碳层表面, 通过再一次简单的热分解碳包覆, 实现了在MoS2表面均匀覆盖一层无定形碳, 得到了三层分级结构的C@MoS2@C纳米带复合材料。通过这种形貌结构的筑造, 极大提高了其作为锂电负极材料的导电性、结构稳定性, 该材料作为锂电负极材料在0.2 A/g的恒流充放电下循环100次后放电比容量达到1025.5m Ah/g, 在1.0 A/g的大电流充放电循环中放电比容量仍然达到820 m Ah/g。Abstract: The thin films, comprising hierarchical C-coated MoS2 (C@MoS2@C) nanobelts, were synthesized by continuous hydrothermal-decomposition with reactants of Mo-powder, H2O2 (30%), malic acid and thiourea. The microstructures and Li-ion storage behavior of the C@MoS2@C nanobelts were investigated with X-ray diffraction, scanning electron microscopy, transmission electron microscopy and cyclic voltammetry. The results show that the C@MoS2@C nanobelts with good Li-ion storage capacity can be synthesized by hydrothermal-decomposition. For example, when cycled for 100 times at 0. 2 A/g and 1. 0 A/g, the specific capacity of the rate-capacity of the C@MoS2@C nanobelts was 1025. 5 and 820 m Ahg-1, respectively. The C-coated MoS2 nanobelts can be synthesized by hydrothermal-decomposition decomposition of the C-coated MoO3-precursor; while keeping the nano-structures intact, the Ccoating is capable of promoting MoS2 nano-sheets formation on the surface of C-template, significantly increasing the MoS2-conductivity. The as-synthesized C@MoS2@C films possess high conductivity and structural stability.
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Keywords:
- Solution method /
- C@MoS2@C /
- Nanobelts /
- Hybrid nanomaterials
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