Abstract
Two-dimensional (2D) molybdenum disulfide (MoS2) holds significant promise as an energy storage material, whereas the exfoliation of MoS2 into few-layer from natural molybdenites remains a challenge. An efficient electrochemical strategy was proposed for the preparation of few-layer MoS2 through cationic intercalation. Few-layer MoS2 without the impurity phases was obtained with high yield through Raman mapping analysis, and the intermediate (TBA+)xMoS2x− was captured by in-situ Raman. Note that the charge transport kinetics of the exfoliated few-layer MoS2 was further enhanced by the introduction of graphene, which could efficiently enhance the Na+ diffusion mobility, alleviate the volume change of MoS2 and stabilize the reaction products. Commendably, the exfoliated MoS2/graphene hybrid shows a reversible specific capacity of 642.8 mA h g−1 at 0.1 A g−1, superior rate performance (447.8 and 361.9 mA h g−1 at 1 and 5 A g−1, respectively) and remarkable long-cycle stability with 328.7 mA h g−1 at 1 A g−1 after 1000 cycles for sodium-ion batteries (SIBs). Therefore, this efficient electrochemical exfoliation method can be driven to prepare other few-layer 2D materials for SIBs.
摘要
二维结构的二硫化钼(MoS2)是一种很有前景的储能材料, 然而从天然辉钼矿中剥离出少片层的二硫化钼层仍是一个难题. 本文提出了一种有效的电化学阳离子插层制备少片层MoS2的策略. 通过原位拉曼捕获电化学插层过程中的中间产物(TBA+)xMoS2x−, 拉曼映射分析结果表明获得了具有高产率和无相变的少片层MoS2. 值得注意的是, 石墨烯的引入进一步增强了剥离的少片层MoS2的电荷迁移动力学, 可以有效增强钠离子的扩散迁移率, 缓解MoS2在充放电过程中的体积变化以及稳定反应产物. E-MoS2/graphene 作为钠离子电池负极材料, 其可逆比容量为642.8 mA h g−1 (@0.1 A g−1), 并表现出优异的倍率性能(比容量分别为447.8和361.9 mA h g−1@1和5 A g−1)以及卓越的长周期循环稳定性, 在1 A g−1 的电流密度下, 1000次循环后的可逆比容量为328.7 mA h g−1. 这种 高效的电化学剥离方法也可用于制备其他二维少片层钠离子电池电极材料.
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Acknowledgements
This work was supported by the National Natural Science Foundation of China (51622406, 21673298, and 21473258), the National Key Research and Development Program of China (2017YFB0102000 and 2018YFB0104200) and the Project of Innovation Driven Plan in Central South University (2017CX004 and 2018CX005).
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Author contributions Shuai H conceived the idea, carried out the experiments, material characterizations and electrochemical measurements, and wrote the paper under the guidance from Ji X. Li J and Zhang X conducted the in-situ Raman characterization. Jiang F and Sun W offered the pristine molybdenite bulk. Xu L and Hu J conducted the XRD characterization. Duan H and Hu J gave pivotal advice. Hou H and Zou G assisted in the date analysis. All authors discussed the results and commented on the manuscript.
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Honglei Shuai received his Master degree from Xinyang Normal University in 2017. He is currently working toward a PhD degree at Central South University and his current research focuses on the energy storage materials and devices through electrochemical methods.
Xiaobo Ji is a “Shenghua” Professor at Central South University and a Fellow of the Royal Society of Chemistry, specializing in the research and development of batteries and supercapacitor materials and their systems. He received his PhD in electrochemistry in 2007 under the supervision of Prof. Richard Compton at the University of Oxford and undertook postdoctoral work at MIT with Prof. Donald Sadoway.
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Electrochemically intercalated intermediate induced exfoliation of few-layer MoS2 from molybdenite for long-life sodium storage
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Shuai, H., Li, J., Jiang, F. et al. Electrochemically intercalated intermediate induced exfoliation of few-layer MoS2 from molybdenite for long-life sodium storage. Sci. China Mater. 64, 115–127 (2021). https://doi.org/10.1007/s40843-020-1347-5
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DOI: https://doi.org/10.1007/s40843-020-1347-5