Abstract
Herein, we describe a simple and efficient method to build C@MoSe2@CNT composites that exhibit good electrochemical performance as anode materials for sodium-ion batteries. The protocol uses commercially available and cheap carbon nanotubes (CNT) as the conductive network. Molybdenum selenide (MoSe2), in-situ-synthesized from Mo-ethylene glycol (poly(ethylene glycol) (PEG, Mn ≈ 200)) complexes, grows along the CNT with a discontinuous morphology, which creates multiple channels for the insertion of Na+. Meanwhile, PEG-C provides a thin carbon coating layer to increase stability. For PEG-200-2-C/MoSe2/CNT at room temperature, the storage at 2 A g−1 is 426 mA h g−1 after 500 cycles and 212 mA h g−1 after 3,000 cycles. Compared with pure MoSe2, density functional theory calculations indicate that the Na+ diffusion barrier in the MoSe2 of C@MoSe2@CNT effectively decreases from 0.91 to 0.72 eV, hence promoting the reversibility of the Na+ storage.
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Acknowledgements
This work was supported by the National Natural Science Foundation of China (21725602, 21878071, 21971060). R. Qiu thanks Prof. Nobuaki Kambe of Osaka University, Prof. Ming Zhang and Prof. Hongwen Huang of Hunan University and Prof. Wai-Yeung Wong of Hong Kong Polytechnic University for their helpful discussion. C.T. Au thanks HNU for an adjunct professorship.
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Yang, Y., Wang, F., Chen, Y. et al. Building a PEG-C@MoSe2@CNT heterostructure via in-situ selenidation as highly reversible anodes for Na+ batteries. Sci. China Chem. 66, 475–491 (2023). https://doi.org/10.1007/s11426-022-1416-2
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DOI: https://doi.org/10.1007/s11426-022-1416-2