Abstract
The fine shape control of metal oxides nanocrystal and component are the key for the preparation of high-performance metal oxides/graphene nanocomposites. Herein, a simpler and practicable in situ one-pot approach was used to synthetize α-Fe2O3@reduced graphene oxide (rGO) core–shell nanocomposites. By controlling the amount of hydrazine hydrate and GO in reaction system, the shape of α-Fe2O3 nanocrystals can be tailored from spindle gradually to ellipsoid and quasi-sphere, and the thickness of enwrapped rGO can also be finely controlled. The as-prepared α-Fe2O3@rGO core–shell composites showed much better lithium storage performance than bare α-Fe2O3 nanocrystals. Owing to the core–shell structure and the high conductivity and stability of rGO nanosheet, the quasi-sphere-α-Fe2O3@rGO composites delivered a high reversible specific capacity up to 971 mAh g−1 at the current density of 0.2 A g−1, retaining 530 mA h g−1 at 2 A g−1 and 361 mA h g−1 at 5 A g−1 after 800 cycles with only 0.05% decay per-cycle. Moreover, the facile approach can provide a new strategy for the fabrication of other shape-size dependent, functional, and multicomponent graphene-based composites.
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Acknowledgements
This work was supported by the Nation Natural Science Foundation (Grant No. 51968049) of China, the Youth Science Foundation (Grant No. 20192ACB21031) of Jiangxi Province, China, the Young Talents Training Plan (Grant No. 20192BCB23012) for Scientific and Technological Innovation of Jiangxi Province, China, and the Graduate Innovation Foundation (YC2018009) of Jiangxi Province, China.
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Quan, H., Zeng, W., Pan, M. et al. Controlled synthesis of α-Fe2O3@rGO core–shell nanocomposites as anode for lithium ion batteries. J Mater Sci 56, 664–676 (2021). https://doi.org/10.1007/s10853-020-05215-z
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DOI: https://doi.org/10.1007/s10853-020-05215-z