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Epitaxial Growth of Branched α-Fe2O3/SnO2 Nano-Heterostructures with Improved Lithium-Ion Battery Performance

Authors

  • Weiwei Zhou,

    1. Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, 637371, Singapore
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  • Chuanwei Cheng,

    1. Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, 637371, Singapore
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  • Jinping Liu,

    1. Institute of Nanoscience and Nanotechnology, Department of Physics, Huazhong Normal University, Wuhan 430079, P. R. China
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  • Yee Yan Tay,

    1. School of Materials Science and Engineering, Nanyang Technological University, 639798, Singapore
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  • Jian Jiang,

    1. Institute of Nanoscience and Nanotechnology, Department of Physics, Huazhong Normal University, Wuhan 430079, P. R. China
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  • Xingtao Jia,

    1. Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, 637371, Singapore
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  • Jixuan Zhang,

    1. Department of Materials Science and Engineering, National University of Singapore, 117576, Singapore
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  • Hao Gong,

    1. Department of Materials Science and Engineering, National University of Singapore, 117576, Singapore
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  • Huey Hoon Hng,

    1. School of Materials Science and Engineering, Nanyang Technological University, 639798, Singapore
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  • Ting Yu,

    Corresponding author
    1. Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, 637371, Singapore
    • Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, 637371, Singapore.
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  • Hong Jin Fan

    Corresponding author
    1. Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, 637371, Singapore
    • Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, 637371, Singapore.
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Abstract

We report the synthesis of a novel branched nano-heterostructure composed of SnO2 nanowire stem and α-Fe2O3 nanorod branches by combining a vapour transport deposition and a facile hydrothermal method. The epitaxial relationship between the branch and stem is investigated by high resolution transmission electron microscopy (HRTEM). The SnO2 nanowire is determined to grow along the [101] direction, enclosed by four side surfaces. The results indicate that distinct crystallographic planes of SnO2 stem can induce different preferential growth directions of secondary nanorod branches, leading to six-fold symmetry rather than four-fold symmetry. Moreover, as a proof-of-concept demonstration of the function, such α-Fe2O3/SnO2 composite material is used as a lithium-ion batteries (LIBs) anode material. Low initial irreversible loss and high reversible capacity are demonstrated, in comparison to both single components. The synergetic effect exerted by SnO2 and α-Fe2O3 as well as the unique branched structure are probably responsible for the enhanced performance.

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