SnO2@TiO2 Heterojunction Nanostructures for Lithium-Ion Batteries and Self-Powered UV Photodetectors with Improved Performances

Authors

  • Xiaojuan Hou,

    1. Wuhan National Laboratory for Optoelectronics and School of Optical and Electronic Information, Huazhong University of Science and Technology, Wuhan 430074 (China)
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  • Xianfu Wang,

    1. Wuhan National Laboratory for Optoelectronics and School of Optical and Electronic Information, Huazhong University of Science and Technology, Wuhan 430074 (China)
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  • Bin Liu,

    1. Wuhan National Laboratory for Optoelectronics and School of Optical and Electronic Information, Huazhong University of Science and Technology, Wuhan 430074 (China)
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  • Qiufan Wang,

    1. Wuhan National Laboratory for Optoelectronics and School of Optical and Electronic Information, Huazhong University of Science and Technology, Wuhan 430074 (China)
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  • Zhuoran Wang,

    1. Wuhan National Laboratory for Optoelectronics and School of Optical and Electronic Information, Huazhong University of Science and Technology, Wuhan 430074 (China)
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  • Prof. Di Chen,

    Corresponding author
    1. Wuhan National Laboratory for Optoelectronics and School of Optical and Electronic Information, Huazhong University of Science and Technology, Wuhan 430074 (China)
    • Di Chen, Wuhan National Laboratory for Optoelectronics and School of Optical and Electronic Information, Huazhong University of Science and Technology, Wuhan 430074 (China)===

      Guozhen Shen, State Key Laboratory for Superlattices and Microstructures, Institute of Semiconductors, Chinese Academy of Sciences, Beijing 100083 (China)===

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  • Prof. Guozhen Shen

    Corresponding author
    1. State Key Laboratory for Superlattices and Microstructures, Institute of Semiconductors, Chinese Academy of Sciences, Beijing 100083 (China)
    • Di Chen, Wuhan National Laboratory for Optoelectronics and School of Optical and Electronic Information, Huazhong University of Science and Technology, Wuhan 430074 (China)===

      Guozhen Shen, State Key Laboratory for Superlattices and Microstructures, Institute of Semiconductors, Chinese Academy of Sciences, Beijing 100083 (China)===

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Abstract

To overcome the issue of inferior cycling stability and rate capacity for SnO2 anode materials in lithium-ion batteries, an effective strategy is explored to prepare a hybrid material consisting of rutile SnO2 nanoparticles and rutile TiO2 nanorods, considering not only the small lattice mismatch to achieve a better composited lattice structure but also their superior synergistic effect in electrochemical performances. The as-prepared SnO2@TiO2 material, directly formed on a carbon cloth as a binder-free anode, exhibits a reversible capacity of 700 mAh g−1 after 100 discharge/charge cycles at 200 mA g−1, as well as excellent cycling stability and rate capacity. After being calcinated at high temperature, the produced hollow SnO2@TiO2 hybrid microtubes were directly used to fabricate photoelectrochemical (PEC) UV detectors for future devices with self-powered function. A high photocurrent response of 0.1 mA cm−2 was observed, together with an excellent self-powered and fast response and “visible blind” characteristics. Such a hybrid material could achieve a complementary effect in lithium-ion batteries and a superior band gap match in photovoltaic devices, and could consequently be extended to applications such as dye-sensitized solar cells and supercapacitors.

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