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Flexible sodium-ion capacitors boosted by high electrochemically-reactive and structurally-stable Sb2S3 nanowire/Ti3C2Tx MXene film anodes

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Abstract

The rapid development of portable, foldable, and wearable electronic devices requires flexible energy storage systems. Sodium-ion capacitors (SICs) combining the high energy of batteries and the high power of supercapacitors are promising solutions. However, the lack of flexible and durable electrode materials that allow fast and reversible Na+ storage hinders the development of flexible SICs. Herein, we report a high-capacity, free-standing and flexible Sb2S3/Ti3C2Tx composite film for fast and stable sodium storage. In this hybrid nano-architecture, the Sb2S3 nanowires uniformly anchored between Ti3C2Tx nanosheets not only act as sodium storage reservoirs but also pillar the two-dimensional (2D) Ti3C2Tx to form three-dimensional (3D) channels benefiting for electrolyte penetration. Meanwhile, the highly conductive Ti3C2Tx nanosheets provide rapid electron transport pathways, confine the volume expansion of Sb2S3 during sodiation, and restrain the dissolution of discharged sodium polysulfides through physical constraint and chemical absorption. Owing to the synergistic effects of the one-dimensional (1D) Sb2S3 nanowires and 2D MXenes, the resultant composite anodes exhibit outstanding rate performance (553 mAh·g−1 at 2 A·g−1) and cycle stability in sodium-ion batteries. Moreover, the flexible SICs using Sb2S3/Ti3C2Tx anodes and active carbon/reduced graphene oxide (AC/rGO) paper cathodes deliver a superior energy and power density in comparison with previously reported devices, as well as an excellent cycling performance with a high capacity retention of 82.78% after 5,000 cycles. This work sheds light on the design of next-generation low-cost, flexible and fast-charging energy storage devices.

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Acknowledgements

C. Y. W. appreciates the support from a project funded by the Priority Academic Program Development of Jiangsu Higher Education Institutions. G. X. W. and X. G. would like to acknowledge the support by the Australian Research Council (ARC) through the ARC Research Hub for Integrated Energy Storage Solutions (No. IH180100020).

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Authors and Affiliations

  1. Institute for Innovative Materials and Energy, Faculty of Chemistry and Chemical Engineering, Yangzhou University, Yangzhou, 225002, China

    Jian Yang, Tianyi Wang, Xiaoxue Sheng, Jiabao Li & Chengyin Wang

  2. Centre for Clean Energy Technology, School of Mathematics and Physics, Faculty of Science, University of Technology Sydney, Sydney, NSW, 2007, Australia

    Tianyi Wang, Xin Guo & Guoxiu Wang

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  1. Jian Yang
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  3. Xin Guo
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Correspondence to Xin Guo, Chengyin Wang or Guoxiu Wang.

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Flexible sodium-ion capacitors boosted by high electrochemically-reactive and structurally-stable Sb2S3 nanowire/Ti3C2Tx MXene film anodes

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Yang, J., Wang, T., Guo, X. et al. Flexible sodium-ion capacitors boosted by high electrochemically-reactive and structurally-stable Sb2S3 nanowire/Ti3C2Tx MXene film anodes. Nano Res. 16, 5592–5600 (2023). https://doi.org/10.1007/s12274-021-3933-7

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