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FeSb@N-doped carbon quantum dots anchored in 3D porous N-doped carbon with pseudocapacitance effect enabling fast and ultrastable potassium storage

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Abstract

Potassium-ion batteries (PIBs) are promising next-generation energy storage candidates due to abundant resources and low cost. Sb-based materials with high theoretical capacity (660 mAh·g−1) and low working potential are considered as promising anode for PIBs. The remaining challenge is poor stability and slow kinetics. In this work, FeSb@N-doped carbon quantum dots anchored in three-dimensional (3D) porous N-doped carbon (FeSb@C/N⊂3DC/N), a Sb-based material with a particular structure, is designed and constructed by a green salt-template method. As an anode for PIBs, it exhibits extraordinarily high-rate and long-cycle stability (a capacity of 245 mAh·g−1 at 3,080 mA·g−1 after 1,000 cycles). The pseudocapacitance contribution (83%) is demonstrated as the origin of high-rate performance of the FeSb@C/N⊂3DC/N electrode. Furthermore, the potassium storage mechanism in the electrode is systematically investigated through ex-situ characterization techniques including ex-situ transmission electron microscopy (TEM) and X-ray photoelectron spectroscopy (XPS). Overall, this study could provide a useful guidance for future design of high-performance electrode materials for PIBs.

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Acknowledgements

This work was funded by the National Natural Science Foundation of China (Nos. 51661009 and 21875097), the Natural Science Foundation of Guangxi Province (No. 2019GXNSFDA245014), the Science and Technology Base and Talent Special Project of Guangxi Province (No. AD19245162), and the Basic Research Project of the Science and Technology Innovation Commission of Shenzhen (No. JCYJ20200109141640095).

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Authors and Affiliations

  1. School of Materials Science and Engineering & Guangxi Key Laboratory of Information Materials, Guilin University of Electronic Technology, Guilin, 541004, China

    Zhihui Li, Yifan Zhang, Peng Liu, Changhong Xu, Xibing Wu, Yilin Ge, Feng Wang, Qingrong Yao & Jianqiu Deng

  2. Department of Materials Science and Engineering, Guangdong-Hong Kong-Macao Joint Laboratory for Photonic-Thermal-Electrical Energy Materials and Devices, Southern University of Science and Technology, Shenzhen, 518055, China

    Qingmeng Gan, Jing Hu & Zhouguang Lu

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  1. Zhihui Li
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  12. Jianqiu Deng
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Correspondence to Peng Liu, Zhouguang Lu or Jianqiu Deng.

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FeSb@N-doped carbon quantum dots anchored in 3D porous N-doped carbon with pseudocapacitance effect enabling fast and ultrastable potassium storage

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Li, Z., Gan, Q., Zhang, Y. et al. FeSb@N-doped carbon quantum dots anchored in 3D porous N-doped carbon with pseudocapacitance effect enabling fast and ultrastable potassium storage. Nano Res. 15, 217–224 (2022). https://doi.org/10.1007/s12274-021-3462-4

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  • DOI: https://doi.org/10.1007/s12274-021-3462-4

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