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    Porous MXenes enable high performance potassium ion capacitors

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    Name:
    Porous MXenes Enable High Performance Potassium Ion Capacitors-accepted version.pdf
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    1012.Kb
    Format:
    PDF
    Description:
    Accepted manuscript
    Embargo End Date:
    2021-06-12
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    Type
    Article
    Authors
    Ming, Fangwang
    Liang, Hanfeng cc
    Zhang, Wenli cc
    Ming, Jun cc
    Lei, Yongjiu cc
    Emwas, Abdul-Hamid M.
    Alshareef, Husam N. cc
    KAUST Department
    Functional Nanomaterials and Devices Research Group
    Material Science and Engineering Program
    NMR
    Physical Science and Engineering (PSE) Division
    Date
    2019-06-12
    Online Publication Date
    2019-06-12
    Print Publication Date
    2019-08
    Embargo End Date
    2021-06-12
    Permanent link to this record
    http://hdl.handle.net/10754/656414
    
    Metadata
    Show full item record
    Abstract
    High power K+ ion capacitors have great potential in various large-scale applications because of the cost advantages and the low redox potential of K/K+. However, the large ionic radius of potassium brings huge challenges for the development of suitable electrode materials. Here we demonstrate a general strategy for preparing porous MXene electrodes that can significantly enhance K+ storage performance. Using V2C MXene as a model system, we show that the K+ ion storage capacity can be greatly boosted by a simple sequential acid/alkali treatment. The resulting product, K–V2C, not only delivers a capacity of 195 mAh g−1 (in contrast to 98 mAh g−1 of pristine V2C) at 50 mA g−1, but also good rate performance. The charge storage mechanism was carefully studied and is shown to involve a solvent co-intercalation process. In addition, full cells were fabricated by coupling the K–V2C anode and Prussian blue analogous (KxMnFe(CN)6) cathode, which can work at a high average operating voltage of ~3.3 V within a wide range (0.01 V–4.6 V). Moreover, the devices can achieve a high energy density of 145 Wh kg−1 at a power density of 112.6 W kg−1, suggesting that K–V2C, and other porous MXenes prepared by our approach, are promising electrodes in mobile ion capacitors.
    Citation
    Ming, F., Liang, H., Zhang, W., Ming, J., Lei, Y., Emwas, A.-H., & Alshareef, H. N. (2019). Porous MXenes enable high performance potassium ion capacitors. Nano Energy, 62, 853–860. doi:10.1016/j.nanoen.2019.06.013
    Sponsors
    The research reported in this publication was supported by King Abdullah University of Science and Technology (KAUST). Authors thank the Advanced Nanofabrication, Imaging and Characterization Laboratory at KAUST for their excellent support.
    Publisher
    Elsevier BV
    Journal
    Nano Energy
    DOI
    10.1016/j.nanoen.2019.06.013
    Additional Links
    https://linkinghub.elsevier.com/retrieve/pii/S2211285519305178
    ae974a485f413a2113503eed53cd6c53
    10.1016/j.nanoen.2019.06.013
    Scopus Count
    Collections
    Articles; Physical Science and Engineering (PSE) Division; Material Science and Engineering Program

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